Enviro+ [Errno 121] Remote I/O Error

Support
1

Hello,

I’ve been scratching my head on an issue for a couple of days now. I’m getting I2C errors while trying the example script for the LTR559 sensor.

I’m running a Raspberry Pi 3B+ with the Enviro+ module directly attached to the GPIO pins using the recommended Raspbian OS from the Raspberry Pi Imager utility.

When attempting to run the light.py example script from the Enviro+ GitHub page I get:

Traceback (most recent call last):
  File "Pimoroni/enviroplus/examples/light.py", line 8, in <module>
    ltr559 = LTR559()
  File "/usr/local/lib/python3.7/dist-packages/ltr559-0.1.1-py3.7.egg/ltr559/__init__.py", line 218, in __init__
    self.part_id = self._ltr559.get('PART_ID')
  File "/usr/local/lib/python3.7/dist-packages/i2cdevice/__init__.py", line 230, in get
    self.read_register(register)
  File "/usr/local/lib/python3.7/dist-packages/i2cdevice/__init__.py", line 183, in read_register
    self.values[register.name] = self._i2c_read(register.address, register.bit_width)
  File "/usr/local/lib/python3.7/dist-packages/i2cdevice/__init__.py", line 288, in _i2c_read
    for x in self._i2c.read_i2c_block_data(self._i2c_address, register, bit_width // self._bit_width):
OSError: [Errno 121] Remote I/O error

I’m not entirely certain what is actually going wrong as using the “i2cdetect -y 1” command yields:

 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- 23 -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- 49 -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --
2

23 is the LTR559, 49 is the ADS and 76 is the BME280 so i2cdetetc appears OK.
Python 2 or Python 3? If 2 try running the example in 3 or vice versa.

3

Running scripts with Python 3, tried with Python 2 as well - same result.

4

Ok, I’m not sure what’s going wrong? I have the breakout garden version of the LTR559. I run my code from python3. I run the LTR559, with a BME680, and VEML6075.
There is a contact us link on the shop page if you want to give Pimoroni a poke via e-mail. Just put a link to this thread in it.
https://shop.pimoroni.com/pages/contact-us

5

I have the exact same problem - was this resolved?