PWM is a modulation technique that controls the width of the pulse based on modulator signal information. PWM can be used to encode information for transmission or to control of the power supplied to electrical devices such as motors. Generating a PWM signal with an Arduino is quite easy. There is significantly less documentation on how best to read a PWM signal. After doing some research, I have discovered three methods of reading a PWM signal with an Arduino.
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Here is a list (and a brief explanation) of the parts I’ve decided to use for my quadcopter build.
In order to maintain stability, the quadcopter must continuously take measurements from onboard sensors and make adjustments to the speed of each rotor to keep the aircraft level. The quadcopter must be able to maintain this equilibrium autonomously and this requires sensors and a sophisticated control system.