02-03-2013, 11:38 AM
LINE FOLLOWING ROBOTIC VEHICLE THAT DOES NOT REQUIRE ANY MICROCONTROLLER INTERFACE OR PROGRAM
LINE FOLLOWING ROBOTIC.pdf (Size: 57.59 KB / Downloads: 33)
INTRODUCTION
The front of the car is fitted with an array of two pair of photo sensors, comprising of one IR transmitter and a photo diode in each which allows the car to detect a black path as well as any turns in the path. Colors that reflect light, such as white, produces a reflected output from the sensors whereas black color that absorbs would output low for the base drive of a pair of Darlington pair of transistors. We provide a path by pasting a black tape on a white floor. The reflected light is possible only when it is in path. Once it goes out of track/line the reflection stops and the corresponding transistor is deprived of base drive so one of the motor stops while the other continues to run to bring back the robot on the track. By reading the outputs from each of the two sensors, Darlington pair of transistors is biased. Two DC motors are connected to the collector of the transistor TIP122. The motors are able to turn the steering left or right, depending on what logic signal the sensor sends.