Measurement Of RPM Of DC Motor Using Arduino And IR LED

What is our requirement? Here we want to measure the rpm of DC motor. So we have to measure how many times a particular point on the rotor undergoes a full rotation within a minute. So we have to use a sensor to keep track of this data. If we are able to determine the time between two consecutive detection of fixed point then we can calculate the RPM easily. Suppose the time between two consecutive detection is ‘t millisecond(s)’ then In our project we have used infrared sensor (IR sensor) for detection of fixed point. This is all about the basic requirement. Now we will see the basic block diagram of the circuit we are going to make.”