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Step 1: Parts List
1. transistors bc 547 = 2
2. variable resistor 10k =2
3. light dependent resistor =2
4.printed circuit board
5. battery i used 3.7 volt
6. diy robot chassis
take a pcb and fix all components according to circuit
here is the circuit diagram
this is the circuit (without sensors)
solder them carefully
Add ldrs to both channels
Time to use our diy robot chassis.add that circuit on it.