ERROR DESCRIPTION:
- Provided example code and documentation recommends using frequency 50000 but this results in
ValueError: Unsupported baudratewith the circuit described below - Default frequency of 100000 does work in limited testing but is specifically recommend against by the SCD30 datasheet
- I cannot find a list of baudrates supported by Adafruit Feather M0 Datalogger. Other common baudrates <50000 were tested but all resulted in the same ValueError.
CIRCUIT:
- Using Adafruit Feather M0 Datalogger with CircuitPython 7.3.3. and SCD30 sensor connected via i2c
- I am not using Adafruit Part ID 4867, I am using an SCD30 directly, without the Adafruit breakout board. This means the SCL and SCA lines are 3.3v despite the SCD30 datasheet recommending an i2c high of 3v max. I don't believe it is relevant to this issue however.
CODE:
import adafruit_scd30, time, board, busio
#i2c = board.I2C() # this works
#i2c = busio.I2C(board.SCL, board.SDA, frequency=100000) # this works
i2c = busio.I2C(board.SCL, board.SDA, frequency=50000) # this does not work
scd30 = adafruit_scd30.SCD30(i2c)
time.sleep(5)
print("CO2: %d PPM" % scd30.CO2)
CODE OUTPUT:
ValueError: Unsupported baudrate