Overview

In this lesson, we will show how to use the IR control/receiver to control a DC motor. We use the OSOYOO UNO as the MCU board here, and the Osoyoo Model X motor driver is based on the L298N chip, if you plan on working with robots or just building things that move you’ll eventually need to learn how to control a DC motor. The Osoyoo Model X motor driver module is a simple way to achieve that.

Part List

Software Preparation

Arduino IDE(version 1.6.8 or later)

Arduino library: IRremote.h

Connection

Connect the Uno board, battery box, Voltage Meter and OSOYOO MODEL X motor dirver module according below connection diagram:

Connect the OSOYOO UNO and OSOYOO MODEL X motor driver module as below:

Uno R3 Board OSOYOO MODEL X motor driver module
D2 IN1
D4 IN2
D5 ENA
D6 ENB

Connect the S pin in IR receiver to D3 pin in UNO board, GND to GND, VCC to 5V, as the following photo :

Code Program

After above operations are completed, connect the Arduino board to your computer using the USB cable. The green power LED (labelled PWR) should go on.Open the Arduino IDE and choose corresponding board type and port type for you project. Then load up the following sketch onto your Arduino.

#include <IRremote.hpp>
#define IR_RECEIVE_PIN  3 //IR receiver Signal pin connect to Arduino pin D3
#define IN1  2   //K1、K2 motor direction
#define IN2  4     //K1、K2 motor direction
#define ENA  5    // Needs to be a PWM pin to be able to control motor speed ENA
#define ENB  6    // Needs to be a PWM pin to be able to control motor speed ENA
#define IR_ADVANCE       24       //code from IR controller “▲” button
#define IR_BACK          82       //code from IR controller “▼” button
enum DN
{
  GO_ADVANCE, //go ahead
  GO_BACK,//go back
  DEF
}Drive_Num=DEF;
bool stopFlag = true;//set stop flag
bool JogFlag = false;
uint16_t JogTimeCnt = 0;
uint32_t JogTime=0;
/*motor control*/
void go_back(int t)  //motor rotate clockwise –>robot go ahead
{
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  delay(t);
}
void go_ahead(int t) //motor rotate counterclockwise –>robot go back
{
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  delay(t);
}
void go_stop() //motor brake –>robot stop
{
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
}
/*set motor speed */
void set_motorspeed(int lspeed,int rspeed) //change motor speed
{
  analogWrite(ENA,lspeed);//lspeed:0-255
  analogWrite(ENB,rspeed);//rspeed:0-255
}
/**************detect IR code***************/
void do_IR_Tick()
{
  if(IrReceiver.decode())
  {
    uint16_t command = IrReceiver.decodedIRData.command;
    if(command==IR_ADVANCE)
    {
      Drive_Num=GO_ADVANCE;
    }
    else if(command==IR_BACK)
    {
        Drive_Num=GO_BACK;
    }
    command = 0;
    IrReceiver.resume();
  }
}
/**************car control**************/
void do_Drive_Tick()
{
    switch (Drive_Num)
    {
      case GO_ADVANCE:
            set_motorspeed(255,255);go_ahead(20);JogFlag = true;JogTimeCnt = 3;JogTime=millis();break;//if GO_ADVANCE code is detected, then go advance
           case GO_BACK:
            set_motorspeed(255,255);go_back(20);JogFlag = true;JogTimeCnt = 1;JogTime=millis();break;//if GO_BACK code is detected, then backward
      default:break;
    }
    Drive_Num=DEF;
   //keep current moving mode for  100 millis seconds
    if(millis()-JogTime>=100)
    {
      JogTime=millis();
      if(JogFlag == true)
      {
        stopFlag = false;
        if(JogTimeCnt <= 0)
        {
          JogFlag = false; stopFlag = true;
        }
        JogTimeCnt–;
      }
      if(stopFlag == true)
      {
        JogTimeCnt=0;
        go_stop();
      }
    }
}
void setup() {
  /******L298N******/
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(ENA, OUTPUT);
  pinMode(ENB, OUTPUT);
  IrReceiver.begin(IR_RECEIVE_PIN, DISABLE_LED_FEEDBACK);
}
void loop() {
  do_IR_Tick();
  do_Drive_Tick();
}


Running Result


A few seconds after the upload finishes, pull out the USB cable, put the 18650 batteries into the battery box, then power the OSOYOO UNO by the DC power supply head.