Raspberry Pi OSError: [Errno 121] Remote I/O error

[thEpisode]

Hi guys, I followed this tutorial https://learn.adafruit.com/adafruit-veml6075-uva-uvb-uv-index-sensor/python-circuitpython but when I'm trying to use the code I got the following error:

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/adafruit_bus_device/i2c_device.py", line 68, in __init__
    i2c.writeto(device_address, b'')
  File "/usr/local/lib/python3.5/dist-packages/busio.py", line 65, in writeto
    return self._i2c.writeto(address, buffer, stop=stop)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 38, in writeto
    self._i2c_bus.write_bytes(address, buffer[start:end])
  File "/usr/local/lib/python3.5/dist-packages/Adafruit_PureIO/smbus.py", line 244, 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/python3.5/dist-packages/adafruit_bus_device/i2c_device.py", line 74, in __init__
    i2c.readfrom_into(device_address, result)
  File "/usr/local/lib/python3.5/dist-packages/busio.py", line 55, in readfrom_into
    return self._i2c.readfrom_into(address, buffer, stop=stop)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 44, in readfrom_into
    readin = self._i2c_bus.read_bytes(address, end-start)
  File "/usr/local/lib/python3.5/dist-packages/Adafruit_PureIO/smbus.py", line 155, 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 "veml6075.py", line 8, in <module>
    veml = adafruit_veml6075.VEML6075(i2c, integration_time=100)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_veml6075.py", line 106, in __init__
    self._i2c = I2CDevice(i2c_bus, _VEML6075_ADDR)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_bus_device/i2c_device.py", line 76, in __init__
    raise ValueError("No I2C device at address: %x" % device_address)
ValueError: No I2C device at address: 10

Code used:

import time
import board
import busio
import adafruit_veml6075
 
i2c = busio.I2C(board.SCL, board.SDA)
 
veml = adafruit_veml6075.VEML6075(i2c, integration_time=100)
 
print("Integration time: %d ms" % veml.integration_time)
 
while True:
    print(veml.uv_index)
    time.sleep(1)

I checked the connections and enabled I2C from Raspi config.

Pd: Raspberry Pi 3 B+

[caternuson]

Can you run i2cdetect from the command line and post output here.

i2cdetect -y 1

[thEpisode]

Sure, the result is:

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

[caternuson]

It's not showing up at all. It may be hardware related. Have you posted this in the forums?
https://forums.adafruit.com/

[thEpisode]

Umm no, I haven't posted this yet, but what is the problem? what has to be seen in that result?

[caternuson]

The above is a scan of all devices attached to the I2C bus. It should return the address for any found device. In your case, it returned nothing. Most often this a wiring or solder issue. Posting a photo of your setup in the forums would help with figuring that out.

[thEpisode]

ooohh thanks, I'll be close this issue while my problem are solved, thank you!

[ShaunBorg]

Hello I have the same problem but mine is detecting the object

[caternuson]

@ShaunBorg Also worth posting in the forums.

[lpnaunau]

Hi, I'm having also this error and I'm detecting the device as well. I think there is an issue with the Adafruit library. @ShaunBorg did you find a solution ?

[ShaunBorg]

No i had 1 week to find and I didnt got a clue how to do it

…

On Tue, 23 Apr 2019, 16:08 lpnaunau, ***@***.***> wrote: Hi, I'm having also this error and I'm detecting the device as well. I think there is an issue with the Adafruit library. @ShaunBorg <https://github.com/ShaunBorg> did you find a solution ? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#4 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AL2RUBW7DHVAJYAD5SAHZJDPR4J5NANCNFSM4GSPB53Q> .

[caternuson]

Please post these issue in the forums. It's likely either hardware related or something specific to your RPi setup. Everything checks out with fresh install of Raspian Lite (2019-04-08), blinka install, and this library.

Set up:

What running i2cdetect should look like:

pi@raspberrypi:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 

And running this test code (from guide):

import time
import board
import busio
import adafruit_veml6075

i2c = busio.I2C(board.SCL, board.SDA)

veml = adafruit_veml6075.VEML6075(i2c, integration_time=100)

print("Integration time: %d ms" % veml.integration_time)

while True:
    print(veml.uv_index)
    time.sleep(1)

should look something like this:

pi@raspberrypi:~ $ python3 veml_test.py
Integration time: 400 ms
-0.023346945
0.0258415
0.027867500000000003
0.027137
0.027137
0.025841

[AnastaZIuk]

Hello I have the same problem but mine is detecting the object

and somebody got an answer what to do in that case?

[danchendrickson]

I get a the same error in my code. My code will work, I will see the sensor at 0x68 or 0x69, and the code will run. If I then stop the code to make a change (like how it outputs the data to file, unrelated to this section) the sensor gives Errno 121. I2Cdetect then returns all 0s.

[Purvendra]

I am able to detect the device ID, still getting the same error. Can anyone help me out with this please?