- Expansion for Fischertechnik Robo TX -
The number of IO-ports on the RoboTX controller is very limited. So I developed an expansions circuit that adds another 8 digital inputs and 8 PWM controlled outputs. Two output can be used together to drive a PWM controlled motor in both directions.
The expansion is interfaced to the Robo TX controller using the I²C (also called TWI by Atmel) interface. I²C support requires the newest version of firmware and software for the Robo TX controller!
Please note that I built my expansion using a piece of prototyping PCB. I have never built it using the PCB included in this project.
- 8 digital inputs
- 8 PWM controlled outputs, up to 200mA. Pairs of outputs can be used to drive a motor in both directions.
- I²C interface to the RoboTX controller (use the right side connector). Base address used is 0x20 (HEX).
Included in the project files
All files to build the board are included in the project files.