Run the I2C scanner and let us know what you get. Also post an annotated schematic showing exactly how you have wired it, show all connections, power, ground, power sources and note any wires over 25cm/10".
Run the I2C scanner and let us know what you get. Also post an annotated schematic showing exactly how you have wired it, show all connections, power, ground, power sources and note any wires over 25cm/10".