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I'm trying to make a Quadcopter from scratch, I have a fair amount of experience with adruinos, and I'm trying to understand how to necessary systems work, and I can't seem to figure out what PID means, is it a method of regulating pitch and roll? like a stabilizer? I think from what I've read that its a system that detects orientation of the craft and tries to correct it

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The term PID itself refers to Proportional plus Integral plus Derivative control, which is a very common control technique. The IMU (inertial measurement unit) measures the orientation of the quadrotor, and the roll/pitch/yaw values are used in the PID controller to calculate motor commands.

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  • $\begingroup$ So the pid takes the output of the imu and sends the appropriate command to the motors? $\endgroup$ – austinphilp Sep 17 '14 at 19:35
  • $\begingroup$ Basically, yes. There are also some user-defined tuning variables to adjust how strong the motor command is relative to the error. $\endgroup$ – ryan0270 Sep 17 '14 at 22:56

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