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Put it anywhere between the Serin and Serout. After you send the program to the RC, leave the cable connected. A little blue window should pop up on your computer screen that scrolls the values of rc_sw1 whenever the robot is running.
Debug?, along with the rest of the debug family, are the staples of bug finding. Alternatively, you can drop your code in RoboEmu and see what happens when you turn on sw1. If it works in RoboEmu, it's probably an electrical issue.
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