I am doing PID testing on F450 Quadcopter and I need help in writing yaw axis pid code. If anyone can provide me with a pseudocode or a ready code, I would really appreciate it.
Do You have any other axis running its PID? Copy that and change to the parameters needed for jaw?
How is it different to PID for pitch and roll?
Have you looked at Betaflight or any other real quadcopter software?
Also silverware, a tinier fully capable software for quadcopters. Googlable:
silverware quadcopter
Yaw is different only in that in angle mode, pitch and roll are aiming for an attitude. Yaw is always aiming to maintain a requested rate.
In rate mode, I don’t see that there would be any difference in the theory.
Tuning yaw PID may be different, but the PID expressions are the same.
Or not?
a7
What are the parameters needed for yaw axis?
You can’t state values for P , I and D , they depend on your system - even servo arm lengths will affect values - you need to tune the values to suit .
Do you have a code that can be used to test PID values?
cirkingotler:
Do you have a code that can be used to test PID values?
This is not the place to learn, from ground up, about closed loop control systems using the PID method.
This is not where coded solutions are handed out ready to go.
Google will be faster if you just want some one else's code.
What do you mean when you say "I am doing PID testing on F450 Quadcopter "?
If you get something going code-wise on an Arduino, you may have questions appropriate for these fora.
a7
cirkingotler:
What are the parameters needed for yaw axis?
The PID takes in Setpoint (which way you want to point) Input (which way you are pointing) and produces Output (a control value in whatever range you specify that acts on the motors to change the yaw in a direction that makes Input closer to Setpoint. Because yaw is cyclic, it might be best to use Setpoint = 0 and Input = -180 to +180 relative to the desired yaw.
You can't get yaw from an accelerometer. You can get 'heading' from a GPS but only when moving. You can detect changes in yaw, but not absolute yaw, with a rate gyroscope. The best common source of absolute yaw is from a magnetic compass.
On a quadcopter, the yaw is typically adjusted by changing the speed of the clockwise propellers one way and the speed of the counterclockwise propellers the other way. Just like Pitch with the front and back propellers and Roll with the left and right propellers.
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