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by hippy
Thu Feb 27, 2020 5:35 pm
Forum: Troubleshooting
Topic: Dead after 5.5V Input at micro USB
Replies: 45
Views: 1259

Re: Dead after 5.5V Input at micro USB

There appear to be 17-pins in each row visible which would fit with the header being on pins 5 and 6.
by hippy
Thu Feb 27, 2020 5:23 pm
Forum: General discussion
Topic: Raspberry Pi GPU Concept
Replies: 17
Views: 565

Re: Raspberry Pi GPU Concept

I hope it can be an educational tool for STEM students to learn how their GPU works. I'm not sure how many STEM students would be interested in what you are proposing, or would need all the advanced gubbins which will come with it, PCIe connectivity and the like. I can see the merit in having a mea...
by hippy
Thu Feb 27, 2020 3:22 pm
Forum: General discussion
Topic: Raspberry Pi 4B 2GB Price Drop - NOW $35
Replies: 14
Views: 644

Re: Raspberry Pi 4B 2GB Price Drop - NOW $35

Great news and I am assuming retailers were warned or they will be sitting there with "$45" 2GB boards they have to sell at $35. A major loss in profit unless they were buying the boards at $35 and adding $10 mark-up. I'm wondering how the +$20 for an extra 2GB will affect the market seeing as the 4...
by hippy
Thu Feb 27, 2020 2:21 pm
Forum: General discussion
Topic: Raspberry Pi GPU Concept
Replies: 17
Views: 565

Re: Raspberry Pi GPU Concept

A Raspberry Pi Compute Module 4 would be amazing. The CM in the picture is just a placeholder, but the new Raspberry Pi 4 could be a working alternative for prototyping. Your ultimate plans seem a little ambitious to me, which will probably have some people thinking you're in the realms of fantasy ...
by hippy
Wed Feb 26, 2020 7:30 pm
Forum: General discussion
Topic: Raspberry Pi GPU Concept
Replies: 17
Views: 565

Re: Raspberry Pi GPU Concept

It seems that you are effectively turning a Pi Zero into a DisplayLink device, and making it compatible with DisplayLink 2.0 would actually be something useful to have. That way all the drivers and gubbins on the host side sending the image is already include in Linux which would save a lot of work,...
by hippy
Wed Feb 26, 2020 5:30 pm
Forum: Advanced users
Topic: Control an RS232 HDMI Switch
Replies: 10
Views: 188

Re: Control an RS232 HDMI Switch

But for some reason when I followed that link earlier the image definitely had a 15 pin connector - hence the warning. Weird. I can visit the site and not get the login, but it's definitely different to how it was, and well screwed up in my browser, and, yes, some of the graphics show it as a 15-way.
by hippy
Wed Feb 26, 2020 10:49 am
Forum: Advanced users
Topic: Control an RS232 HDMI Switch
Replies: 10
Views: 188

Re: Control an RS232 HDMI Switch

Only drawback is if you get a cable with a chip which Linux doesn't have a default driver for. You should be okay with FTDI, Prologic P2303, CH340, no matter how cheap, though you need to be aware of counterfeit chips.
by hippy
Wed Feb 26, 2020 10:37 am
Forum: Beginners
Topic: Please help me understand the clock pin of Serial RS232 communication
Replies: 27
Views: 405

Re: Please help me understand the clock pin of Serial RS232 communication

Please enlighten me on how to utilize the microcontroller to retrieve the data. I am desperate to figure this out. As far as I can see all the tool does is wait for a "1" to be received. It then sets the REQ line low and the gage sends 52 negative going clock pulses and associated bit data which th...
by hippy
Wed Feb 26, 2020 1:29 am
Forum: Beginners
Topic: [Raspian] How to search for packages efficiently ?
Replies: 8
Views: 191

Re: [Raspian] How to search for packages efficiently ?

They'd have been better off not knowing how to fish and just buying their fish at a market like normal people do. I guess that can be extended to any number of "would have been better off not knowing" scenarios, but I am not sure it is entirely valid. The problem you are describing seems to be one ...
by hippy
Tue Feb 25, 2020 9:30 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB to serial
Replies: 3
Views: 136

Re: USB to serial

You don't need a Sitecom cable; any USB-to-RS232-9-way-D cable should work.

Those Aliexpress modules should also work providing they aren't using "RS232" as a generic description for "serial" and are actually UART/TTL polarity and voltages.
by hippy
Tue Feb 25, 2020 9:22 pm
Forum: Advanced users
Topic: Control an RS232 HDMI Switch
Replies: 10
Views: 188

Re: Control an RS232 HDMI Switch

Should work with any USB-to-RS232-9-way-D cable. Prolific, FTDI, CH340 chipsets.
by hippy
Tue Feb 25, 2020 9:09 pm
Forum: Beginners
Topic: [Raspian] How to search for packages efficiently ?
Replies: 8
Views: 191

Re: [Raspian] How to search for packages efficiently ?

This is where the whole idea of "teaching people to code" really has it uses; where the data one has is not the data one wants. There's no need to be constrained by what someone else provides, or in the form they deliver it. A fairly simple program can shell out to get what data there is and one's o...
by hippy
Tue Feb 25, 2020 8:55 pm
Forum: Beginners
Topic: Please help me understand the clock pin of Serial RS232 communication
Replies: 27
Views: 405

Re: Please help me understand the clock pin of Serial RS232 communication

drgeoff wrote:
Tue Feb 25, 2020 8:46 pm
There are 2 versions of "Input Tool".
Actually three - RS232, PS/2 and USB.

And incredibly expensive, $300-plus for what can be done with little more than a $1 microcontroller.
by hippy
Tue Feb 25, 2020 8:31 pm
Forum: Beginners
Topic: Please help me understand the clock pin of Serial RS232 communication
Replies: 27
Views: 405

Re: Please help me understand the clock pin of Serial RS232 communication

Two possible modes? One is RS232 with the normal asynchronous transfer. 2400 baud, 1 start, 8 data, 1 stop. Another is synchronous. Uses the clock and transfers 52 bits. No start and stop bits. Maybe the latter one is the native mode and the former is only available when using the Input Tool. That'...
by hippy
Tue Feb 25, 2020 5:49 pm
Forum: HATs and other add-ons
Topic: Enable hot-plugging into breadboard by hardware
Replies: 13
Views: 292

Re: Enable hot-plugging into breadboard by hardware

I MIGHT be safe 99.99% of the time but still no guarantees, right? Some might say it's more like 50-50; you'll either blow your Pi up or you won't. It's impossible to actually quantify what risk there is when it's not known what might be hot-plugged or how. You could mitigate damage done to the Pi ...
by hippy
Tue Feb 25, 2020 5:24 pm
Forum: Advanced users
Topic: 2 pi's communicating serially through an optical fiber link
Replies: 9
Views: 346

Re: 2 pi's communicating serially through an optical fiber link

@hippy, Would you please direct me to a place where I can find some details about the codes you posted .. I couldn't understand them and what is the function of each line so that I be able to adapt them to my application .. Not sure there's anywhere which will explain the code per se. The sender op...
by hippy
Tue Feb 25, 2020 5:17 pm
Forum: Troubleshooting
Topic: [SOLVED]USB overcurrent warning
Replies: 6
Views: 194

Re: USB overcurrent warning

That seems an overly complicated fix when it seems that the current limit can be bypassed by simply wiring the USB Vbus line on the USB sockets direct to 5V input, skipping the current limit chip entirely. This will bypass the polyfuse of the pi right? Depends where you connect Vusb to. If to the G...
by hippy
Tue Feb 25, 2020 3:52 pm
Forum: General discussion
Topic: RPi not booting after power out
Replies: 33
Views: 8707

Re: RPi not booting after power out

At any random time, a Pi running off an SD card could be writing to the card, or the card itself could be doing housekeeping. If the power is cut during either of those, the card can become corrupted. It seems unlikely that it's card corruption if it doesn't boot but does when power is pulled and t...
by hippy
Tue Feb 25, 2020 2:00 pm
Forum: General discussion
Topic: RPi not booting after power out
Replies: 33
Views: 8707

Re: RPi not booting after power out

Any thoughts as to why the Pi would physically not boot back up when power is restored? Any particular circumstances under which that can happen? I used to get that with an old B+. Shut it down, unplug the power, plug it back in, wouldn't boot. Unplug it again and plug it back in and it would. No i...
by hippy
Tue Feb 25, 2020 1:42 pm
Forum: Beginners
Topic: What are the advantages and disadvantages of Arduino and Raspberry Pi?
Replies: 12
Views: 334

Re: What are the advantages and disadvantages of Arduino and Raspberry Pi?

Also Pi is orders of magnitude easier to do internet stuff. Better for that than PIC, STM32, or even ESP. In both cases though that stuff is usually done with the help of libraries so it can be just as easy to do internet stuff on a micro as well as a Pi, particularly if just simplistic stuff. In p...
by hippy
Tue Feb 25, 2020 12:39 pm
Forum: HATs and other add-ons
Topic: Enable hot-plugging into breadboard by hardware
Replies: 13
Views: 292

Re: Enable hot-plugging into breadboard by hardware

Is this also dangerous? Again, it depends on exactly what those sensors and actuators are, exactly what their interfaces are. If you can narrow it down to specifics there may be more definitive answers to give. Without that the only answer is "could be" and therefore the recommendation would be aga...
by hippy
Tue Feb 25, 2020 12:04 pm
Forum: Troubleshooting
Topic: [SOLVED]USB overcurrent warning
Replies: 6
Views: 194

Re: USB overcurrent warning

I have come across this post, https://awsh.org/2017/06/08/raspberry-pi-repair-no-usb-with-over-current-change-error-message/ this suggested to remove some part in the PCB of the pi, but since I am using an RPi 3B+. I do not know whether the components are the same, and also I am afraid to tinker wi...
by hippy
Tue Feb 25, 2020 11:36 am
Forum: Advanced users
Topic: 2 pi's communicating serially through an optical fiber link
Replies: 9
Views: 346

Re: 2 pi's communicating serially through an optical fiber link

If you put your capture image into a file on the sender, you can then transfer that file 'as is' and have it appear on the receiver. For the sender - with open("cameraimage.jpg", "rb") as fSrc: buffer = fSrc.read() SendLong(len(buffer) for byte in buffer: SendByte(byte) For the receiver - with open(...
by hippy
Tue Feb 25, 2020 11:21 am
Forum: Python
Topic: Python crc16 AttributeError: 'int' object has no attribute 'to_bytes'
Replies: 5
Views: 98

Re: Python crc16 AttributeError: 'int' object has no attribute 'to_bytes'

Do you have any documentation for the crc16 python library module that indicates that to_bytes() is a supported/implemented method for that library? My reading of the error message is that "crc16.crc16xmodem(cmd)" returns an "int" and ".to_bytes()" applied on an "int" doesn't work in Python 2. It's...
by hippy
Tue Feb 25, 2020 11:14 am
Forum: Python
Topic: Python crc16 AttributeError: 'int' object has no attribute 'to_bytes'
Replies: 5
Views: 98

Re: Python crc16 AttributeError: 'int' object has no attribute 'to_bytes'

The problem is in using Python 2 not Python 3. There is no '.to_bytes()' attribute for integers in Python 2 but there is in Python 3 - integerObject = 123 bytesObject = integerObject.to_bytes(2,'big') print("Success") pi@Pi3B:~/tmp $ python2 tobytes.py Traceback (most recent call last): File "tobyte...

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