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you want to know how to use I2C to talk to an existing RKI-1350
I2C Address Selection
The default I2C address is 0x12. ADR2 shorted to GND will set the address to 0x14, ADR1
shorted to GND will set the address to 0x16, ADR1 and ADR2 shorted to GND will set the
address to 0x18. If the PPM signal is shorted to GND on start-up the driver will set the
addresses as 0x22, 0x24, 0x26 and 0x28 instead of 0x12, 0x14, 0x16 and 0x18. This allows for
an additional 4 address.
I2C Set Speed
Send an I2C start command with the I2C address that is set for the driver. Then write a byte
from 0 – 255 which denotes the speed of the motor. Then send the I2C stop command. The
motor speed will be set accordingly