One interesting part about LEDs is that they are diodes (Light emitting diodes) so electricity will only flow through them one way. Based on this principle when we attach them to where the motor was, when the motor would be spinning one way, the electricity flows one way and will light up the LED. When you flip a switch on your transmitter it would make the motor spin the other way which makes electricity flow the other way but it can't becasue the LED won't allow it through the other direction. This essentially turns off the light. When paired up (the + of one LED to the - of the other and vice versa) when the motor spins one way, one LED lights up, flip the switch and that one turns off and the other turns on. This is what we will be making
Step 1: Take apart the servo
Step 2: Prepare and solder your interface wires
Step 3: Heat Shrink Time
Step 4: Done!
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Showing it on auto (sweeping) with the servo to show what the commands going to the circuit look like.