Three IR Line Following using an external IR sensor and Quarky with PID – Adaptive Feedback

Steps:

1. Connect the External IR module digital pin with the Quarky 
2. Set IR threshold using a potentiometer on the module for line following and stopping the robot at the crossing lines
3. The below example is of the PID line following blocks
4. When you click doline following robot start line following and stop at the check-point (when both IRs are at the Black line)

Script