User Manual

53
It is difficult to distinguish between the left turn and right turn when programming. However,
when using an oscilloscope to observe the left turn and right turn of a switch, you will find a
phase difference between the signals of the two output pins as shown below.
It shows that if output 1 and output 2 is high, then the switch rotates clockwise; if output 1 is
high and output 2 is low, then the switch rotates counterclockwise. As a result, during SCM
programming, if output 1 is high, then you can tell whether the rotary encoder turns left or
right as long as you know the state of output 2.
Experimental Procedures
Step 1: Build the circuit
Rotary Encoder Module SunFounder Uno
CLK -----------------------------------D2
DT ------------------------------------ D3
SW ------------------------------------ D4
+ -------------------------------------- 5V
- ------------------------------------- GND
SunFounder