I have used a 1.kk flight controller along with an Arduino Nano and an ultrasonic sensor to add the feature of altitude hold.
Project tutorial by harsh dokania
There are numerous examples of how to connect button switches via an external interrupt. This example offers an alternative approach.
Project tutorial by ronbentley1
Switches can be troublesome! This library for controlling different types of switch and switch circuits can remove much of the hassle.
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