May Arduino execute sketch on power supply?

Hello,
I’m a total beginer, I don’t know hot to write any code. But I got this code from some tutorial online which is moving my servo motor the way I need after pressing the button.
Can you please tell me, how should the code be changed in order for the servo action to be executed once also when I plug in Arduino to power supply (like it’s executed now when I push the button). Now when I connect the power supply does nothing, the motor only works when I push the button.

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
#define servoPin 3 //~
#define pushButtonPin 2 

int angle =45;    // initial angle  for servo (beteen 1 and 179)
int angleStep =10;
const int minAngle = 45;
const int maxAngle = 50;

const int type =2;//watch video for details. Link is at the top of this code (robojax)

int buttonPushed =0;

void setup() {
  // Servo button demo by Robojax.com
  Serial.begin(9600);          //  setup serial
  myservo.attach(servoPin);  // attaches the servo on pin 3 to the servo object
  pinMode(pushButtonPin,INPUT_PULLUP);
   Serial.println("Robojax Servo Button ");
   myservo.write(angle);//initial position
}

void loop() {
  if(digitalRead(pushButtonPin) == LOW){
    buttonPushed = 1;
  }
   if( buttonPushed ){
  // change the angle for next time through the loop:
  angle = angle + angleStep;

    // reverse the direction of the moving at the ends of the angle:
    if (angle >= maxAngle) {
      angleStep = -angleStep;
        if(type ==1)
        {
            buttonPushed =0;                   
        }
    }
    
    if (angle <= minAngle) {
      angleStep = -angleStep;
       if(type ==2)
        {
            buttonPushed =0;       
        }
    }
    
    myservo.write(angle); // move the servo to desired angle
      Serial.print("Moved to: ");
      Serial.print(angle);   // print the angle
      Serial.println(" degree");    
  delay(200); // waits for the servo to get there
   }

  
}

What happens if you change this line:

int buttonPushed =0;

to this:

int buttonPushed =1;
1 Like

Now my servo motor runs whenever I press a button. How can I make it run once also when I plug in Arduino to the power supply?
Thank you!

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
#define servoPin 3 //~
#define pushButtonPin 2 

int angle =45;    // initial angle  for servo (beteen 1 and 179)
int angleStep =10;
const int minAngle = 45;
const int maxAngle = 50;

const int type =2;//watch video for details. Link is at the top of this code (robojax)

int buttonPushed =0;

void setup() {
  // Servo button demo by Robojax.com
  Serial.begin(9600);          //  setup serial
  myservo.attach(servoPin);  // attaches the servo on pin 3 to the servo object
  pinMode(pushButtonPin,INPUT_PULLUP);
   Serial.println("Robojax Servo Button ");
   myservo.write(angle);//initial position
}

void loop() {
  if(digitalRead(pushButtonPin) == LOW){
    buttonPushed = 1;
  }
   if( buttonPushed ){
  // change the angle for next time through the loop:
  angle = angle + angleStep;

    // reverse the direction of the moving at the ends of the angle:
    if (angle >= maxAngle) {
      angleStep = -angleStep;
        if(type ==1)
        {
            buttonPushed =0;                   
        }
    }
    
    if (angle <= minAngle) {
      angleStep = -angleStep;
       if(type ==2)
        {
            buttonPushed =0;       
        }
    }
    
    myservo.write(angle); // move the servo to desired angle
      Serial.print("Moved to: ");
      Serial.print(angle);   // print the angle
      Serial.println(" degree");    
  delay(200); // waits for the servo to get there
   }

  
}

Move the code that moves the servo to the end of setup()

add a Boolean variable runOncethat you set to true initially and modify the button test to also consider this variable. and set it to false for the future

int angle =45;    // initial angle  for servo (beteen 1 and 179)
int angleStep =10;
const int minAngle = 45;
const int maxAngle = 50;

const int type =2;//watch video for details. Link is at the top of this code (robojax)
bool runOnce = true; // run upon boot

...

void loop() {
  if ((digitalRead(pushButtonPin) == LOW) || runOnce) {
    runOnce = false;
    ...

if you only want to set the servo to a given angle, just write that at the end of the setup

Your duplicate topics have been merged

Cross-posting is against the rules of the forum. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend 15 minutes (or more) writing a detailed answer on this topic, without knowing that someone else already did the same in the other topic.

Repeated cross-posting will result in a timeout from the forum.

In the future, please take some time to pick the forum board that best suits the topic of your question and then only post once to that forum board. This is basic forum etiquette, as explained in the sticky “How to use this forum - please read.” post you will find at the top of every forum board. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

Take a look into this tutorial:

Arduino Programming Course

It is easy to understand and has a good mixture between explaining important concepts and example-codes to get you going. So give it a try and report your opinion about this tutorial.

best regards Stefan

1 Like

Put the code to be executed in a function and call the function whenever you want to move the servo. ie from setup() or as a reaction to a button press

Thank you but I don’t know how to do that, I’m a very beginer and don’t understand code at all :frowning:

I copied this code and it dosen’t work

I don’t know what is that code, and where to copy it since I don’t know any coding, I just got the Arduino as a gift for my birthday.

Oh my God it works, I can’t belive it was that simple! Thank you!!! :slight_smile:

it works but does not do what you want, that’s another issue :slight_smile:

the reason you don’t see the behaviour is because you depend on if( buttonPushed ){
Which is kinda useless since if it is pushed you know it by the previous test:
if(digitalRead(pushButtonPin) == LOW)

I have this Arduino code I found in a tutorial which moves the servo motor when I power on the Arduino and whenever I press the button. How can I reduce the code to eliminate the button part and just execute the motor command once when I plug the Arduino in?

I’m a very beginer so I don’t know anything about writing or reading code, I jut copy-pasted that code from a tutorial.
Thank you!

/*
 Controlling a servo with Push button with Arduino
 this is code #1 to control servo with push button by Robojax (Robojax.com )

code #1 when push button the servo goes from 0° to 180° (or set your angle) and returns back
    Watch video for code #1: https://youtu.be/fPrPRZlGdvA
 */

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
#define servoPin 3 //~
#define pushButtonPin 2 

int angle =45;    // initial angle  for servo (beteen 1 and 179)
int angleStep =10;
const int minAngle = 45;
const int maxAngle = 50;

const int type =2;//watch video for details. Link is at the top of this code (robojax)

int buttonPushed =1;

void setup() {
  // Servo button demo by Robojax.com
  Serial.begin(9600);          //  setup serial
  myservo.attach(servoPin);  // attaches the servo on pin 3 to the servo object
  pinMode(pushButtonPin,INPUT_PULLUP);
   Serial.println("Robojax Servo Button ");
   myservo.write(angle);//initial position
}

void loop() {
  if(digitalRead(pushButtonPin) == LOW){
    buttonPushed = 1;
  }
   if( buttonPushed ){
  // change the angle for next time through the loop:
  angle = angle + angleStep;

    // reverse the direction of the moving at the ends of the angle:
    if (angle >= maxAngle) {
      angleStep = -angleStep;
        if(type ==1)
        {
            buttonPushed =0;                   
        }
    }
    
    if (angle <= minAngle) {
      angleStep = -angleStep;
       if(type ==2)
        {
            buttonPushed =0;       
        }
    }
    
    myservo.write(angle); // move the servo to desired angle
      Serial.print("Moved to: ");
      Serial.print(angle);   // print the angle
      Serial.println(" degree");    
  delay(200); // waits for the servo to get there
   }

  
}

You topics on the same subject have been merged

Cross-posting is against the rules of the forum. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend 15 minutes (or more) writing a detailed answer on this topic, without knowing that someone else already did the same in the other topic.

Repeated cross-posting will result in a timeout from the forum.

In the future, please take some time to pick the forum board that best suits the topic of your question and then only post once to that forum board. This is basic forum etiquette, as explained in the sticky “How to use this forum - please read.” post you will find at the top of every forum board. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

Does anyone know how can I reduce the code to eliminate the button part and just execute the motor command once when I plug the Arduino in? :frowning:

put everything in the setup and leave the loop empty

(explain better what you want to see when arduino is plugged in)

/*
  Controlling a servo with Push button with Arduino
  this is code #1 to control servo with push button by Robojax (Robojax.com )

  code #1 when push button the servo goes from 0° to 180° (or set your angle) and returns back
    Watch video for code #1: https://youtu.be/fPrPRZlGdvA
*/

#include <Servo.h>

Servo Myservo;  // create servo object to control a servo
const byte ServoPin = 3; //~


int angle = 45;   // initial angle  for servo (beteen 1 and 179)
int angleStep = 10;
const int minAngle = 45;
const int maxAngle = 50;

void setup()
{
  // Servo button demo by Robojax.com
  Serial.begin(9600);          //  setup serial
  Myservo.attach(ServoPin);  // attaches the servo on pin 3 to the servo object

  Serial.println("Robojax Servo Button ");
  Myservo.write(angle);//initial position
}

void loop()
{
    // change the angle for next time through the loop:
    angle = angle + angleStep;

    // reverse the direction of the moving at the ends of the angle:
    if (angle >= maxAngle)
    {
      angleStep = -angleStep;
    }

    if (angle <= minAngle)
    {
      angleStep = -angleStep;
    }

    Myservo.write(angle); // move the servo to desired angle
    Serial.print("Moved to: ");
    Serial.print(angle);   // print the angle
    Serial.println(" degree");
    delay(200); // waits for the servo to get there
}

Thank you, I just tested this code but unfortunately does not work, the motor keeps moving non-stop after plug in, not just once :frowning:

(explain better what you want to see when arduino is plugged in)

I just want the motor cu execute the move once, after Arduino is plugged in. The same action it does when I push the button.