Referring to the table above, a gas sensor will operate when the analog output for the sensor is more than 2.1 volts,meanwhile obstacle sensor will detect the object in front of the robot when analog output is more than 1.6 volts.

Once the gas sensor detecting a liquefied petroleum gas or obstacle sensor detecting a barrier, the motor an buzzer will automatically switch off.

There will be 3 line sensor operating the system especially the motors. When line sensor 1 detecting a black line, both motor of the robot will be on. On the other hands, if line sensor 0 or line sensor 2 will control either motor 1 or motor 2 to move.