Converter 22 DC to 7 DC SERVO

What needs to be completed: 1) Provide a protection system against incorrect connection. For example, the plus and minus of the battery were confused. 2) Make channel 5 with the ability to select power (for example: 1 V, 3.3V, 5V, 12 V) by switching the jumper. 3) Add to channel 5 the ability to control an additional load via the GPIO output. 4) Consider options for the location of the radio module and power supply (converter) in the place with the autopilot.