Question

What is the purpose of the CLK pin in the rotary encoder?

(a) To provide pulse reference

(b) To power the module

(c) To shut down the module

(d) To provide analog reference voltage

I have been asked this question in my homework.

Origin of the question is Rotary Encoder in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

The correct option is (a) To provide pulse reference

For explanation: The rotary encoder has a CLK pin and a DATA pin. The DATA pin gives out pulses which vary in phase depending upon the direction of rotation of the rotary encoder. However we cannot determine these variations until we compare the wave pattern with another steady non-variable pulse train. The CLK pin provides exactly that.