Arduino using GROVE B as I2C
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Can anyone give me help using Grove B (BLACK) as I2c to read a compass module. I cannot use Port A (RED) as there is no space in my waterproof case.
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Hello @alpaka
unfortunately GPIO36 (one of the GPIOs used for Port B) is an input only GPIO. See here - section M5GO Base Pins and here - GPI: GPIO34-39 can only be set as input mode and do not have software-enabled pullup or pulldown functions.
I2C however requires one GPIO as output (SCL) and one GPIO which can be an out- or input (SDA). Therefore Port B cannot be used for I2C.
Thanks
Felix -
Hi Felix
thanks for your fast answer. Meanwhile I have also been looking at the GPIOs used on M5Stack and found out that GPIO36 can only be used as an input. I got my soldering gun and removed the black GROVE connector and wired a new one in White. directly to the PoGo Pins at the bottom of the M5GO. Works perfect. Would have fine not modify the module but you cannot have everything. -
BTW i forgot to mention that I also removed those nasty magnets as they disturb the used magnetometer. The metal screws where also replaced with plastic made.
