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by omniboard
Wed Nov 07, 2018 10:42 am
Forum: For sale
Topic: 29x GPIO, 15x ADC ports (4x 5MSPS), 2x DAC, 19x PWM, 16x SERVO, 4x WS2812 HAT
Replies: 2
Views: 3787

Re: 29x GPIO, 15x ADC ports (4x 5MSPS), 2x DAC, 19x PWM, 16x SERVO, 4x WS2812 HAT

@mahjongg HAT does not have to have an EEPROM to be the "legal" HAT. It is enough to make RPi to think that the HAT has one.

EEPROM is emulated by the uC and it is allowed. Look at github discussion about eeprom emulation it. So it is the HAT.

https://github.com/raspberrypi/hats/issues/43
by omniboard
Fri Nov 02, 2018 8:41 pm
Forum: For sale
Topic: 29x GPIO, 15x ADC ports (4x 5MSPS), 2x DAC, 19x PWM, 16x SERVO, 4x WS2812 HAT
Replies: 2
Views: 3787

29x GPIO, 15x ADC ports (4x 5MSPS), 2x DAC, 19x PWM, 16x SERVO, 4x WS2812 HAT

Universal Plus GPIO / ADC / DAC / SERVO hat for Raspberry Pi Advanced I/O Raspberry Pi hat. Integrates GPIO, ADC, DAC, PWM, SERVO and WS2812 LEDs controller. Using this hat you can create almost everything like the weather station, robots, oscilloscopes, machines and home automation systems. Total ...
by omniboard
Fri Nov 02, 2018 8:25 pm
Forum: For sale
Topic: Oscilloscope with the Raspberry Pi software
Replies: 0
Views: 3458

Oscilloscope with the Raspberry Pi software

Hi, {A bit of self promotion} I have created a simple 2 channels oscilloscope, function generator and Serial <> USB converter. OSCILLOSCOPE: 2 Channels Two channels -16.5V ÷ 16.5V 18MSPS max real real sampling rate Support of 12, 8 and 6 bits resolution. 12bits mode: sample rates are: single channel...
by omniboard
Wed Oct 31, 2018 6:27 pm
Forum: Raspbian
Topic: Installing a .c driver?
Replies: 6
Views: 413

Re: Installing a .c driver?

A google search for "compile device driver debian" will find you a ton of descriptions as to how to do that. I afraid it is a mission impossible fot someone who does not know what the .c file is. I do not discourage anyone from trying but kernel device drivers are a bit too advanced topics for the ...
by omniboard
Wed Oct 31, 2018 11:55 am
Forum: Raspbian
Topic: Stretch - key server problem
Replies: 1
Views: 318

Re: Stretch - key server problem

My solution (workaround): I was forced to install the key manually: 1. go to : http://keyserver.ubuntu.com/ 2. Find the key you need. If the key is in the HEX form add 0x tat the beginning https://www.diymat.co.uk/wp-content/uploads/2018/10/1.jpg 3. If the key exists choose the pub one (or any appro...
by omniboard
Wed Oct 31, 2018 9:46 am
Forum: Raspbian
Topic: Stretch - key server problem
Replies: 1
Views: 318

Stretch - key server problem

Hi. After upgrade I have started to have problemds with the key servers: Examples sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF Executing: /tmp/apt-key-gpghome.74nckX95XJ/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys ...
by omniboard
Mon Sep 24, 2018 12:24 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

jamesh wrote:
Sun Sep 23, 2018 5:49 pm


To answer your question.

Yes, it is completely safe to pull current from the USB ports.
Thank you.

So I am starting to port the software.
by omniboard
Sun Sep 23, 2018 5:14 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Burngate wrote:
Sun Sep 23, 2018 12:05 pm
Could you answer my question?
Not at the moment as I am not at work today :)
by omniboard
Sun Sep 23, 2018 11:18 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Edit: USB spec defines a unit load as 100mA. Although the page linked about also uses 2mA as a unit at one point, so is suspect. It is not suspect. You just did not read it. The units of power are 100mA or 150mA. The 2mA unit is only used in the device descriptors (data sent from the device to the ...
by omniboard
Sat Sep 22, 2018 10:34 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

If you stick to using standard mA instead of your "units", it will help others understand your posts a bit better Sorry mate - but the units are not mine only defined in the USB standard. And I think, only pepole who know what does it mean can answer this question. If someone does not - just does n...
by omniboard
Sat Sep 22, 2018 10:19 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

It really, really is the prime suspect. If it is the only thing plugged in at the time when the USB power fails - it is the No 1 suspect It is not the suspect - but of course it kills the RPi? A paradox? Not - The dongle was tested and dynamically measured. And the current draw does not exceed 3 un...
by omniboard
Fri Sep 21, 2018 12:36 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

No - as I wrote it was just the Pi connected to the monitor + the dongle . Nothing else. Most odd then. I suspect the dongle is broken and shorting something out, but difficult to tell. Clearly not in inherent issue with the Pi itself, if all other devices seem to work fine (ie for everyone else ou...
by omniboard
Fri Sep 21, 2018 11:00 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

No - as I wrote it was just the Pi connected to the monitor + the dongle . Nothing else.
by omniboard
Fri Sep 21, 2018 10:42 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Yes -- just the dongle and the HDMI to set the WiFi password and to enable the SSH. Then I access the Pi remotely. My hats actually are not connected to the USB -> https://www.diymat.co.uk/product-category/raspberry-pi-hats-accesories/diymat-raspberry-pi-hats/ By the time it happens I did not connec...
by omniboard
Fri Sep 21, 2018 9:41 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Most of the boards died (I have killed 3 of them this way) when I was connecting the HP wireless dongle Occam's Razor means that its your wireless dongle that is suspect Thank you :) But if you read my previous post - it is not the suspect. As I wrote I have tested it an hour ago. Works as it shoul...
by omniboard
Fri Sep 21, 2018 9:28 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

No, we havn't replaced a huge number of Pi with broken USB ports. Thereis no evidence that the Pi design damages other devices, or allows other devices (as long as they are compliant) to damage it. I do not know what is causing you problems, but I don't think it's the USB. We've sold 20M devices, I...
by omniboard
Fri Sep 21, 2018 12:56 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Paeryn wrote:
Fri Sep 21, 2018 12:03 am

I may be wrong, I've never had anything needing much power plugged in.
All my RPI3 B USB died when I was trying to draw about 200mA (one device - one port - 100-300mA max)

So it is definitely 600mA / port which is actually more than USB 2.0 standard permits.
by omniboard
Fri Sep 21, 2018 12:51 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

There is ESD protection built in but I think ESD protection on any device breaks down when subjected to repeated events? I don't catch it. What repeated events? There is only one event - devices draw some current from the USB which 100% permitted by the standard. I do not see any events for the ESB...
by omniboard
Thu Sep 20, 2018 9:17 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

klricks wrote:
Thu Sep 20, 2018 7:35 pm
The USB control chip is U13 on older RPi models or the 6 pin chip near the PoE connector on the 3B+
Thank you.

But to let us know (not you of course - the RPi engineers) what is the limit would be nice.
by omniboard
Thu Sep 20, 2018 6:21 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

Please provide evidence to support the claim that "thousands" of Raspberry Pi users have had to modify their boards. Also, what are the symptoms of the alleged issue and how are they rectified by the modification that you claim is necessary? I believe that the dead RPi USB is one of the most common...
by omniboard
Thu Sep 20, 2018 6:01 pm
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

Re: The USB power appeal

topguy wrote:
Thu Sep 20, 2018 2:40 pm
Lets start with "What is the problem that this red wire is supposed to fix."
The problem is:

Dead RPi USB port - actually no power there.
by omniboard
Thu Sep 20, 2018 11:10 am
Forum: Troubleshooting
Topic: The USB power appeal
Replies: 43
Views: 3775

The USB power appeal

Dear Raspberry Pi,

Please publish the part of the schematics which covers the USB power. Thousands of the RPi users are forced to do silly workarounds like this: Image
to have their RPis working.

Which part is causing the problem?

Thank you
Peter

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