#292

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Andreas Spiess

Andreas Spiess

Күн бұрын

Пікірлер: 245
@gustavfenk4021
@gustavfenk4021 5 жыл бұрын
In my experience, rain and fog do attenuate wifi signals quite a lot. Both wifi and microwave ovens use frequencies around 2.4 GHz. Maybe that is the clue? Microwave ovens heat the water in food, so water must absorb radio energy very well at that frequency.
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
My actual experience as a wireless ISP is that your suggestion is not correct.
@EsotericArctos
@EsotericArctos 5 жыл бұрын
I have to admit I have found Rain and Fog to affect WiFi in general, but not to a huge extent at 2.4GHz. Mainly in higher frequencies.
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
@@EsotericArctos I run 2.4 and 5.8GHz long range outdoor networks, and I've never seen even torrential rain cause any problems.
@Roobotics
@Roobotics 5 жыл бұрын
@@SteveWrightNZ If you designed your pathways with good RX\TX and they don't failed in rain, that's not empirical evidence that H20 molecules don't absorb 2.4Ghz RF. Because they do, therefore 2.4Ghz is attenuated, that doesn't mean your link will just drop. RSSI values just become lower.
@gustavfenk
@gustavfenk 5 жыл бұрын
My experience is that I have been using a flat panel wifi antenna to connect to a free public hotspot in a building some distance from my flat. At the best of times the connection can be a little slow but useable. In rain and fog it does not work at all.
@commonmogoreanu7135
@commonmogoreanu7135 5 жыл бұрын
Don't listen to those who seek to control your language. The intent behind the words ought to be important.
@einars899
@einars899 5 жыл бұрын
6:40 When considering the Fresnel zone this location is line of sight (light) but still not good for RF communication with trees and power lines inside the Fresnel zone. And the helix antenna is circular polarity and will have significant polarization loss against a vertically polarized antenna.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right about both facts. So far I never used circular polarized antennas. I have to investigate a little more into this matter.
@AkawichPonIn
@AkawichPonIn 5 жыл бұрын
@@AndreasSpiessYou should be lost at least -3DB for using a circularly polarized antenna with a vertical antenna. I would recommend you to use a parabola antenna to get a higher gain.
@AndrewBeals
@AndrewBeals 5 жыл бұрын
@@AndreasSpiess I noticed you running cross-polarized antennas in your LoRaWAN distance tests starting with your gateway having a antenna that was 10° off vertical. This is something to avoid that is emphasized in the ARRL's educational literature as you'll lose 20dB when you use orthogonally polarized antennae. www.mtiwe.com/?CategoryID=353&ArticleID=163
@einars899
@einars899 5 жыл бұрын
​@@AkawichPonIn The circular polarized is actually not a bad choice. Just because it attenuates any linear polarized signals (or noise) by 3dB or more. And most noise, WiFi and Bluetooth is linear polarized. But of course you need the "partner" to be polarized in the same twist. 73 de LA8BKA
@pulesjet
@pulesjet 5 жыл бұрын
Attempting to obtain useful WiFi service from home to town. Approx 2 miles. Lots of useful information for me in this video. Thank You Sir !
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Should be possible.
@cfeigel
@cfeigel 5 жыл бұрын
Nicely done! That was a lot of work. Long range mode is a little disappointing, I was hoping for better. Well, these things advance in small steps. Thanks for sharing your results.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Sometimes also less than expected results are interesting because maybe it saves time.
@NullByteWHT
@NullByteWHT 5 жыл бұрын
This channel is wonderful
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you!
@abdurahimsalsalani7108
@abdurahimsalsalani7108 3 жыл бұрын
Wow nullbyte watching you
3 жыл бұрын
nullbyte your wonderful, thanks for teaching me so much
@philoso377
@philoso377 5 жыл бұрын
Follow my prior comment : Wind usually associate with rain but fog. Antenna set in vibration in windy day, rain or shine, can make matter worse, with unwanted amplitude modulation that convoluting the wanted signal by a vibration magnitude and rate. I agree with other commentator that flat antenna in video has feed port point sideways but downward. Can contribute 3 to 20dB polar mismatch loss to a linear antenna at the far end.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you for your information!
@jedandecko5585
@jedandecko5585 5 жыл бұрын
Weather is a problem f of water is 2.4 GHz, so trees and rain/for are a big no :) also try pringles and yagi antenna. Back in a days, around 16 years ago we manage to make stabile links with WiFi antenna made with satellite dish and yagi inside dish, we manage to reach 5-6 km in city and more than 30 km outside urban areas with Ateros chips since you can go a little outside regular WiFi freq. :) not so legal but it works :)
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you for your info. Of course I also had some „outside legal“ ideas;-)
@simfungreek
@simfungreek 5 жыл бұрын
I think you can improve the RSSI values if you use the same polarization in both transmitting and receiving antennas. I noticed that the panel antenna on the pole is using vertical polarization in contrary to the panel antenna inside the car which is using horizontal.
@WacKEDmaN
@WacKEDmaN 5 жыл бұрын
yup theres atleast a 3dB loss there ... RX and TX antennas should ideally be identical, both in dimensions and orientation..mixing horizontal with vertical and circular is very bad practice!..(even upto 30dB loss when mixing circular with horizontal or vertical)
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
@WacKEDmaN Are you sure about the 30 dB? I also had 3 dB in mind if polarization does not match.
@johnossi4234
@johnossi4234 5 жыл бұрын
@@AndreasSpiess 3dB is the loss from circular to linear. Linear Vertical to horizontal losses are greater. see www.antenna-theory.com/basics/polarization.php
@mrlazda
@mrlazda Жыл бұрын
​@AndreasSpiess if you have a polarization mismatch of 90 (270) degrees in theory, you will have infinite losses, in practice is between 25dB and 30dB. 3dB losses is if mismatch is 45 (135, 225, 315) degress or if you use combination of linear and circular polarizated antenna.
@ChrisMuncy
@ChrisMuncy 5 жыл бұрын
THanks Andreas. I really loved these last 2 videos and hope you do more follow-up.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
We will see. I want to keep the channel open for different topics.
@0104743
@0104743 5 жыл бұрын
Patch Antennas were not located correctly! This can be seen on video 7:45 and 6:55. The fact is that the patch antennas have a clear vertical or horizontal polarization. The spiral antenna has circular polarization. Therefore, for a spiral antenna, it does not matter what position it is in. For the Antenna patch, it is important that the cable goes down both on the transmitting antenna and on the receiving antenna.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I wondered which polarization the patch antennas have. Now I know. Thank you. AFAIK the loss of a wrong polarization is 3dB.
@johnossi4234
@johnossi4234 5 жыл бұрын
Just because the patch antennas appear to exist in two dimensions, it does not mean that they exhibit only linear polarizations. Patch antennas can be fed in a manner that produces circular polarization. If a single patch is fed from the side it is usually linear. If fed into the patch directly to a point inside the perimeter it can produce circular polarization. Many panel antennas are actually 2-4 patches which may individually be linear polarized but phased to produce circular pol.
@lluisllimargas2637
@lluisllimargas2637 5 жыл бұрын
"Unoficially sponsored by Swiss Tourism Office" ha ha. Excellent Mr. Spiess.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I did not see any cash :-(
@lluisllimargas2637
@lluisllimargas2637 5 жыл бұрын
By the way, may I suggest an alternative to the box? Blue Ikea bags are cheap, robust and lightweight, and once folded takes no space. When I worked as a field technician used it to transport up to 15 Kg. Can be handled using only one hand or carried in the shoulder. And in several occasions used them as a cover under the rain (they are waterproof).
@r1273m
@r1273m 5 жыл бұрын
Your tool basket had two items missing, a flask of coffee and a Toblerone! Bob
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right. Or a beer in summer!
@EsotericArctos
@EsotericArctos 5 жыл бұрын
Another great video. I look forward to the "Mystery" video 😊
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Not planned yet :-(
@EsotericArctos
@EsotericArctos 5 жыл бұрын
@@AndreasSpiess I will be looking forward to whatever comes next then 😊
@andresvargas1504
@andresvargas1504 4 жыл бұрын
This info and your experiment results will be very helpful to my degree's project thank you very much bro!
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
Glad it was helpful!
@springwoodcottage4248
@springwoodcottage4248 5 жыл бұрын
Bravo! Such a great series of tests that for someone who knows little about radio and antennas but who finds the concept of action at a distance fascinating, were both useful and interesting. I have experimented with a commercial Yaggi antenna to connect the IP camera in the stable where i have my pony with my home wifi over a short distance of about 25 m, but although I had a little success it was not reliable, but I have managed to get a connection via the main cable with suitable devices and have given up on the Yaggi for now. However, I may revisit it as I have cabins at over 100 m that it would be useful to have wifi in. Just have to be motivated when i have time, the former easy, the latter not so. Thanks for sharing!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
We all have 24h. The rest is priorities ;-)
@basimhassoun2147
@basimhassoun2147 5 жыл бұрын
it has been said before, dear Mr.Andreas is an amazing MADLAD!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you!
@WacKEDmaN
@WacKEDmaN 5 жыл бұрын
Nice Video Andreas, but i think youre missing a major key to antennas...Polarization... youre mixing horizontal with both vertical and circular polarization... there can be upto 30dB loss between horizontal/vertical to circular...and about 3dB loss between horizontal and vertical...you should be using the same antenna (dimensions and polarization) on both the RX and TX sides
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right. I did not consider polarization. I was not aware of the 30 dB. I was aware of the 3 dB between horizontal and vertical. But with all my tests I was not able to see big differences. If circular is so different I have to look into it. Also which polarization a panel antenna has
@Bill-v650
@Bill-v650 5 жыл бұрын
+1 I came down here to say this too. I think H-V cross polarization is a 20dB loss though. I think circular to linear is 3dB.
@Danielwhitney2020
@Danielwhitney2020 5 жыл бұрын
I have definitely noticed that the rain will not allow my esp8266 to send out the temperature from my chicken coop which is a good distance form my access point. Great video, as always very interesting!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Good to know. Thank you!
@ManuKrishnanmagz
@ManuKrishnanmagz 5 жыл бұрын
Thanks for the video, waiting for next Sunday.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
The next video is already nearly finished...
@LarryKapp1
@LarryKapp1 5 жыл бұрын
I use an outdoor square type 2.4 GHz patch antenna for regular wifi to get it from remote router. I am always surprised that it works just as well even if there is torrential heavy rain or snow storm. The thing that has effected the signal the most was a heavy dew on tree leaves when the sun is at a low angle when coming up in the morning. But soon as the sun rises higher the wifi signal would come back okay. There are some hams in town near here using Aredn Mesh firmware in routers that are capable . On the ham bands certain frequencies are in standard wifi ranges so it allows the use of much higher power if someone wants to. I haven't gotten around to trying it out yet.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I can imagine that wet leaves are a reasonable ground quite high in the air. But good to know that fog is no problem. And I also read about these mesh networks, but never tried it myself.
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
Good fun Andreas!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Yes. Better weather would have increased it a little ;-)
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
@@AndreasSpiess It's always an adventure in the rain! :)
@provvisorio100
@provvisorio100 Жыл бұрын
you are a real swiss genius!
@AndreasSpiess
@AndreasSpiess Жыл бұрын
Thank you!
@fluidefluide1128
@fluidefluide1128 3 жыл бұрын
A place for everything, and everything in it's place. All Hail the Kingdom of Tidy and Just So !
@AndreasSpiess
@AndreasSpiess 3 жыл бұрын
??
@nuduexplore
@nuduexplore 4 жыл бұрын
Could you show us the upload/download speeds (bps) at each distance? would be pretty cool to see.
@precisioncueservice6355
@precisioncueservice6355 3 ай бұрын
We have ancient castles, they are called White Castles and are not in nice places. Tasty burgers!
@DustinWatts
@DustinWatts 5 жыл бұрын
Thanks for part 2 Andreas!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are welcome!
@VincentFischer
@VincentFischer 5 жыл бұрын
there is a great parametric design of a helicalantenna on thingyverse. using it for 5.8ghz video and outperforms any antennas I have bought that advertise same specs and is even quite rigid (the death of my self build helicals with cardboard was always because i threw them in a backpack and the copper wire deformed. not so with the design from thingyverse)
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Sounds interesting. Do you have a link?
@VincentFischer
@VincentFischer 5 жыл бұрын
@@AndreasSpiess hi andreas, sure! its thingiverse.com/thing:2497461
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you!
@jimsonweed1846
@jimsonweed1846 5 жыл бұрын
Patch antenna (esp32 has it too) have linear polarisation but Helix is circular polarized. It is at least 3 db loss.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right. It was ok for me in this situation. Next time I probably build two helical ;-)
@pranjal3727
@pranjal3727 4 жыл бұрын
Z=140xC/Lambda Now, to get a standing wave axial type helical antenna we want C=lambda. Which means were pretty much stuck with a 140ohm antenna. Now i don't how how it will affect beam forming or matching but using three perfect helical antenna with a matched 50ohm cable will give 140/3 roughly 50 ohm to get work done.
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
You have to adapt it to 50 ohms before the cable. It is done by the small triangular copper plate. I did not look into how it works.
@avejst
@avejst 5 жыл бұрын
Interesting as always 👍 Great video as always Thanks for sharing 👍😀
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are welcome!
@jameymcpherson7631
@jameymcpherson7631 4 жыл бұрын
I am new to projects like this. I dream about making a portable transmitter/receiver for the common signal types like cellular, GPS, WiFi, bluetooth ANT+ and wonder what it would look like to make the form factor ideal for the antennas and portability. My thought is that it might be a good experiment to consider tethering various devices from such an antenna hub based on the contexts that you would use them instead of trying to continue to pretend that cellphones are good for everything. I could use advice on what direction to head to get the supplies and skills I need. Thank you for your excellent videos.
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
Maybe you start with one after the other? This is a huge project.
@TheDefpom
@TheDefpom 5 жыл бұрын
Your patch antenna in your test was facing downwards slightly , did you check radiation polarisation?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I saw that too. Bad mounting and some wind. The opening still should have been enough. For sure I lost a dB or so.
@juststeve5542
@juststeve5542 5 жыл бұрын
Very interesting... I look forward to your further investigations. I haven't really played about with antenna construction much since the CB days, which being 27Mhz involved somewhat larger (impractical) engineering! I wouldn't worry about political correctness, it's gone mad. People who just hear words but ignore context are just revealing their own inner issues. Thomas Sanladerer, the 3D printing guy, was stumbling all over this on a video about SPI, and the meaning of the MISO and MOSI acronyms, causing much amusement in the comments.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Yea, 27MHz antennas are big! This microwave stuff is much handier...
@wangouthangout
@wangouthangout 4 жыл бұрын
Was he talking about sketches called 'master' and 'slave'?
@ferencszabo3504
@ferencszabo3504 5 жыл бұрын
Hi, can i ask one question Herr Spiess? I'm searching for some kind of power on reset device for esp8266, so if my solar weatherstation falls out because the overnight drained battery, when reaches again safe voltages it resets the esp! Thanks
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You can search for voltage monitor IC (e.g. TPS3839) These keep the reset pin low as long as not enough voltage is available.
@VARocketry
@VARocketry 4 жыл бұрын
Question: Does usable range imply both Signal from Site A can be received at Site B AND that it can receive signal from devices at Site B trying to communicate back to Site A? I moved to the beach recently. I’d like to extend WiFi coverage approximately 250 feet to the beach . I do have direct LOS from second story of house to desired area of beach about 250 feet. I’d like 5gig coverage for iPhone and laptops. If a long range Access Point states its service is usable at 300 METERS, 1) that seems more than enough and 2) does that imply that Iphone and Laptop device's WiFi signal can be received by that LR Access Point?
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
I strongly suggest watching this channel: kzbin.info/door/HqwzhcFOsoFFh33Uy8rAgQ He has plenty of stuff for your use case.
@dmitrysergeenko804
@dmitrysergeenko804 5 жыл бұрын
Hello! Really like your videos. But you need to do something with the microphone cable, probably change it to shielded, when you watch your video in the headphones in the left channel, you can constantly hear background noise from the computer or something else. Thanks for the videos!
@guntherschadow9383
@guntherschadow9383 Ай бұрын
Gruezi. What do you think of the crude methods to add an external antenna to an ESP devboard v1 that only has a PCB antenna? Is there any chance to tinker with it such that we can match the impedance properly?
@AndreasSpiess
@AndreasSpiess Ай бұрын
O would not try it unless you are good in RF design and have the necessary instrument because you can buy boards with antenna connectors.
@tailerbrown6825
@tailerbrown6825 5 жыл бұрын
Swiss humor detected 3:43
@zmeygavrilych
@zmeygavrilych 5 жыл бұрын
I thought it was at 5:11 ;)
@EsotericArctos
@EsotericArctos 5 жыл бұрын
@@zmeygavrilych I think it was at both points 😊
@jaynottelling5892
@jaynottelling5892 5 жыл бұрын
Can we get a sensor for that?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
The sensor is the viewer's comments. Always nice to read!
@jaynottelling5892
@jaynottelling5892 5 жыл бұрын
From an 'easy usage' point of view, it would be nice if they came pre calibrated. But as a viewer, no way am I submitting myself to calibration. I'm also glad they come in different pin configs too. 😁
@SurajGrewal
@SurajGrewal 5 жыл бұрын
Microwave oven also uses the same frequency, thus we can imply, water absorbs 2.4ghz quite well
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right with the microwave. But other viewers reported different results with fog.
@medoaboali1001
@medoaboali1001 5 жыл бұрын
Egypt has great weather to experiments we tried at 5km in sight also !!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Of course, you have good weather! Maybe a little hor for me ;-)
@joshuarosen6242
@joshuarosen6242 4 жыл бұрын
Did it work? Did you achieve a 5km range?
@magnetiseur77
@magnetiseur77 5 жыл бұрын
Hi Andreas. Did you care about the antenna polarization ? If your antennas are not with the good one there are big losses. As example: using two different linear polarization, there is 20dB of attenuation. As you use circular polarization, and if I remember my radioamateur experience, you must use one right hand and one left hand polarization. In an other way, it is not because an antenna has a good VSWR proove that is a good antenna (see VSWR with a dummy load). Hope this could help. regards F1SLU
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right. I know about polarization, but never exprienced huge losses or wins on these high frequencies. And very often you cannot match porarization if the devices move (e.g. smartphones). I always thought the loss between horizontal and vertical polarization is 3dB. But I did no research.
@philoso377
@philoso377 5 жыл бұрын
Andreas Spiess Theoretically, line of sight reflection free polarization mismatch of perfectly linear polarized antennas can be infinite loss and not 3dB. Practically antenna system imperfection, imperfect linear polarized and stray reflectors may contribute cross polarizations allows an infinite loss to be finite loss. A polarization mismatch link between linear and circular antennas in free space is expected to be -3dB.
@magnetiseur77
@magnetiseur77 5 жыл бұрын
@@AndreasSpiess It's 20dB. between circular and linear it's 3 (or 6 I do not remember !) dB
@cheaterman49
@cheaterman49 3 жыл бұрын
Hi Andreas thanks for the great video as usual! If I'm not mistaken, you didn't yet investigate further the difference between your homemade antenna and the commercial one? In case I am incorrect, can you please provide the link to this "mystery video"? Thank you! :-)
@AndreasSpiess
@AndreasSpiess 3 жыл бұрын
I did no further work on the topic
@cheaterman49
@cheaterman49 3 жыл бұрын
@@AndreasSpiess Thanks for answering :-) I hope you will eventually find the time and/or interest to revisit this, it's very interesting in my opinion!
@duncanx99
@duncanx99 5 жыл бұрын
Is there any chance of producing a comparison of commercially available stub and whip antennas? I remember from earlier videos that some Chinese antennas were tuned to the wrong frequency and one or two were OK on 2.4GHz. I need to mount some ESPs, via uFL to SMA, in metal boxes and I need to find usable antennas for them. Thanks
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
The dealers on Aliexpress change their suppliers quite often. So it would make no sense. The only thing you can do is measure yourself. Or by from trusted suppliers. Sometimes even two antennas of the same packet are different.
@D9ID9I
@D9ID9I 3 жыл бұрын
Is that possible to load all channels in 2.4 Ghz with ESP32 or 8266? To block bluetooth boom boxes in area for example.
@perry6466
@perry6466 3 жыл бұрын
Servus! Du, was ist mit den 2,4 GHz Lora Modulen geworden ? Das wäre ein Interresantes Thema, auch für Datenübertragung möglich ? Schaue immer gerne wieder rein ;)
@AndreasSpiess
@AndreasSpiess 3 жыл бұрын
Datenübertragung ist sicher möglich mit diesen Modulen. Im Moment liegen sie immer noch in einer Box...
@perry6466
@perry6466 3 жыл бұрын
@@AndreasSpiess Es gäbe auch einen Sateliten (21.07 Launchdate) der 2.4GHz Lora Überträgt. Ich denke aber, das die Übertragung eher schwierig sein kann. Ich finde deine Beiträge immer Ideenreich. DANKE mach weiter so ^^ ich weiss was das für ne hacke ist
@AndreasSpiess
@AndreasSpiess 3 жыл бұрын
Wir haben ja bereits einen Satelliten der auf 2.4 GHz (und 10GHz) arbeitet. Er ist geostationär und heisst QO-100. Du findest Videos wo ich eine Bodenstation gebaut habe...
@mikek3094
@mikek3094 5 жыл бұрын
At 6:40 when you point antenna at your house, there are some power lines in the way. Do you think those decrease or block the signal?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I do not think so. They are only a very small obstacle.
@jadoo16815125390625
@jadoo16815125390625 5 жыл бұрын
Why is the green color of the PCB important? Are other color PCBs made from a different material?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Think if it would have been black ;-)
@faidularcs
@faidularcs 5 жыл бұрын
It's great news 👏👏👏👏👏
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you!
@Max27653
@Max27653 5 жыл бұрын
Hi do you know any solution for transmitting and receiving data low power? eg temperatur data sending and receiver both with a couple of aa batteries? nrf24, rfm95..they all need too much energy in rx mode. I'm searching for over an year now..
@ZillionPrey
@ZillionPrey 5 жыл бұрын
LoraWAN, ZigBee, Z-Wave
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
@max things: DerpyDoom is right
@Max27653
@Max27653 5 жыл бұрын
Really in RX mode and battery powered? As my searching there seems no other solution than a ook receiver. All the chinese stuff, wirelss door bells, thermometers..they all worked with simple ook receivers and many many month with just two mignon cells
@defuliogames9150
@defuliogames9150 Ай бұрын
aumentou cerca de 10x o alcance original, aprovado.
@AndreasSpiess
@AndreasSpiess Ай бұрын
Thank you!
@gertdenneijsel4311
@gertdenneijsel4311 5 жыл бұрын
Did you take the beam width of the antennas into account ? I noticed that the antennas are dangling from the mast. If the beam width only is a few degrees it makes a lot of difference.
@gneijsel
@gneijsel 5 жыл бұрын
I guess the beam width is about 30 degrees. Have a look at the radiation pattern polar plot: www.comsol.com/blogs/analyzing-operating-mode-options-for-helical-antennas/
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I agree my mounting was not ideal and I lost a dB or so due to that fact.
@glennedgar5057
@glennedgar5057 5 жыл бұрын
Short question. If I have an esp32 with an MQTT client with LR configured, is there an easy way to get it to an MQTT server in the cloud. The esp32 access point will be configured in LR mode also. So the esp32 LR appears to form an isolated island. It would seem to require a Bluetooth or serial link to another esp32 in normal mode. Is there a better way
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I did not look into using a ESP32 as a bridge. If you look at the sketches I used you see that the master first connects to a regular AP. So it should be possible to use this one as a bridge.My topic was more the LR mode.
@cheaterman49
@cheaterman49 3 жыл бұрын
3:50 LOL Andreas hahahahaha these jokes are hilarious xD
@AndreasSpiess
@AndreasSpiess 3 жыл бұрын
Thank you!
@digdigger4277
@digdigger4277 5 жыл бұрын
anyone know how to fix a black screen esp8266?
@martinmacko7297
@martinmacko7297 4 жыл бұрын
Hi Andreas, you have lots of experience with ESP32. My ESP32 disconnects irregularly from wifi within 1-2 days always. Did u encounter this issue? What it could be? Many thanks!
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
Unfortunately I cannot do remote debugging. Especially not for sporadic errors :-(
@martinmacko7297
@martinmacko7297 4 жыл бұрын
@@AndreasSpiess Hi I know u cannot debug just was curious if you had this issue with yours esps.
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
No.
@amargupta.8847
@amargupta.8847 5 жыл бұрын
Hii great video. But I have some different issue. I'm getting exemption (9) and board resets. But I don't want it to happen. It's not a big code but I don't want it to restart like that .. I tried adding delay to it but didn't worked.. please help me with this, can't find another person with this kind of depth in esp. Tq in advance..
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Unfortunately I cannot do remote debugging :-(
@amargupta.8847
@amargupta.8847 5 жыл бұрын
@@AndreasSpiess tq for sparing your time.. love from India.
@radiohobbyist13
@radiohobbyist13 5 жыл бұрын
Make sure to point the antenna directly at your head while transmitting. Nothing bad will happen.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
You are right.
@darkstar2111
@darkstar2111 5 жыл бұрын
Hello Everybody! Do you think ESP32 LR or LoRA are good ideas to consider when i'll try to connect my apartament with my basement in multi-occpupied building? I live on 5th floor and basement is on -1. There are many, many layers of reinforced concrete between us :( Any ideass greatly appreciated! Cheers!
@JulianKnight-IT
@JulianKnight-IT 5 жыл бұрын
I think that WiFi is very unlikely to work at all.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I would try Powerline. Here you have at least a change to be successful. LoRa only transfers a few bits per seconds
@JulianKnight-IT
@JulianKnight-IT 5 жыл бұрын
@@AndreasSpiess Possible depends on the country? I think some countries may use 3-phase mains? So it may be hard to find a power outlet in the basement on the same phase as the apartment?
@dd0356
@dd0356 5 жыл бұрын
i bought a powerline (cheap) speed reduces with length of electrical cable. if u have ups/inverters, they cause additional interference. ofcourse, 3-phase wiring means it may not always be successful. best solution till now is to use cat 5/6 cable from the router and add an accesspoint at each floor (concrete has steel reinforcement which eats all the signals, so they don't travel across the floors). But in the case of cat cables, rats don't like them. so these cables need reinforcement (from rats)
@darkstar2111
@darkstar2111 5 жыл бұрын
@@dd0356 I have 3 phases in my apartment, although basement may be connected very separate way. It's 7-story building, with 8 apartaments on each floor :( My last chance is GSM as it works well even underground, but it's additional cost every month to pay pre-paid internet on simcard working there. Thank you for your responses. Cheers!
@ADOConnection
@ADOConnection 5 жыл бұрын
I think the mode comparison was a little unfair by transmitting using different modules, cables and antennas. Interesting results anyway!
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
There was less difference than you think. The transmitters were the same modules. The receiving s ich de was completely the same as I changed the Sketch f oh r the different Tests. The transmitting antennas were different.
@ADOConnection
@ADOConnection 5 жыл бұрын
Ok, got it!
@jimsonweed1846
@jimsonweed1846 4 жыл бұрын
Is not correct, because helix antenna have circular polarization, but patch antenna v-h. That's mean 6 db loss for helix, but thus helix independent for source orientation. Caution, helix create interference for both polarization v and h at the same time.
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
You are right about the loss between vertical and circular antennas. I do know which polarization my patch antenna has. My POTY 2.4GHz patch antenna, for example, is circularly polarized.
@marijnfly
@marijnfly 5 жыл бұрын
Cool. But I just sent a first Hello World message using a NB-IOT network. No need for big antenna's. T-Mobile offers a free sim card to play around with for a year. Maybe you can do a vid about these too.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
If they would start it here for sure would cover it.
@marijnfly
@marijnfly 5 жыл бұрын
@@AndreasSpiess Are you suggesting your area isn't covered yet? I expect my nb-iot device to work if I would bring it over there and plug a battery in. A search on google tells me that Swisscom has completed rollout in Switzerland as per June 2019. Not sure if you can get a free sim to play with. www.digitalkeys.io/nb-iot-network documents.swisscom.com/product/filestore/lib/7247d9ff-14e6-408a-9982-c0589b688912/brosch%C3%BCre_connectivity-en.pdf (page 8)
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I have a colleague who is in close contact with Swisscom to get a module and a SIM card. Unfortunately, the project is shifted and shifted...
@sharpbends
@sharpbends 5 жыл бұрын
Very interesting :-)
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you!
@eriklaken1025
@eriklaken1025 5 жыл бұрын
You can use the mode WiFi On. Or WiFi Off Than your esp can do iT,S Thing and is not in deep sleep. If ... Is true WiFi on and send data.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you for the tip!
@lasersbee
@lasersbee 5 жыл бұрын
What is a jowl meter ?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
It measures Energy used by devices.
@Brutaltronics
@Brutaltronics 5 жыл бұрын
3:45 that's what she said! oh man, sorry i had to.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
:-))
@charliemopps4926
@charliemopps4926 Жыл бұрын
I think the effort to reduce the use of the possibly offensive terms "Master" and "Slave" is mostly centered around IS orgs in countries with a fairly recent histories of a race based slave trade... i.e. the United States. I know that my employer has done their best to reduce the use of the terms and, frankly, I don't think any of us really care. It's not that hard to use alternative terms like Server/client or Primary/Secondary, whatever... and if it makes one or two people I work with feel a bit more comfortable, why not? I'm in a mixed race family and don't really care, but maybe it annoys someone else?
@EpicLPer
@EpicLPer 5 жыл бұрын
👍
@killrb13
@killrb13 5 жыл бұрын
3:40 that's what she said
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
:-)
@BerndFelsche
@BerndFelsche 5 жыл бұрын
Water abdorbs 2.4GHz www1.lsbu.ac.uk/water/microwave_water.html Airborne droplets will do transmission range no favours at all. 😕 It gets worse with salt spray... Not a problem in Switzerland but worth considering ocean-going or even coastal applications where one might like an RF bridge to a smsll island without Internet.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
That is what I thought. Interesting to bring salt into the equation! Never thought about that.
@TheKuptis
@TheKuptis 8 ай бұрын
5:20 Screw PCness!
@AndreasSpiess
@AndreasSpiess 8 ай бұрын
That was a joke ;-) (Maybe not a good one)
@TheKuptis
@TheKuptis 8 ай бұрын
@@AndreasSpiess Oh. It went over my head then. Sorry.
@PhG1961
@PhG1961 5 жыл бұрын
Great video, however, not really sure what to think of it... longer is better, sometimes thicker is better... political incorrect sketches... Very confusing. One thing I'm sure of... size does matter !
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
For antennas, for sure. And I only talked about antennas in this video.
@PhG1961
@PhG1961 5 жыл бұрын
@@AndreasSpiess Antennas... what else ?!
@TheBodgybrothers
@TheBodgybrothers 5 жыл бұрын
Its all bout the girth
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I thought not everybody can agree ;-)
@dr.marcobobinger5744
@dr.marcobobinger5744 4 жыл бұрын
Hi Andreas, I'm Marco from Bavaria. Thank you for your time and great tutorials. I know this video is related to WiFi transmission but since you are a great fan of LoRa, I'd like to ask you a specific antenna question there: To my knowledge, the ISM regulation in Europe is 14dBm (=25mW). I see a lot of dipole LoRa-antennas with a gain of around 2.1dBi. For a specific project, I'd like a gateway to be able to listen with a long-range antenna. There are a couple of YAGI antennas with gains of 11dBi or even 23dBi available and can be sourced from digikey: www.digikey.de/products/de/rf-if-and-rfid/rf-antennas/875?k=yagi&k=&pkeyword=yagi&sv=0&pv1851=291672&pv1851=299188&sf=0&FV=-8%7C875%2C1850%7C417331%2C1850%7C417333&quantity=&ColumnSort=0&page=1&pageSize=25 Do you think it is possible to connect multiple antennas over one HF port on a LoRa gateway (like the ones from Dragino or RAK). I can imagine that the signals of two antennas could interfere on the one hand. On the other hand, if the 2.1dBi dipole antenna is not receiving much signal and the long-range one is, there's not much to interfere :). What is your opinion about this? How can be ensured that ISM standards are met?
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
It is not easy to connect multiple antennas because all antennas have to be 50 ohms. If you connect 2 of ehm they are only 25 ohms, etc. I also made a video which shows that the antenna is not very important for lora. If you have no line of sight, usually it dows not wôrk. If you have line of singt, it woks up to 700 km and more. Receiving with hi-gain antennas is alllowed. transmitting of course not.
@HashanGayasri
@HashanGayasri 5 жыл бұрын
10km transmission - this is by the guy whose github page is linked in the description. kzbin.info/www/bejne/r3Svk2Wbftl3r6c PS: Interestingly, I was just watching that video just before this one.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I know this video. But I do not know where to get this antenna :-(
@Marco9K
@Marco9K 5 жыл бұрын
First of all I want to thank you for your work and enlightening me and I would like to give you an interesting topic when it comes to long range communication. I came across this doc yesterday dl.acm.org/citation.cfm?id=3345436&preflayout=flat For IoT devices this seems excellent and I am really looking forward to see an actual implementation and maybe even test it myself, maybe something for you to look at as well?
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Thank you for the link. I read the paper. Interesting idea. For me it seams like a niche product. On low data rates it easily could be replaced by LoRa with much better link budget. I also would transmit voltage from time to time to solve the Problemorten knowing if the device has no power.
@andrzejdamianpierzasty8916
@andrzejdamianpierzasty8916 5 жыл бұрын
Helou, very good video, If You Have Andreas this one E32-433T30D Lora Long Range UART SX1278 433mhz 1W, please check them and make test video for us, thank you, Andrzej.
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
1W is probably a little too much for KZbin. I have to stay legal here :-(
@Mazen-dh1yl
@Mazen-dh1yl 4 жыл бұрын
3:56 hahahahaaha
@AndreasSpiess
@AndreasSpiess 4 жыл бұрын
:-)
@redlines2535
@redlines2535 5 жыл бұрын
The mysteri is a bad execution of the diy antenna to solve swr with this trick
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
I do not get your point. Maybe you explain it differently?
@ErikDaGreat
@ErikDaGreat 11 ай бұрын
The political correctness bit was funny
@irineuscherer8289
@irineuscherer8289 5 жыл бұрын
MANDA EM LÍNGUA PORTUGUESA
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
Unfortunately, I do not speak Portuguese
@johnossi4234
@johnossi4234 5 жыл бұрын
Not Politically correct? Was this a joke I missed?
@amciaapple1654
@amciaapple1654 5 жыл бұрын
I think it was something about the RED colored board. Apparently that is the color of communists. I am unclear whether communists have special snowflake status in Sweden. ...or maybe ant-communists get offended at the color. You'd have to ask someone more familiar with Sweden.
@dd0356
@dd0356 5 жыл бұрын
sketch is called master and slave
@Trident7235
@Trident7235 5 жыл бұрын
Please stop to pronounce the word "development" like that. It hurts my ears.
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
Lots of his words are wrong. People who matter don't care about it at all.
@Trident7235
@Trident7235 5 жыл бұрын
@@SteveWrightNZ I know. I don't care about other words. But his "develOpment" is just horrible. And if he learned somehow to do not pronounce "WiFi" as "wify" so he can learn to pronounce correctly the word "development" as well.
@Trident7235
@Trident7235 5 жыл бұрын
@@UnCoolDad According to this stupid "logic" ANY pronunciation is absolutely fine.
@science4allworld587
@science4allworld587 5 жыл бұрын
If we learn foreign language, we will never be able to pronounce like natives. Furthermore our mother tongue affects any new language we learn. He is Swiss.. He speaks some words in German accent, its obvious and ok. Language is mode of communication, if he has managed to communicate what he wants to... then purpose is solved. So focus should be in knowledge he is sharing...FREE for us. If legs n ears hurt of those who don't like few words.. they should put ear buds n rest ;). Great job Andreas... keep going.
@SteveWrightNZ
@SteveWrightNZ 5 жыл бұрын
@@Trident7235 ANY pronounciation IS fine. Go away. I like listening to Andreas, he's very relaxing and a nice fella, and you are not.
@prmajiq
@prmajiq 8 ай бұрын
dont work ............................................................................................ets Jun 8 2016 00:22:57 rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff0030,len:1344 load:0x40078000,len:13964 load:0x40080400,len:3600 entry 0x400805f0 Slave Error = 0 , Mode LR OK! ...........................
@AndreasSpiess
@AndreasSpiess 8 ай бұрын
This project is 6 years old. Maybe you find a newer one...
@electronic7979
@electronic7979 5 жыл бұрын
👍
@AndreasSpiess
@AndreasSpiess 5 жыл бұрын
:-)
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