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The circuit provides a way to control a 3Ch helicopter with Arduino. Uses PPM receiver, which connects to 3 pins (pwm enabled) and using interrupts (more than just 2, via a library). Uses 2 mosfets for main rotors (coaxial motors) and a push pull (L293D) for tail rotor, so acts as elevator. Code derived from RCArduino.blogspot.com and will be posted on github.