Topics created by crami25

@domi
Are you using the "4Relay module" or the "4Relay unit" or the "2Relay module" ?

If you still get an error, try to make a simple Uiflow programm scanning the i2c bus with the 4Relay connected:
0_1675006853542_cfe4a152-de11-4d5b-8158-f44191defe28-image.png
You should get the number [38, 117] displayed as Label0, 38 is the decimal for 0x26.
If you get 37 you have another firmware than I have (I2C address 0x25).
If you only get [117] your 4Relay module is not connected to the M5Stack core. 117 (0x75) is the I2C address of the battery management chip.

@crami25 Thanks for the comprehensive reply. It really helps to deepen my understanding. As you pointed out, I always check the M5 Unit's schematic first to assure the protective resistors when I connect the Units to an ESP developing board.

It's simple, fill in the code from the example, hold the magnet to the M5stickC and you will see that the readings will change significantly! The magnet is needed strong enough, because The sensor is far away in the device.