IDUINO for Maker’s life
www.openplatform.cc
Rotary Encode Module (SE055)
1 Introduction
Rotary encoder is a rotary input device (as in knob) that provides an indication of how
much the knob has been rotated AND what direction it is rotating in.It’s a great device
for stepper and servo motor control. You could also use it to control devices like
digital potentiometers.
Specification
Operation voltage: 5V
5Pinout
Size:32*20*30mm
Weight: 8g
2 Pinout
Pin
Description
CLK
Encoder A
DT
Encoder B
SW
Switch button
+
Power(5V DC)
Gnd
Ground
3.Example
This is a simple sketch that shows how to count the encoder position and how to
determine direction of rotation. It has no switch debounce, nor does it use interrupts.
A fully developed application might need to incorporate these in order to make it
robust.
IDUINO for Maker’s life
www.openplatform.cc
******Code Begin******
int pinA = 3; // Connected to CLK
int pinB = 4; // Connected to DT
int encoderPosCount = 0;
int pinALast;
int aVal;
boolean bCW;
void setup() {
pinMode (pinA,INPUT);
pinMode (pinB,INPUT);
/* Read Pin A
Whatever state it's in will reflect the last position
*/
pinALast = digitalRead(pinA);
Serial.begin (9600);
}
void loop() {
aVal = digitalRead(pinA);
if (aVal != pinALast){ // Means the knob is rotating
// if the knob is rotating, we need to determine direction
// We do that by reading pin B.
if (digitalRead(pinB) != aVal) { // Means pin A Changed first We're Rotating Clockwise
encoderPosCount ++;
IDUINO for Maker’s life
www.openplatform.cc
bCW = true;
} else {// Otherwise B changed first and we're moving CCW
bCW = false;
encoderPosCount--;
}
Serial.print ("Rotated: ");
if (bCW){
Serial.println ("clockwise");
}else{
Serial.println("counterclockwise");
}
Serial.print("Encoder Position: ");
Serial.println(encoderPosCount);
}
pinALast = aVal;
}
******Code End******
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