Example Code for Arduino-Direction & Interrupt Count

Hardware Preparation

• DFRduino UNO (or similar) x 1
• Incremental Photoelectric Rotary Encoder
• 2x 1K Resistor
• M-M/F-M/F-F Jumper wires

Software Preparation

• Arduino IDE, Click to Download Arduino IDE from Arduino®

Wiring Diagram

Other Preparation Work

	Note: NPN open collector output needs pull-up resistors for the oscilloscope display.

Sample Code

/*!
 * @file  SEN0230.ino
 * @brief  Two phase quadrature encoder(Incremental)
 * @n  To determine motor with encode （CW OR CCW）
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  Dongzi([email protected])
 * @version  V1.0
 * @date  2016-5-26
 */

#define  A_PHASE 2
#define  B_PHASE 3
unsigned int flagA = 0;  //Assign a value to the token bit
unsigned int flagB = 0;  //Assign a value to the token bit
/** *  */
void setup() {
  pinMode(A_PHASE, INPUT);
  pinMode(B_PHASE, INPUT);
  Serial.begin(9600);   //Serial Port Baudrate: 9600
  attachInterrupt(digitalPinToInterrupt( A_PHASE), interrupt, RISING); //Interrupt trigger mode: RISING
}
void loop() {

  Serial.print("CCW:  ");
  Serial.println(flagA);
  Serial.print("CW: ");
  Serial.println(flagB);
  delay(1000);// Direction judgement

}
void interrupt()// Interrupt function
{ char i;
  i = digitalRead( B_PHASE);
  if (i == 1)
    flagA += 1;
  else
    flagB += 1;
}

Result

Use the interruption to detect the rotation direction and count cylinder number.