Debugging

Inconsistent I²C readings

I²C frequency

A first quick fix could be to choose a lower I²C frequency. In some cases this can already help to improve consistently readings. You can do this by tweaking your yaml file and add a frequency.

i2c:
  frequency: 10kHz  # (defaults to 50kHz)

Too many pull-up resistors (#44)

We need I²C pull-up resistors to make I²C to work. But since every module has their own pull-ups, we're ending up with too many pull-ups which can resolve in bad readings. This normally only happens if you had soldered the two 4K7 Ohm resistors and using the BME-Module (not the SMD version) as well as the Light-Module.

The fix is easy: Remove both 4K7 Ohm resistors from the PCB.

LD2410(c) does not work

Some versions of LD2410 and LD2410C behave somewhat peculiarly. If your ESP cannot establish a connection to the mmWave module, it may help to swap the RX and TX pins contrary to their labeling. To do this, simply adjust your ESPHome config accordingly.

# In this example, the pins are already swapped.
substitutions:

  # ESP32-C3 mini
  uart_rx_pin: GPIO21
  uart_tx_pin: GPIO20

  # ESP32-D1 mini
  uart_rx_pin: GPIO1
  uart_tx_pin: GPIO3

  # ESP32-S2 mini
  uart_rx_pin: GPIO39
  uart_tx_pin: GPIO37

  # ESP2866-D1 mini
  uart_rx_pin: GPIO1
  uart_tx_pin: GPIO3

Source: https://github.com/esphome/issues/issues/4317#issuecomment-1474937332