Let us build a long range 4 channel Remote controller for our robots. Yes, you heard that right. A cheap DIY four channel RC plane Transmitter and Receiver with a range of 1.8 KM using Arduino Nano, joystick and HC12. Not just for plane, with a little bit of tweak in the code, you can control RC car, Boats, helicopters, quadcopters etc.
For complete tutorial and code, Visit the link below: http://rootsaid.com/4-channel-rc-plane/