Raspberry Pi Forums

Heater

Thanks for the replies! Solidworks PCB can be used to design PCBs I believe. As far as I can tell SolidWorks PCB actually uses Altium under the hood to get the actual circuit and board layout done: https://www.javelin-tech.com/3d/technology/solidworks-pcb/#capabilities https://www.altium.com/ All o...

Heater

Easy. I was once using a supply "brick" with a switch on it to select 5, 9, 12, 15 volts or whatever. Once I powered a Pi from it with the switch accidentally pushed to the 12v position. Smoke came out, the protection diode jumped off the board. I turned it off quickly. Amazingly that Pi still worke...

Heater

I think it would be appreciated if you continued the discussion of your problem in one of the other two threads you started about it. Rather than cluttering up the forum with the the same thing over and over.

viewtopic.php?f=63&t=278010&p=1684070#p1684070

Heater

What can be done with an NVIDIA Jetson that can't be done better with an old desktop PC? Not sure yet. It's certainly better at taking up a lot less space. Which has become important since my workspace has been downsized to a desk not much bigger than the one I had in primary school. That Jetson NX...

Heater

The Surface Pro X shipped last November. ... Dang, I'm out of touch. That thing has built in LTE. Just what I always wanted. Except of course the times when I need an always connected device like that I also need a pile of x86 Windows only configuration tools from various hardware device makers. I ...

Heater

Start here: https://learn.sparkfun.com/tutorials/be ... e-to-kicad

Heater

Putty is just awful.

It might have been necessary back in the days of the "DOS box" command line of Windows, which is also awful.

Today I install the Windows Subsystem for Linux with a Debian user land running inside it. Then I can ssh from a real command line shell on Windows. So much nicer.

Heater

Hi and thanks! Yeah, I found a lot out there, butthe focus is on ROBUST (as usable in the top of a backpack or on the beach). So any data points for that use? Is a zero enough and reliable? Obviously if you attach a Pi Zero to a GPS module and some display and whatever you use for a power supply wi...

Heater

Clearly the example we had earlier in this thread was not safe and needs urgent repair. Not clear at all. Our OP, Ravichandra, has never returned to answer the questions as to what exactly they meant by "shock". Was it a little static "prick"? Was it a gentle "fizz" of a normal floating from ground...

Heater

The whole world is going upside down. The fastest super computer is now ARM based. Apple is about to switch from Intel to their own customized ARM. How long will it be before Microsoft starts shipping ARM based Surface Pro's and the like? If Apple can do it so can MS, perhaps with the help of Nvidia...

Heater

But,I want to release the window ,without close the whole program. So don't write code that closes the whole program! In my first example I showed how to catch a 'c' typed om the keyboard and close the window but leave the programming in running without any graphics rendering. The second example sh...

Heater

Perhaps with the pynput module https://pypi.org/project/pynput/: from pynput import keyboard def on_press(key): try: print('alphanumeric key {0} pressed'.format( key.char)) except AttributeError: print('special key {0} pressed'.format( key)) def on_release(key): print('{0} released'.format( key)) if...

Heater

Personally I would not try to cross compile all this. Cross compiling makes the whole process a thousand times more difficult. Also why not use Qt 5? Just install Qt 5 and opencv on to the Pi. You will need to install the opencv development package: $ sudo apt-get install libopencv-dev If you do "ap...

Heater

Why do you insist on starting two threads for the same question? That is not appreciated here. I think the problem is to --> cv2.waitkey(1) (Part of camera) ,because(maybe) ,because(maybe) waits for user input (I don't know)... You know, if you type "opencv waitkey" into google search you immediatel...

Heater

import jetson.inference import jetson.utils import sys import cv2 import numpy as np # For RTMP stream from server capture = cv2.VideoCapture('rtmp://example.com/video/blabla') if not capture.isOpened(): print ("Error opening capture device") capture.release() cv2.destroyAllWindows() sys.exit(-1) #...

Heater

That machine:

Reminds me immediately of the Krel machine:

Heater

Ironically a page about the top 500 super computers in the world has collapsed under the load of all the Pi heads following your link: "The server is temporarily unable to service your request due to maintenance downtime or capacity problems." :) But you can read about it here: https://www.datacente...

Heater

A couple of years ago we installed some equipment up a pole in a street in San Jose. Which included a Raspberry Pi, to keep things on topic. San Jose city had us use one of their regular, approved electrical contractor companies to do the installation and hook up the power. Getting all this drawn up...

Heater

As Heater and I said, not possible with Python. Except of course it is perfectly possible with pigpio waves. I have done it. Have you? Have you really? You keep saying that but you have not posted any code here. Meanwhile our OP still does not seem to have a working solution to his problem. So plea...

Heater

Is this a useful thing or not?
https://www.tomshardware.com/uk/amp/new ... ii-100-fps

I have no idea what all this Vulkan stuff is about anyway. Perhaps someone could enlighten me.

Heater

In my experience cross-compiling anything makes the problem an order of magnitude or two bigger. I have spent countless hours trying to get things to cross compile. Only occasionally with success. So unless you can find a bullet proof ready made script or instructions to do it I strongly suggest bui...

Heater

Back in the day I wanted Qt 5 on an original mode Pi and so I had to build it from source as Raspbian only had Qt 4 at the time. Now you have the opposite problem. You might get some clues from the instructions I followed to build Qt 5: https://wiki.qt.io/Native_Build_of_Qt5_on_a_Raspberry_Pi https:...

Heater

The Pi is not picky about SD cards. I have used all kind of brands in sizes from 8 to 32GB. If this were a general problem we would be hearing people complain about it everyday here.

Are you sure those SD cards work at all? Have you tried them in other devices?

Heater

cleverca22 wrote: ↑
Sat Jun 20, 2020 9:35 pm
you can just read the serial port as normal, and that wont interfere with the generated signal any

Can you?

Don't forget our OP calls for bit-banged serial communications as well.

Heater

cleverca22 wrote: ↑
Sat Jun 20, 2020 8:28 pm
i have been experimenting with abusing the DPI peripheral for exactly this kind of thing...

That is good hacking.

Now try and do all that whilst waiting on bytes from a serial input and responding appropriately.

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