Home Main Arduino Code Arduino Step by Step Course SunFounder's ESP32 Course

Back to Step by Step Course by Robojax

Lesson 97: Lesson 97: Controlling Servo Motor using Rotary Encoder and Display Angel On LCD

If you don't like to see ads while video is being played you can purchase YouTube premium Here

Lesson 97: Lesson 97: Controlling Servo Motor using Rotary Encoder and Display Angel On LCD

Please select other codes for this lecture from the links below.

Related or required files and link to this lesson

Part 9: Servo Motor

In this lesson we learn how to use a rotary encoder knob. Then we learn how to use it to control position of a servo motor (97-2) . In this lesson (97-3) we also display the position of servo motor on LCD screen using Arduino. This code will work with all Arduino board.
This code (97-2) demonstrating rotary encoder to control position of servo motor. When pressing the rotary encoder push button, it returns the servo to the home position. See video for demonstraiton.

  • 00:00 Introduction
  • 01:29 Project is explained
  • 03:04 Wiring Diagram and Wiring Explained
  • 10:36 Library Basic encoder Code Explained
  • 14:13 Demo: Basic Encoder
  • 15:21 Code: Encoder with switch explained
  • 16:44 Demo: Encoder with switch
  • 17:44 Code: Encoder with Servo and LCD
  • 27:25 Demp: Encoder with Servo and LCD

 /* 
 *  Lesson 97-2: Controlling Servo Motor using Rotary Encoder 

 *  
 *  Watch full details video: https://youtu.be/6xVLbNlmK-g
  This video is part of Arduino Step by Step Course which starts here: https://youtu.be/-6qSrDUA5a8
 

If you found this tutorial helpful, please support me so I can continue creating 
content like this. Make a donation using PayPal by credit card https://bit.ly/donate-robojax
  
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *  Updated by Ahamd Shamshiri on Jan 23, 2022
 *  Encoder Library - Basic Example
 * http://www.pjrc.com/teensy/td_libs_Encoder.html
 *
 * This example code is in the public domain.
 */
const int SW_PIN = 4;
const int PIN_A =2;
const int PIN_B =3;

#include <Encoder.h>

// Change these two numbers to the pins connected to your encoder.
//   Best Performance: both pins have interrupt capability
//   Good Performance: only the first pin has interrupt capability
//   Low Performance:  neither pin has interrupt capability
Encoder myEnc(PIN_A, PIN_B);
//   avoid using pins with LEDs attached

const int homePosition = 90; //initial position
const int stepValue = 5;
const int servoPin = 9;//must be a pin that that is labeled with ~
#include <Servo.h>

Servo myservo;  // create servo object to control a servo
int servoAngle =homePosition;

void setup() {
  Serial.begin(9600);
  pinMode(SW_PIN, INPUT);
  Serial.println("Basic Encoder Test:");
   myservo.attach(servoPin);  // attaches the servo on pin
   myservo.write(servoAngle);//move servo to initial position
}

long oldPosition  = -999;

void loop() {
  long newPosition = myEnc.read();
  if (newPosition != oldPosition) {

    if(newPosition >  oldPosition)
    {
    int newStep = abs(newPosition - oldPosition);
      Serial.print("Angle ");
      Serial.println(servoAngle);      
      servoAngle -= stepValue;
      if(servoAngle <0)
          servoAngle =0;      
      myservo.write(servoAngle);
    }

    if(newPosition <  oldPosition )
    {
    int newStep = abs(newPosition - oldPosition);
      Serial.print("Angle ");
      Serial.println(servoAngle);        
      servoAngle += stepValue;
      if(servoAngle >180)
          servoAngle =180;
      myservo.write(servoAngle);
    }
   oldPosition = newPosition;//remember the new position
  }

  if( digitalRead(SW_PIN) == LOW)
  {
    Serial.print("Home: ");
    Serial.println(homePosition);
    servoAngle =homePosition;
    myservo.write(servoAngle);
  
  }

//Watch full details video: https://youtu.be/6xVLbNlmK-g
  //delay(200);
}

The least I expect from you is to thumb up the video and subscribe to my channel. I appriciate that. .I have spent months making these lectures and writing code. You don't lose anything by subscribging to my channel. Your subscription is stamp of approval to my videos and more people can find them and in it turn it helps me. Thank you

If you found this tutorial helpful, please support me so I can continue creating content like this. support me via PayPal

**** AFFILIATE PROGRAM **** We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

Right Side
footer