Please select other codes for this lecture from the links below.
Related or required files and link to this lesson
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.
/*
* 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);
}