#258

[@jon_raymond]

Gets new knives, immediately cuts himself, continues on with the video, zero wiffy's given.

[@o0julek0o]

Gets new knife. 1:47 - not cut. 1:50 - cut. DEFINITELY A GOOD KNIFE!

[@GlowingCrystalGirl]

1:47 left middle finger NOT cut.... 1:50 left middle finger CUT - what happened !

[@sfaunl]

Proof that knife is really sharp :D

[@MickMake]

Ha ha!

[@MickMake]

Actually, i have no idea what I did it on. That happens often with me, I’ll suddenly find I’ve cut myself on something.

[@rraymakers]

@@MickMake I suspect a clipped cable tie, next Patreon gift: a cable tie gun

[@haardkaar]

@@2000jago There's a tonne of videos on youtube about the Mora knives. Seems to be popular with the bushcraft community. Try to abuse it and cut paper to see if it held the edge.

[@christopherguy1217]

I can't wait for these products to be ready. I'm already making plans for the low power UPS in my projects.

[@MickMake]

Thanks mate.

[@NovaspiritTech]

Awesome stuff u got going on there buddy! I'm excited to see it all cpmpleted

[@MickMake]

Hey mate. Yup, a busy time. So many things planned for this year!

[@hariseldon2577]

wow...just in time!

[@jimcny3]

Andreas Spiess might have an extra set of gloves you can wear now.

[@DirtyboxersNet]

Any updates on the pi projector project? Just stumbled across it, and sounds epic!

[@tinghwazintimbani2414]

Can you use any PCB for the Pi Projector ? Thanks Mick and Merry Christmas.

[@charlesprogrammr642]

What's for supper? I see you have a tv on the stove. :)

[@unlost117]

Hi Mick thats nice work there. Excellent work actually. What ver of Eagle are you using to develop these. How much is it? Cheers. Mick.

[@MickMake]

I’m using the free version, which does limit things somewhat. Although I am tempted to “upgrade” to the full version. However, I’ll look at kicad before I actually take the plunge.

[@dogshome7110]

I've been using the Pi projector at work with some success. Anybody got an improvement on Blutak for holding the focus?

[@MickMake]

Wait for Rev3! It’ll have servo controlled focus.

[@bonnome2]

For the raspberry pi projector, isn't there enough space to reroute the USB port of the pi zero? Similar to how the pi zero "USB-A addon board" works

[@MickMake]

Yes, I was thinking of that, but it'd require another PCB shim with soldering etc.

[@TimothyChapman]

Do you do all the soldering manually or do you have equipment that does it for you?

[@MickMake]

Reflow soldering is the way to go with SMD components. Really the only way when making several boards.

[@TimothyChapman]

@@MickMake Interesting.

[@avejst]

Nice mail... Thanks for sharing :-)

[@amassng3146]

Can we use the DLP471TP?

[@tuttocrafting]

Quick note about the mipi csi connector on rpi. AFIK the mipi interface is handled by the videocore 4. The ISP initialize the interface and have built-in filters for the color correction and lens geometry. I actually don't know if there is a way to directly read the CSI data like the DSI interface using a Arm side driver. You should take a look to the raspiraw project looks like that they managed to access the csi directly.

[@MickMake]

Yes, I noticed that with the Pi MIPI-CSI, but some people have managed to get it going. So looks promising.

[@tuttocrafting]

@@MickMake yup I checked. Someone should have implemented a v4l layer. Take a look on that project on GitHub. In one of the repository on the same guy there is a working sample for HDMI capture on rpi.

[@dalehorton7748]

Theres been a lot of work around the TC358743 for HDMI input to the RPI, with support for it being added to uv4l-raspicam around 2 years ago. Would love to know mick's reasoning for going with the less supported but functionally quite similar TC358749, unless he just wasn't aware of it.

[@MickMake]

There's three different Toshiba bridges, TC358743, TC358746 & TC358749. There is a small amount of difference between the three - EG TDM audio interface, IR, video processing, etc. I haven't had a chance to really look into all three, but if there has been a lot of software work done on one of them, it becomes naturally attractive.

[@spencerchun2360]

Mick, Looking forward to your UPS board if it does what I think it does. Right now I got the Pi Projector working and it is great. Right now, I have the screen saver on the LibreELEC OS to randomly and continuously project the stored photos on the SD card. This makes for a really cool "night light" for the baby room. Since is self contained, runs off a USB battery, it can be aimed just about anywhere the baby room. If your UPS can control the power based on time that is the next thing I am adding!!! After that, UPS time control and motion sensor mode so it only turns on when an adult is in the baby room at night! By the way, I configured the protector with the TI board on top, followed by your board and the pi zero on bottom (component side down ) so I can reach the pi connectors. thanks!!

[@MickMake]

Hi Spencer. Yup you posted in MickMake forums on this. There are several ways of still being able to use the Pi from underneath in the current 1.3 design, but quite a few people started to experience noise from long headers, etc. So, it needed to be fixed. And since it'll also have servo controlled auto-focus, you'll be able to point it vertical and still have it in focus. I'm thinking of adding in a line-of-site distance sensor to provide auto-focus.

[@spencerchun2360]

@@MickMake Just for the sake of discussion and to provide you with some data points. The distance between your board and the circuit side (upside mounting of the pi) is the same as the default middle standoff that came with the DLP board. I took the longer standoffs from the DLP board to use that for feet for the pi zero.. for now. I don't see any noise that affects the video, but I do get the occasion where WiFi does not automatically come up, just cycling power usually get it working. In my case since it is not a big issue, as the "things" is a picture project from on board files. I do however need the wifi to kick off sideshow of stored videos. I can't tell if the wifi is having problems or care for this application. I been able to download pictures, videos and stream material (Kodi) thru the wifi. Another FYI is that for the current version of hardware/software for Pi Zero, bluetooth is not working. Many people have noted this on other forums. Hence (for me), I won't be using it as a full media center (and don't care) since there is no audio , but it is still pretty cool as a standalone system. As for the UPS, for my situation (and hardly anyone else) it would be preferable that the the power on/off can be controlled by just a ambient light sensor, so when it becomes dark the UPS powers up my "night light" and powers down when it is daylight. Naturally, I would have position the sensor such that powering itself on don't simulate daytime. The same for a motion sensor as well, if UPS board could run a motion sensor and enable power (until the room goes quite... or dark and occupied) it would be perfect just for this project. Since I'm running LibreELEC/Kod (single functionality and no keyboard mouse inputs), it is very hard for me to control external devices motion sensor, light sensor or configure a external timer. However, for general Raspbian system it absolute sense to have the Pi drive and control the stuff on your UPS. As for the auto focus, it that could be done independent of the Pi that would most excellent!!! Right now, I use a piece of tape to get the slide some friction and hold the focus when projecting vertically. thanks again for all the excellent design and effort!!!

[@MickMake]

Thanks mate. Yup, I was going to add extra GPIOs to the PiProjector, but figured that it’d be better if I provide the capability to add hats. This way people can mix and match whatever they want; motor controllers, sensors, etc.

[@Mrjarnould]

@@MickMake "line-of-site distance sensor to provide auto-focus" 😍I was planning on doing that myself

[@jasonmhite]

Any reason you didn't run the ATTiny at 3.3V instead of 5V for the Pi UPS? Is it because you're powering it directly from the battery?

[@MickMake]

Yup, I'm running the ATtiny directly off the LiPo. So that means that the board won't function without a LiPo battery installed. I figured that this is more of a safety feature than an annoyance.

[@pfeerick]

@@MickMake Guessing it also makes it a tad easier to interface with the rPi, as the logic levels would be the same. As well as having the benefit of just slightly lower power consumption. Also looking forward to seeing more of this... sounds like it will be perfect for keeping some sensor hub projects running in the event of a power outage, assuming it isn't for too long.

[@MickMake]

Actually I'm still having to use BSS138s for logic level conversion for the I2C bus to the Pi. Pis don't like being shoved 5v on the GPIOs, but they can control 5v logic.

[@pfeerick]

MickMake ... But they probably handle it better than an ESP8266 given 12v on the I/o pins... Yeah, I did that last night... magic smoke genie paid me a visit :-O That'll teach me to mis connect the power and I2C connections on the board! xD

[@MickMake]

Ha ha. Been there several times and know how frustrating it can be when you’re in the middle of something and have no spares.

[@freeelectron8261]

Didn't realize you made pi shields - cool!

[@markcremer3954]

If You cut you finger and then to deep in to the cable use this.....Jokari Cable Knife No 27 T10270

[@oswaldjh]

4:39 Got a little too enthusiastic with your new box openers?

[@RichardT2112]

Yikes! Seems you’ve been practicing with that box cutter on the back of your left hand !

[@MickMake]

Ha ha. No idea how that happened.

[@373323]

aaaah, you cut your hand, i almost passed out seeing it.

[@clangerbasher]

For those who want to know the make of the knives........ morakniv.se/en/product-category/all-knives/utility-knives/electricians-knives/

[@MickMake]

Ah yes. A should have added in a link to those! Thanks.

[@penguin1714]

I'm not a frequent viewer, but I am subscribed and I watch your stuff every now and then. Do you write drivers for these addons? I'm trying to learn kernel driver development, and I'm curious to know if (for things like the RTC especially) you compile these as kernel modules and make debian packages to install them as such or if you do it another way.

[@sfaunl]

I'm also curious

[@tuttocrafting]

Most chips have drivers already written by someone else. Unless you're going to write a driver for a new chip.

[@sethrd999]

If you want to learn to write kernel drivers, 1) just go grab the source ( Linus Branch ) 2) go over the documentation in there ( there is quite a bit ) 3) Be proficient in C other resources, www.apriorit.com/dev-blog/195-simple-driver-for-linux-os freesoftwaremagazine.com/articles/drivers_linux/ Plenty of kernel books on Amazon ( used / like new ) to cover everything else..

[@MickMake]

It's been a long time since I was hacking around with kernel drivers, but I won't need it for the wyrks-UPS and user-land drivers will be good enough... at least at first. Although it'd be nice to have the UPS monitoring in kernel. As others have mentioned... there's plenty of OSS drivers already written and is the case for the RTC, (chose that IC specifically). If you want, I can publish a short video on kernel drivers... Maybe continue my LinuxFu video series with it.

[@penguin1714]

@@sethrd999 Thanks

[@electronic7979]

👍👍👍

[@freeelectron8261]

Bad acting, good engineering :)

[@MickMake]

:-) Sometimes it's the other way around.

[@PhilippBlum]

Shit I did not took the 20% off. Mhmm, paid 7 EUR. OMG! :D No, still a fair price.

[@ianide2480]

But... the Attiny can use 3.3V easily

[@MickMake]

Yes, but since the ATtiny is controlling the charger and DC buck converter, it has to be powered from LiPo. Otherwise if it switches off the DC buck, it'll power itself down.

[@ianide2480]

@@MickMake - Since I don't have a complete view of the schematic I don't spose I can comment to much more, though I do think there would be a way to make it work without a logic level shift. This would likely entail other circuitry, so it could turn into a "6 of 1, half dozen of another" type of situation. No criticism meant in any way was just thinking out-loud. In my own testing I've found that just a 3.3v zener is capable of powering an attiny so a full on regulator isn't "needed" but there are losses involved. etc so on, and hell, it's your design (again just thinking outloud).

[@MickMake]

No, don't apologize. As you said engineering has so many ways of doing things and so many pros and cons. I'm always up for different ways of doing things. The decision ordering in these designs is: 1. ULP. 2. Reduce cost. 3. Reducing the number of different components. 4. Added functionality. I wanted to be able to have the RTC and ATtiny tick over solely on battery. Ultimately, I should be able to get rid of the RTC and use the inbuilt RTC on the ATtiny, but added it in for testing. I should expect to be running on no more than 10uA in ULP mode, maybe less... Hopefully. So, the less components sucking up quiescent currents the better.

[@ianide2480]

@@MickMake Are you using the attiny PWM to control switching of the buck regulator? I've often wondered if the freq was high enough and if it can respond fast enough to feedback but never really looked into it. That and I don't have a ton of knowledge when it comes to switching regulators and their requirements. I don't suppose it would would need to be "super" stable in a charge circuit though. I do know that the built in oscillator is kind of umm, well it's not overly effective at keeping time really well. The drift can be enormous over an 8 hr period of time. I've measured as much as 45 mins of drift (that's what I call ugly anyway), but this may have had something to do with the power supply. It wasn't critical so I didn't care enough to investigate.

[@MickMake]

Yup, I'm concerned about drift, considering that people expect it to be able to keep reasonable time, (IE: seconds in a week at least), So we'll see... I may or may not be able to get rid of the RTC.

[@tenminutetokyo2643]

DOOD!