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here is an autonomous robot that has a plc as brain and an IR sensor with relay output.When the sensor detects an object, it will turn away from the object. I have been very inspired by Frits robot with the yellow wheels. I use a speed controller from velleman electronics to control the speed of the 2 gearmotors, and the servomotor is without electronics I control it with af relay and the potentiometer in the servo goes to an input on the plc, so the robot knows where the sensor is and which way ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/wannabe-wall-e