Topics created by learly6

Hello @learly6

maybe the issue is the I2C clock speed. Looking at each example it seems that the MLX 90640 is setup with 450 kHz (interestingly the comment says 400 kHz) whereas the Ultrasonic Range Sensor is setup with 200 kHz.

The MLX datasheet indicates I2C clock speeds of 400 kHz and up. I cannot find a datasheet for the Ultrasonic Range Sensor.

I'd double check the I2C frequency and whether both sensors can deal with either 200 kHz or 400 kHz.

Another thing to keep in mind are the pull-up resistors. Most (if not all) I2C sensors have built-in pull-up resistors. With each additional sensor the resulting resistance gets smaller as they are all in parallel.

Thanks
Felix

Hello @learly6

no, you don't need a softI2C library. The ESP32 in the M5Stack device already takes care of that for you. You can select almost any two pins to be used for I2C. This tutorial explains it quite nicely.

Thanks
Felix