1.transistor switch circuit .
2.relay switch :2
3.ir led and ir photo diode :2 pair
4.470 ohm resistor :4
5.diy robot chassis
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I build a sensor circuit with a pair of ir photo diode and ir led ( for each channel).
Here is the diagram of the circuit.in this circuit you can see that i motors are powered by separate battery.
Now final assembly of robot
And now lets test it.
This is not the most sophisticated robot but i am sure this is the easy to make robot.