ENCODER is compatible with the M5STACK FACE Kit. You can have it replace the keyboard panel inside the FACE kit. It is designed for rotary encoder control, integrated Mega328 microprocessor inside, and LEDs around the encoder.
The series communication protocol between M5 core and ENCODER is IIC (address: 0x5E)
I posted a review of a different product.
Good products. Took 9 days to Japan via registered China Post mail with tracking. Packet in hard shelled box.
A suitable device. Today launched with arduino. No schematics. 5 v 3.3 v connect necessarily.