Problem with I2C on Raspberry Pi 4

[dominikjeske]

I have RaspberryPi 4 and when using Raspberry Pi OS i can connect to my devices on I2C (/dev/i2c-1) but I failed to do this when using HassOS. I have lates version (2024.12.3) with enabled I2C → Common tasks - Operating System - Home Assistant. I can see device but when I run my program I have I2C Error = 9

lsmod | grep i2c
i2c_dev                16384  0
i2c_mux_pinctrl        12288  0
i2c_bcm2835            16384  1

ls /dev/i2c*
/dev/i2c-0   /dev/i2c-1   /dev/i2c-10  /dev/i2c-22

just in case I tried to communicate on all dev-i2c-* but every time I have same results. Are thre any additional options to enable or diagnose this? On raspberry OS I can use i2cdetect but I don’t have permission to run this on HassOS. Any ideas?

[FloatingBoater (James Derrick)]

RPi 5 GPIO Support yet

Hi, If there is any support, it won’t be via stock HAOS/ HASS due to ADR-0019: The original RPi GPIO add-on moved to HACS, but my fix was to move from direct GPIO to ESPhome or Tasmota. On balance, maintaining a £4 Wemos D1 Mini Clone with ESPhome works fine and insulates (security and literally electrically) the RPi from hardware problems. IMHO, a cheap RPi3b might be have been worth a hardware punt for a few DS18B20 or similar, but a £60+ RPi5 isn’t.