As I mention previously, the infrared sensor is to detect the obstacle when the robot start to walk and it will send a message to the motor to move the robot as to avoid from any obstacle ahead.
Below is the picture of the circuit:~
Print view of circuit schematic.
Circuit Schematic for Sensor designed in Proteus
Back view of the PCB after solder.
Sensor Circuit (The Obstacle sensor is still unattached)
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