Relay control circuit is built on a computer via the rs232 port com pic16f628 microcontroller RF modules (433 mhz) can be controlled wirelessly with 8 relay with rs232 communication max232 project belongs to isis simulation and ares pcb drawings... Electronics Projects, 8-Channel RF Relay Control Circuit RS232 PC Pic16f628 "microchip projects, microcontroller projects, pic16f628 projects, picbasic pro examples, " Date 2019/08/03