Thnaks
Ok? thanks for the information.
One more thing, i am using PIC microcontroller to control the robot, i am stuck with the idea of HOW TO MAKE THE MICROCONTROLLER "UNDERSTAND"
THE INPUT SIGNAL, in other words, i want to measure the frequency of that signal so that the proper decision is made by the microcontroller since the robot has two IR transmitters (front and rear in order to detect front and back obstacles) , the result is to have two signals with two frequencies.
I hope that the idea is clear.
I am very thankfull to be helped.