Enabling i2c on HassIO for BH1750 light sensor

thedroidd · October 26, 2018, 6:35pm

Can’t seem to get my BH1750 light sensor up and running on HassIO. Always get the same error:

Error while setting up platform bh1750
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/smbus/smbus.py", line 81, in open
    self._fd = os.open(path, os.O_RDWR, 0)
FileNotFoundError: [Errno 2] No such file or directory: '/dev/i2c-1'

I was able to get it running fine on a Hassbian installation following the instructions for setting up smbus support here, but I don’t see any way of doing this on a HassIO installation. Is there an addon available that would enable i2c functionality? Any help would be appreciated!

tom_l · October 26, 2018, 7:04pm

Use HassOS and set your config.txt file as per this document:

github.com

home-assistant/operating-system/blob/dev/Documentation/boards/raspberrypi.md

# Raspberry PI

Supported Hardware:

| Device | Board |
|--------|-----------|
| Raspberry Pi A+/B/B+| rpi |
| Raspberry Pi Zero | rpi |
| Raspberry Pi Zero W | rpi0-w |
| Raspberry Pi 2 B | rpi2 |
| Raspberry Pi 3 B/B+ | rpi3 / rpi3-64 |
| Raspberry Pi 4 B | rpi4 / rpi4-64 |

## Limitation 64bit

The 64bit version is under development by RPi-Team. It work very nice but it could have some impacts. Actual we see that the SDcard access with ext4 are a bit slower than on 32bit.

## Serial console

For access to terminal over serial console, add `console=ttyAMA0,115200` to `cmdline.txt` and `enable_uart=1`, `dtoverlay=pi3-disable-bt` into `config.txt`. GPIO pins are: 6 = GND / 8 = UART TXD / 10 = UART RXD.

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thedroidd · October 26, 2018, 8:58pm

Added the 2 lines listed to my config.txt file and made a USB stick (named CONFIG with the listed rpi-i2c.conf file inside a folder called ‘modules’). Still getting the same error.

vitaalz · February 12, 2019, 11:53am

Maybe this can help: How to enable I2C on hass.io / resin.io