Two IR Line Following using an external IR sensor and quarky without PID – Without Adaptive Feedback

Steps: 

1. Connect the External IR module analog pin with the quarky analog pin and select the pin on the block
2. Set IR threshold for line following and stopping the robot at the crossing lines
3. Use read analog pin block for reading IR value to get IR threshold
4. The below example uses without-PID line following blocks
5. When you click doline following robot start line following and stop at the check-point (when both IRs are at the Black line)

Script