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Yet Another Plane Alt Hold

This altitude hold microcontroller for planes uses dual PIDs to maintain level flight.

First control in the chain is the PID + Clamp gate, which calculates a target Rate of Climb clamped within the values of the Clamp gate.
Second PID maintains that rate of climb.

Since this Altitude Hold mostly uses Integral Control to maintain rate of climb, it is not advised to activate it from the ground as the Integral sum will become too large for the system to compensate for.

This should only be used in flight (obviously, it's an altitude hold controller...)

Place a Linear Speed Sensor set to Vertical Speed, connect this to the Vertical Speed Sensor input.
Connect a number input to the Target Altitude input, and an Altimeter to the Current Altitude Input.
Connect your input axis (W/S) to the Input W/S node, and Elevator output to your elevators.