Prts you need:-
1.transistors bc 547 -2pc
2.variable resistor 10k -2pc
3.light dependent resistor -2pc
4.pcb
5.battery (i use 3.7v)
Step1:-take a pcb and fix all components according to circuit carefully.
step2;-here is the circuit diagram basically it is electronic transistor switch
step3;-solder components according to circuit diagram carefully
step4:-this is the circuit (without sensors)
step5:-Add ldrs to both channels
step6:-Time to use our diy robot chassis.add that circuit on it.
step7:-Thats it have fun with it.
thanks :)