Example Code for Arduino-Reset Encoder

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• Rotary Encoder Module (I2C) x 1
• Jumper wires

Software Preparation

• Arduino IDE
• Download and install the Rotary Encoder Module Library. (About how to install the library?)

Wiring Diagram

Other Preparation Work

Ensure the rotary encoder's I2C address is set to 0x54 via the DIP switches on the back of the module.I2C Setting Method

Sample Code

/*!
 * @file        setSensor.ino
 * @brief       Reset the encoder value to zero when the button is detected to be pressed
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license     The MIT License (MIT)
 * @author      [qsjhyy]([email protected])
 * @version     V1.0
 * @date        2021-09-15
 * @url         https://github.com/DFRobot/DFRobot_VisualRotaryEncoder
 */
#include <DFRobot_VisualRotaryEncoder.h>

/**
 * Instantiate an object to drive our sensor;
 * Set address according to encoder DIP switch:
 * | 1 | 2 | ADDR |
 * |---|---|------|
 * | 0 | 0 | 0x54 |
 * | 0 | 1 | 0x55 |
 * | 1 | 0 | 0x56 |
 * | 1 | 1 | 0x57 |
 */
DFRobot_VisualRotaryEncoder_I2C sensor(/*i2cAddr = */0x54, /*i2cBus = */&Wire);

void setup()
{
  Serial.begin(115200);// Init serial port 

  // Initialize the sensor
  while( NO_ERR != sensor.begin() ){
    Serial.println("Communication with device failed, please check connection");
    delay(3000);
  }
  Serial.println("Begin ok!");

  /**
   * Set the current gain factor of the encoder, accuracy value to rotate one detent
   * accuracy range：1~51，the minimum is 1 (light up one LED about every 2.5 turns), the maximum is 51 (light up one LED every one detent rotation)
   * gainValue range[1, 51], the setting is invalid when out of range.
   */
  sensor.setGainCoefficient(51);// The currently set accuracy value: 51

  /**
   * Get the current gain factor of the encoder, accuracy value to rotate one detent
   * accuracy range：1~51，the minimum is 1 (light up one LED about every 2.5 turns), the maximum is 51 (light up one LED every one detent rotation)
   * return value range: 1-51
   */
  uint8_t gainCoefficient = sensor.getGainCoefficient();
  Serial.print("Encoder current gain coefficient: ");
  Serial.println(gainCoefficient);

  Serial.println();
  delay(1000);
}

void loop()
{
  /**
   * Detect if the button is pressed
   * return true when the button pressed，otherwise, return false
   */
  if(sensor.detectButtonDown()){
    /**
     * Set the encoder count value
     * value range[0, 1023], the setting is invalid when out of range
     * In this example, set the encoder value to zero when detecting the button pressed, and you can see all the LEDs that light up before turning off
     */
    sensor.setEncoderValue(0);
  }

  /**
   * Get the encoder current count 
   * return value range： 0-1023
   */
  uint16_t encoderValue = sensor.getEncoderValue();
  Serial.print("The encoder current counts: ");
  Serial.println(encoderValue);

  Serial.println();
  delay(1000);
}

Result

Data on serial monitor: