<![CDATA[Arduino using GROVE B as I2C]]>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.

]]>https://community.m5stack.com/topic/5657/arduino-using-grove-b-as-i2cRSS for NodeWed, 29 Apr 2026 06:42:42 GMTWed, 20 Sep 2023 16:24:05 GMT60<![CDATA[Reply to Arduino using GROVE B as I2C on Wed, 20 Sep 2023 19:33:20 GMT]]>@felmue

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.

]]>https://community.m5stack.com/post/22282https://community.m5stack.com/post/22282Wed, 20 Sep 2023 19:33:20 GMT<![CDATA[Reply to Arduino using GROVE B as I2C on Wed, 20 Sep 2023 19:26:44 GMT]]>@felmue

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.

]]>https://community.m5stack.com/post/22281https://community.m5stack.com/post/22281Wed, 20 Sep 2023 19:26:44 GMT<![CDATA[Reply to Arduino using GROVE B as I2C on Wed, 20 Sep 2023 17:16:28 GMT]]>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

]]>https://community.m5stack.com/post/22280https://community.m5stack.com/post/22280Wed, 20 Sep 2023 17:16:28 GMT