In a personal project, I wanted to add 2 new devices to an existing quadcopter. The quadcopter was equipped with a 6-channel receiver meaning I only had 1 spare channel to control the 2 devices:

The following arduino library was written to use the findings found during the Mapping RC Transmitter PWM signal to actual transmitter values{.row-title} article. All results were wrapped into a library for ease of use.

If you ever need to use an RC Transmitter & receiver for a personal project, an easy way to retrieve the signal is to connect the receiver to a micro-controller.