UART - sending from pyboard to PC

[ulrich]

Hi Dave,

Thanks for all your hints!! - unfortunately this is not the issue as well (I've tried all variables everywherer..

Maybe I failed to explain the problem correctly: How do I send information from my pyboard to a program running on my PC (the latter being written in python, of course...).

I connect by USB cable using screen to the pyboard. When I enter tmp = usb.send(b'testup') - I want the string "testup" to appear in the programm running at my pc and not on the pyboard in the variable tmp.

Any ideas?

Greatings from Hambug to Canada!

Ulrich

[fma]

Why don't you use a real UART on the pyboard, and connect it to your PC using a USB-TTL cable (FTDI)? This way, you keep your usb line for console and program transfert (using pyboard.py), and you have a dedicated serial line to send your own commands...

[Damien]

The issue is that you can't connect to the pyboard's serial device (/dev/ttyACM0) with 2 different programs. In this case your 2 different programs are "screen" (to get the REPL), and your script running on your PC.

Try the following:

On pyboard run this:

Code: Select all

>>> usb = pyb.USB_VCP()
>>> def output():
...   while True:
...     usb.write("hello!\n")
...     pyb.delay(1000)
...
>>> output()

Then make sure you quit from screen/picocom/minicom.

Then run this on your PC:

Code: Select all

>>> import serial
>>> ser = serial.Serial('/dev/ttyACM0',9600, timeout=1)
>>> ser.readline()

That should work: you should get "hello\n" returned back to your PC.

[ulrich]

Great! Thanks a lot, this did it! Problem solved!

Knowing it now, it seems so obvious....

[Adam]

As soon as I get permission I can post up some progress I made with the hc05. Admin has me locked out from the new registration process.

[blmorris]

@Adam - looks like your posts are showing up now. I think that once a new user has two posts that clear moderation then you can post freely.
-Bryan

[priis]

Does someone have a simple example of reading a sensor, for instance the built-in-accelerometer, and sending the value back to the computer (reading with a python-program based on pyserial)?

Poul Riis

[hbgmysite]

I still looking this thread, thanks for sharing