The IR Line sensor

This is a 8 sensor array of iR sensors

The Sensor Array

The sensor board consists of 8 IR sensors. The sensors are placed 1.2 cm apart from each other.Two on oboard LM324 onboard convert the anaglog signals from the IR photodiode and convert them to digital signals. There is a onboard preset to calibrate the sensors. The sensor board PCB is shown below. I used EaglePCB for the designing because it is quite easy to learn and comes free. The sensor board is single sided so it should be possible to etch at home. Just print the board to size and etch it.

The above picture is of the silk side of the sensor array. Here you can clearly see how the components have been placed in the vero board. The symbols marked with "L#" represent respective IR diodes and the symbols marked with "PD#" represent the respective IR sensors.

The solder side of the above sensor module

You need to solder your vero board according to the above given layout. Just try to relate the layout with the silk side of the sensor module. Although this module has 8 sensors but in most of the competitions 3 sensors will suffice! One on the line. The other two on both sides of the line; the Left Sensor and the Right Sensor.