Servo to complete desired rotation after button is pressed.

Projects Programming
1

Hey guys, I'm new at this so I apologize if it's been asked before. I know this is a noob question but I'm following a simple tutorial I found for a two button servo setup where one button makes the servo rotate clockwise and the other makes it rotate counter-clockwise. However right now, the servo only moves when the button is being pressed. How can I redo this code so that the servo will perform the rotation after merely a click of the button and not having to hold it down for the duration of the spin? I hope this explanation makes sense. The code is below.

#include <Servo.h>
const int buttonPin = 2;

const int buttonPin2 = 4;

int buttonState = 0;

int buttonState2 = 0;

Servo servoA;

int position = 0;


void setup() 
  {

  servoA.attach(9);

  pinMode(buttonPin, INPUT);

  pinMode(buttonPin2,INPUT);

  }

void loop() {

buttonState = digitalRead(buttonPin);

buttonState2 = digitalRead(buttonPin2);

if(buttonState ==HIGH && position < 180){

servoA.write(position++);

delay(5);

}

if(buttonState2 == HIGH && position > 3){

servoA.write(position--);

delay(5);

}

}
2

I answered a somewhat similar question recently here

You need to detect when the button changes from "not pressed" to "pressed" and then set your servo in motion.

If this does not make sense, let me know.

...R

3

Untested, I have no servos:

#include <Servo.h>
const int buttonPin1 = 2;
const int buttonPin2 = 4;
int buttonState1 = 0;
int buttonState2 = 0;
Servo servoA;
int position = 0;

void setup()
{
  servoA.attach(9);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
}

enum servoState {STOP, SEEK1, SEEK2};
servoState state = STOP;

void loop()
{
  // handle button 1
  if (digitalRead(buttonPin1) == HIGH and buttonState1 == LOW)
  {
    state = SEEK1;
    buttonState1 = HIGH;
    delay(10);
  }
  else if (digitalRead(buttonPin1) == LOW and buttonState1 == HIGH)
  {
    buttonState1 = LOW;
  }

 // handle button 2
  if (digitalRead(buttonPin2) == HIGH and buttonState2 == LOW)
  {
    state = SEEK2;
    buttonState2 = HIGH;
    delay(10);
  }
  else if (digitalRead(buttonPin2) == LOW and buttonState2 == HIGH)
  {
    buttonState2 = LOW;
  }

  // handle servos
  if (state == SEEK1 and position < 180)
  {
    servoA.write(position++);
    delay(5);
  }
  else if (state == SEEK2 and position > 3)
  {
    servoA.write(position--);
    delay(5);
  }
  else if (position <= 3 or position >= 180)
  {
    state = STOP;
  }
}
4

I found for a two button servo setup where one button makes the servo rotate clockwise and the other makes it rotate counter-clockwise. However right now, the servo only moves when the button is being pressed. How can I redo this code so that the servo will perform the rotation after merely a click of the button and not having to hold it down for the duration of the spin?

May be too simple for what you want.

//zoomkat servo button test 12-29-2011
// Powering a servo from the arduino usually *DOES NOT WORK*.

#include <Servo.h>
int button1 = 4; //button pin, connect to ground to move servo
int press1 = 0;
int button2 = 5; //button pin, connect to ground to move servo
int press2 = 0;
Servo servo1;

void setup()
{
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  servo1.attach(7);
  digitalWrite(4, HIGH); //enable pullups to make pin high
  digitalWrite(5, HIGH); //enable pullups to make pin high
}

void loop()
{
  press1 = digitalRead(button1);
  if (press1 == LOW)
  {
    servo1.write(170);
  }    
  
  press2 = digitalRead(button2);
  if (press2 == LOW)
  {
    servo1.write(10);
  }
}
5

aarg:
Untested, I have no servos:

#include <Servo.h>

const int buttonPin1 = 2;
const int buttonPin2 = 4;
int buttonState1 = 0;
int buttonState2 = 0;
Servo servoA;
int position = 0;

void setup()
{
  servoA.attach(9);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
}

enum servoState {STOP, SEEK1, SEEK2};
servoState state = STOP;

void loop()
{
  // handle button 1
  if (digitalRead(buttonPin1) == HIGH and buttonState1 == LOW)
  {
    state = SEEK1;
    buttonState1 = HIGH;
    delay(10);
  }
  else if (digitalRead(buttonPin1) == LOW and buttonState1 == HIGH)
  {
    buttonState1 = LOW;
  }

// handle button 2
  if (digitalRead(buttonPin2) == HIGH and buttonState2 == LOW)
  {
    state = SEEK2;
    buttonState2 = HIGH;
    delay(10);
  }
  else if (digitalRead(buttonPin2) == LOW and buttonState2 == HIGH)
  {
    buttonState2 = LOW;
  }

// handle servos
  if (state == SEEK1 and position < 180)
  {
    servoA.write(position++);
    delay(5);
  }
  else if (state == SEEK2 and position > 3)
  {
    servoA.write(position--);
    delay(5);
  }
  else if (position <= 3 or position >= 180)
  {
    state = STOP;
  }
}

Amazing! It worked. Thanks so much!

6

Adjustify:
Amazing! It worked. Thanks so much!

There is nothing amazing about it. @aarg gives good advice :slight_smile:

...R