ADXL343 using i2c not working on Pi 400 Moderators: adafruit_support_bill, adafruit

[jamestutt]

I am trying to read the ADXL343 sensor on a raspberry pi 400 using the circuit python wiring and code. When I run "i2cdetect -y 1" I see that the sensor is connected, but when I run the code in Python I get this error:


Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/adafruit_bus_device/i2c_device.py", line 154, in __probe_for_device
self.i2c.writeto(self.device_address, b"")
File "/usr/local/lib/python3.9/dist-packages/busio.py", line 166, in writeto
return self._i2c.writeto(address, buffer, stop=stop)
File "/usr/local/lib/python3.9/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 49, in writeto
self._i2c_bus.write_bytes(address, buffer[start:end])
File "/usr/local/lib/python3.9/dist-packages/Adafruit_PureIO/smbus.py", line 314, in write_bytes
self._device.write(buf)
OSError: [Errno 121] Remote I/O error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/adafruit_bus_device/i2c_device.py", line 160, in __probe_for_device
self.i2c.readfrom_into(self.device_address, result)
File "/usr/local/lib/python3.9/dist-packages/busio.py", line 156, in readfrom_into
return self._i2c.readfrom_into(address, buffer, stop=stop)
File "/usr/local/lib/python3.9/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 56, in readfrom_into
readin = self._i2c_bus.read_bytes(address, end - start)
File "/usr/local/lib/python3.9/dist-packages/Adafruit_PureIO/smbus.py", line 181, in read_bytes
return self._device.read(number)
OSError: [Errno 121] Remote I/O error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/pi/RISE/ADXL_test_code.py", line 11, in <module>
accelerometer = adafruit_adxl34x.ADXL343(i2c)
File "/usr/local/lib/python3.9/dist-packages/adafruit_adxl34x.py", line 174, in __init__
self._i2c = i2c_device.I2CDevice(i2c, address)
File "/usr/local/lib/python3.9/dist-packages/adafruit_bus_device/i2c_device.py", line 50, in __init__
self.__probe_for_device()
File "/usr/local/lib/python3.9/dist-packages/adafruit_bus_device/i2c_device.py", line 163, in __probe_for_device
raise ValueError("No I2C device at address: 0x%x" % self.device_address)
ValueError: No I2C device at address: 0x53

0x53 is the location that i2cdetect shows the sensor as being in. I ran code for the BMP388 sensor on a Raspberry Pi Zero last year and it worked fine, but now this doesn't work either on the Pi 400. The code is directly copied from the Circuit Python page for this sensor, I have updated my Pi, all of the packages have been installed, and i2c has been enabled.

I am going to try to get things running on a Pi Zero.

[adafruit_support_carter]

How is the ADXL343 connected to the Pi 400?

[jamestutt]

GPIO pins ribbon cable to T-cobbler and then on a breadboard

image01.jpg (82.99 KiB) Viewed 61 times

image02.jpg (113.7 KiB) Viewed 61 times

image03.jpg (150.44 KiB) Viewed 61 times

[adafruit_support_carter]

Thanks for photo. That all looks OK.

Try wiring up just the ADXL343. If you're not already, test by using the example from the library:
https://github.com/adafruit/Adafruit_Ci ... pletest.py

[jamestutt]

Thanks for the help,

I just have the ADXL343 connected now and I ran the code you linked to. I am still having the same problem. When I run i2cdetect, I get this:

i2cdetect.png (137.96 KiB) Viewed 59 times

Which suggests that the Pi is detecting something on the i2c GPIO input. Would this point to a Python problem?

[adafruit_support_carter]

Seems more like a marginal connection issue. Just tested things on a Pi 4 (should be nominally same as Pi 400) and it worked as expected:

Code: Select all | TOGGLE FULL SIZE

(blinka) pi@raspberrypi:~ $ python3 adxl34x_simpletest.py
-1.725970 -1.765197 12.121019
-1.686744 2.118236 8.394492
0.000000 4.981778 7.688414
5.883990 4.864098 4.471832
5.334818 2.510502 6.590069
3.687300 -1.412158 10.159689
0.117680 -1.647517 13.964670


Try re-staging things at a different location on the breadboard. And also try different jumper wires.

[mjjenk39]

I am trying to use the IS31FL3741 RGB Matrix (I2C) on the Pi Zero using Blinka and circuitPython. I am getting errors with "import adafruit_is31fl3741" on a few different example programs Ive tried. They all give the same error, and its pointing to the is31fl3741 class in the is31fl3741 __init__.py file from the library. Its calling out line 92 in __init__.py "i2c: busio.I2C..." and says "ERROR: name 'busio' not defined."

Like the original poster of this thread, Ive ran updates and all that stuff. This thread is the closest thing Ive found to the issue Im having, so I thought I would comment here rather than try to post a new question thread.

[jamestutt]

I replaced the ribbon cable, t-cobbler, breadboard, and jumper wires and it now works.

Thanks for all of you help with this

[adafruit_support_carter]

Cool, glad you got it working. Sounds like it was a marginal connection of some kind. Annoyingly marginal since the I2C scan was working, but not the full example code. That can happen sometimes though. Good luck with your project!

[adafruit_support_carter]

@mjjenk39 Please start a new thread for your issue.