Construct The Component Board

The main board circuit design completed and can printed. The circuit simulate using the Proteus software and because there no RF receiver and transmitter in this simulation software, it replaced with the push button to test it function or not. In the software part, the RF module use as interrupt to the main loop or function to get the desire traffic light turn to green. To adding the safety features, when the interrupt signal send to the port, all the traffic light will turn to yellow before the desire traffic light turn green. This to avoid the others involved into crash and give more trouble to the emergency vehicles. 

I have planned to alter a bit the program from using timer to using the other interrupt signal to off the interrupt cycle because if the vehicles not pass the junction but the traffic light already turn to red, it just like others system and reduces the efficiency of the system.

Schematic diagram

 PCB board

Construct PCB board

Etching PCB process 

Drilling hole for component