EEVblog 1644 - Mailbag: CrowView Monitor, Casio Game, 4-20mA Encoder, Wurkkos Battery, Rulerize

More mailbag!
00:00 - Crowview Monitor & Keyboard
www.elecrow.com/crowview-note-all-in-one-portable-monitor-phone-to-laptop-device-with-full-featured-type-c-sbcs-mini-pc-pc-game-console-compatibility.html?idd=5
08:11 - Casio Border Army Game+Watch
11:34 - Minipa ET-1700 Pocket Multimeter
13:24 - Adafruit PCB Ruler
14:14 - PASS Card Game
15:13 - Crusty Raspberry Pi
17:40 - Sinusoid 4-20mA Rotary Encoder
store.sinusoid.com/encoders/encoders-rotary/rotary-encoder-rpe4-8-absolute-analog-4-20ma-output-8mm-shaft.html?
29:29 - Wurkkos H1 USB Battery Bank
s.click.aliexpress.com/e/_DDNAnMH
36:05 - Rulerize, transparent ruler sticker
www.rulerize.com/
Forum: www.eevblog.com/forum/blog/eevblog-1644-mailbag-crowview-monitor-casio-game-4-20ma-encoder-wurkkos-ba/
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#ElectronicsCreators #Mailbag

[@Boffin55]

The crowview seems like the perfect datacentre crash cart item or test bench for desktops; to me. Monitor, keyboard, trackpad. NICE

[@rulerize]

Thanks so much for reviewing the rulerize sticker Dave, appreciate it :)

[@mikeselectricstuff]

14:08 another PCB ruler fail - holes need to be on the edge ( like the Digikey one) for testing component pin sizes.

[@IanScottJohnston]

Back in the 90’s I used to design hardware to interface to 4-20mA signals, the interesting ones being loop powered digital indicators, I.e. they had no separate power, they consumed around 1 or 2mA and therefore the minimum 4mA signal also powered the device. Burr Brown used to have a bunch of different 4-20mA IC’s.

[@tylerlloydboone]

EEVBlog pocket multimeter!? Let’s goooo!

[@_general_error]

make the pcb ruler happen now! ... while I still have money, Dave...

[@edgars53]

Yes, EEVrules!

[@j.f.christ8421]

32:35 is why circlips & snap rings are called "Jesus clips", as in "Jesus, where did that bloody thing go?"

[@johnsonlam]

Package in China may meet all kind of worse scenario: Submerge in rain, throwing on and off truck, squeeze together with all kind of strange things, and finally leaving horrible logistic of China.

[@ankurnaidu]

Just to add. The reason you actually use 4-20mA in Industrial engineering is because when we have a 4mA signal, we know it is LOW and 20mA is HIGH but if it is transmitting 0mA we would know if we have an issue with the connector or if it is broken. if LOW was 0mA, we know not know if the sensor is just transmitting an actual LOW signal or is just broken, Thats the reason it starts at 4mA.

[@mikeselectricstuff]

Also the 4mA minimum guarantees some power for the sensor

[@jarvenpaajani8105]

Also EMI does not cause as high signal error as sensors with voltage output with very high impedance, so you don't usually need shielded cable

[@MetrologieGiraud]

you're right, but 0-20mA are still used. They are used in intrinsec barriere wich transmit information to control room. This scale (0-20mA) is used when high accuracy is need, but comes from a barriere who's supplyied by the main.

[@ankurnaidu]

@@MetrologieGiraud oh, didn't know that

[@SusanPearce_H]

It hails from more than a century ago, with teletype standards.

[@s_s-g4d]

making the power button a regular keyboard button and, furthermore, placing it right next to the home button, must be illegal!

[@s_s-g4d]

but otherwise -- a rare occasion these days! -- they even included the home/end/pgup/pgdn keys, good for them.

[@dgo4490]

They should have left a Pi slot INSIDE the chassis!

[@Bluetank1991]

Woohoo an new mailbag Tuesday 😊

[@EEVblog]

Good enough for Australia.

[@Bluetank1991]

@@EEVblog I'm happy with every mailbag video 🥰 and I'm going to ship somthing to you for a teardown from Germany 😊

[@pulporock]

The Crowview is exactly what I need for my Beelink as well. Cool thanks

[@davidtran4760]

When you unpluged the usb cable and the power bank was already twisted on, the power bank is in discharging mode. In that manual, when you see a green led that indicate that there is 60%-100%.

[@EEVblog]

But it doesn't output anything.

[@davidtran4760]

@@EEVblog only thing you left to try is to charge it in an external charger, but that defeats the purpose of it being a battery bank itself

[@md.mostafakhan4529]

The Raspberry Pi compute module is very thin; if that could be implemented then it would be a really usable computer.

[@J_i_m_]

It's about 15cm long, sticky and you can put it on a whole bunch of stuff 😀

[@EEVblog]

That's what she said.

[@KeritechElectronics]

The "Look Mum, No Computer!" laptop, haha. Hell, the flex cable in that Casio game looks super cool. The whole thing can probably be restored, and I think I figured out how to play it by the look of the controls. Now, it's time for EEVBlog vs Adafruit (vs anyone else willing to participate) Giant PCB Ruler Showdown! Start your engines and may the best drag queen win... oh wait, that was a different show. The flex cable in that Casio game looks super cool, with all the shunts across it. I've never seen that done on old flex PCBs; modern double layer with vias is a different story. The whole handheld game can surely be restored, and I think I figured out how to play it by the look of the controls. I'm sure Sam Battle of LMNC could circuit-bend it into a synth, like anything he touches. Midas had his gold and Sam has his synths, haha. Nice Crustberry Pi 3, it reeeeeeeeally needs that ultrasonic bath. I've used almost all production "B" line 'berries, from model B rev 1 without the mounting holes, to the 4B and also CM4. Absolute position rotary encoder? Oh man, thing of beauty and joy for ever! Might not be the synchro of old (as seen on CuriousMarc!), but still, loveliness. Cute little flashlight, I like the retainer ring. Mechanically it seems built to last and be repairable if you don't mind that silly-cone crap, but the charger pulling shenanigans when new? C'mon... that built-in charger seems to be there for the looks, and you'll just have to do with pulling the battery out and charging it in an external charger. Thumbs down indeed for the lack of basic functionality out of the box, this is just ridiculous. One for discombobulation and the other one, you decide. Interesting transparent rulers. I'd put one on my workbench somewhere.

[@pglick123]

In the good old days we'd call it a terminal. It's actually pretty neat since they don't make terminals anymore.

[@perkulant4629]

Haha, I shoot circlips across the room all the time in work 😅.

[@PaulSteMarie]

Getting the angle for a one bit change is pretty straight forward with a sine bar and some gage blocks. 1/4000 of 5" is . O013 difference in the ends, easy to get an appropriate pair of stacks and a second pair for the 0:1 slope measurement. Seems a waste to send an analog signal when you could just as easily run 4-20mA serial output like an old Teletype. 1 bit of error in the analog output is only 3 μA.

[@danielfinegan6107]

with flashlights you need to polish the aluminum contacts on a paper towel , lots of black stuff comes off , maybe measure the battery with multi-meter too. does that circlip add an extra electrical contact surface ?

[@TheDefpom]

you really need to fix that phone screen.... I couldn't put up with that LOL

[@EEVblog]

I like it, it adds character.

[@veryboringname.]

I would have probably stuck that ruler sticker on the phone itself under the case so it'll never get rubbed off.

[@JMMC1005]

I don't believe the Wurkkos 21700 is protected. In my experience, that circuit is usually put on the negative terminal. All of the Wurkkos lights I've used have low voltage cutoff in the light itself, so I don't imagine they're bothering to bulk up their cells with protection. It's a shame your power banks seemed dodgy - Wurkkos' lights have a pretty good reputation (and the internal charging is generally fine). I wonder if these are made by a different OEM?

[@SimonCoates]

15:25 Ahh, so that's what the phrase 'blow a raspberry ' means 😂

[@carlosaugustorj]

Minipa is a Brazilian brand, 41 years old. They used to manufacture several different instruments in Brazil, today it is made in China ...

[@mrma281]

Teardown for the keyboard+monitor combo, please?

[@pault6533]

CrowView looks like my HP workstation. Is it possible it utilizes the same case and keyboard? The Casio game also styled after Darth Vader's helmet. Interesting 2-layer carbon track flex circuit. Pocket multimeter will probably clean up with white vinegar. The "0" end of the Rulerize may be better placed at the edge of the phone, so it can be used placing the edge phone against a surface.

[@electronash]

14:15 - Wang Yu to you, too, Sir. lol

[@erwe1054]

Попробуй испытать этот энкодер поднеси к нему магнит сбоку и какая будет ошибка ? Возможно им нужно подумать над разработкой дополнительной версии корпуса из ферромагнитного материала.

[@helgew9008]

The Americans almost exclusively use binary fractions when dividing the inch. So, halves, quarters, eighths, sixteenths and so on. This ruler is marked at 1/8, which is fine for just about anything. 1/16 would probably have been a bit too busy.

[@KernArc]

Came here for electronic gadgets, got some "small shafts"

[@petersage5157]

I'm sorry, but that CrowView leaves my banana flaccid. Small monitor, "adequate" keyboard, no 10-key pad; no thanks.

[@dalyxia]

I dont know if it a problem, but you leaked Tom's ( from rulerize's) phone number when you showed the letter

[@h4rk0nn3n]

Oh, I need a moose now! no more🐭

[@miroslavradev756]

Haha, Elecrow have now Dave’s voice pronouncing theirs company name. 😂

[@Iceberg86300]

Don't ask what your ruler can do for you, ask what you can do for your ruler.....

[@bobdun918]

is it possible the portable battery can only be charged when the head unit is unscrewed? When tightened it could be indicating charger voltage.

[@EEVblog]

If it does, that's stupid.

[@TheDigitalAura]

Why do you call a smart phone a shoe phone lol?

[@mohamadasriabdulazid4784]

The batteries in the power bank are garbage. 🤣

[@leaveempty5320]

Rule not ruler!

[@ArsonistBeetle]

Good. Good.

[@aarocka11]

Hehe weed number

[@EmmaBussiere-i9r]

Your channel is a real KZbin gem where every video is a little work of art. Keep up the great work 🌗🧿😕

[@Bluetank1991]

And more bots to come

[@EEVblog]

@@Bluetank1991 Only one it seems!

[@j.f.christ8421]

@@EEVblog One subscriber. Was that you Dave?

[@lasersbee]

33:56.... The Ali listing shows the USB C as a 20W Output Port and the USB A as a 20W Output and Input Port... Sorry.. I don't have the User Instructions.

[@DeathbyKillerBong]

could be battery is trashed, with a capacity of like 5mAh, so charges up quick, system thinks its fully charged, stop charge and it crashes below minimum immediately, should test batteries, or with other battery?

[@SP6QKX]

[@IvyMike.]

en.wikipedia.org/wiki/Shoe_phone