Example Code for Arduino-Read 8421 Encoder Code

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• 8421_Encoder-Vertical x1
• Wires

Software Preparation

• Arduino IDE

Wiring Diagram

Sample Code

Upload the following codes to your mainboard, open the serial monitor.

/**************************************************************************/
/*
    @file       DFR0722_V10_Demo.ino
    @author     PowerLiao (DFRobot)
    @version    V1.0
    @date       2020-07-09
    @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
    @licence    The MIT License (MIT)
    @breif      This example read and print the 8421 encoder code.

    This demo and related libraries are for [DFR0722]8421 Encoder-Horizontal(V1.0)
    Check out the links below for tutorials and connection diagrams
    Product(CH): http://www.dfrobot.com.cn/
    Product(EN): https://www.dfrobot.com/

*/
/**************************************************************************/



#define setbit(data,b) (data|=(1<<b)) //set the b bit of data to 1
#define clrbit(data,b) (data&=~(1<<b)) //set the b bit of data to 0

uint8_t code8421 = 0;
const uint8_t code8Pin = 5;
const uint8_t code4Pin = 4;
const uint8_t code2Pin = 3;
const uint8_t code1Pin = 2;

void setup() {
  Serial.begin(115200);
  Serial.println("8421 Encoder Starts up!");
  pinMode(code8Pin, INPUT);
  pinMode(code4Pin, INPUT);
  pinMode(code2Pin, INPUT);
  pinMode(code1Pin, INPUT);
}

void loop() {
  //According to the pin level and set the corresponding bit to 0 or 1
  if (digitalRead(code8Pin) == HIGH){
    setbit(code8421, 3);
  }else{
    clrbit(code8421, 3);
  }

  if (digitalRead(code4Pin) == HIGH){
    setbit(code8421, 2);
  }else{
    clrbit(code8421, 2);
  }

  if (digitalRead(code2Pin) == HIGH){
    setbit(code8421, 1);
  }else{
    clrbit(code8421, 1);
  }

  if (digitalRead(code1Pin) == HIGH){
    setbit(code8421, 0);
  }else{
    clrbit(code8421, 0);
  }

  //Output the code in hexadecimal 
  Serial.print("Now code8421 is:  ");
  Serial.println(code8421, HEX);
  delay(1000);
}

Result

The module print out the current code value every 1 second.