Rasptank: Could not determine default I2C bus for platform

1645975525

Hi All,
I was trying to debug the servos and nothing happened. Wen I run webServer.py, server.py, serverTest.py and just about anything I get an error like the one below. There are a number of similar problems all over the internet with no clear fix. Can someone please help?

pi@pi:~/adeept_rasptank $ python3 initPosServos.py
Traceback (most recent call last):
  File "/home/pi/adeept_rasptank/initPosServos.py", line 9, in <module>
    pwm = Adafruit_PCA9685.PCA9685()
  File "/usr/local/lib/python3.9/dist-packages/Adafruit_PCA9685/PCA9685.py", line 74, in __init__
    self._device = i2c.get_i2c_device(address, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/Adafruit_GPIO/I2C.py", line 63, in get_i2c_device
    busnum = get_default_bus()
  File "/usr/local/lib/python3.9/dist-packages/Adafruit_GPIO/I2C.py", line 55, in get_default_bus
    raise RuntimeError('Could not determine default I2C bus for platform.')
RuntimeError: Could not determine default I2C bus for platform


Thanks very much,
James

1646420360

遇到同样的问题！

Adeept003

It may be due to the incompatibility between the latest image file of raspberry pie and some dependent libraries.
Please try to burn the image file of the official old version of raspberry pie (2021-05-07),
the image download link (zip file):https://downloads.raspberrypi.or ... s_armhf-2021-05-28/]

1653618562

It because Adeept's product does not support latest Raspberry PI 4.

the Adafruit_PCA9685 you are using is a quite old module, which has been deprecated for a long time. In its source code, there is no 'BCM2711' which is being used by Raspberry PI 4, so it cannot recognise Pi 4 at all.

one workaround is edit this file:
/usr/local/lib/python3.9/dist-packages/Adafruit_GPIO/Platform.py

Search:
elif match.group(1) == 'BCM2835':

replace it with:
elif match.group(1) == 'BCM2711':

1660316805

I encountered the same issue (and some others), so i wrote a little step-by-step guide (for Rasptank) and modified setup.py script (https://www.adeept.com/forum/thread-866-1-1.html).

1662130188

1653618562 replied at 2022-5-27 10:36 AM
It because Adeept's product does not support latest Raspberry PI 4.

the Adafruit_PCA9685 you are us ...

What should I do to edit platform.py?
I was going to edit the file, but contents for change was not saved.

1662052843

Check out this thread: https://www.adeept.com/forum/thread-866-1-1.html

1667074577

1662130188 replied at 2022-9-2 11:05 PM
What should I do to edit platform.py?
I was going to edit the file, but contents for change was no ...

I have got the same issue. Have you solved the issue? Thank you very much.

1667754109

Type "sudo nano platform.py"   This will open up the nano editor as the superuser and give you temporary permission to save changes.

1667754109

Then CTRL^X. To exit    Y to agree to save.  Press Enter key to save filename as "platform.py"