8 channel transmitter works on arduino using nrf24l01 2.4ghz module. It also displays the throttle value using 8 LEDs connected via 74hc164 IC. You will need the RF24 library. https://github.com/nRF24/RF24
Hardware required for remote: 2X 2 axix joysticks (thruttle, yaw, pitch, roll) 4 toggle switches (AUX 1-4) Arduino nano/uno 74HC164 IC 8 Leds NRF24L01 2.4 ghz module 3.3v step down voltage regulator for NRF24L01
Hardware required for reciever: Arduino Nano/Uno NRF24L01 2.4 ghz module 3.3v voltage regulator