Servo Directional Control Using Two Button Inputs

Question

I want a standard servo to rotate 180 degrees when button 1 is pressed and released. But I want the servo to rotate back to the initial position only when button 2 is being held down (& to stop rotating once button 2 is released). The arduino code I have now correctly allows the servo to make a full rotation 180 degrees with a press and release of button 1, but the servo also incorrectly rotates back to the initial position with a press and release of button 2 instead of stopping once released. Any help with the following code would be much appreciated:

#include <Servo.h>
Servo myservo;

int pos;

const int buttonPin = 2;
const int buttonPin2 = 3;
int buttonState = 0;
int buttonState2 = 0;

void setup()
{
  myservo.attach(9);

  pinMode(buttonPin, INPUT);
  pinMode(buttonPin2,INPUT);

}
void loop()

{

  buttonState = digitalRead(buttonPin);
  buttonState2 = digitalRead(buttonPin2); 

  if (buttonState == HIGH) {  
    pos=180;
    myservo.write(180);    

  }

  if (buttonState2 == HIGH) {  
    pos-=1;
    myservo.write(pos); 

  } 
}

Can you tell me what you get on a single press and release on button2.Dont press it for long just a sudden press and release.check it and update me — Mathews Sunny, May 18 '17 at 17:05

score 0 · Answer 1 · answered May 18 '17 at 17:51

0

You don't have any delay in your loop. Your pos-=1; line will be executed with high frequency, and the servo is not able to follow that.

A simple solution would be to introduce a short delay (e.g. delay(20);) after your myservo.write(pos); so the servo has some time to actually reach the new position.

answered May 18 '17 at 17:51

Laurenz

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`delay()` would avoid problem but its a bit deprecated use.Better to use `millis()` – Mathews Sunny May 18 '17 at 18:37
1

`delay()` is not deprecated and it does the job just fine. Obviously you don't get any concurrency, which is why in bigger projects you want to [avoid it](https://playground.arduino.cc/Code/AvoidDelay). But for this, it is just right IMO. – Laurenz May 18 '17 at 18:43
Yeah by deprecated i meant use of it is not well promoted.think tht sounds same – Mathews Sunny May 18 '17 at 18:45
Thanks to both of you. – wickedhurricane May 18 '17 at 18:53
If we could solve your problem, don't forget to mark one answer as solution :) – Laurenz May 18 '17 at 19:00

Servo Directional Control Using Two Button Inputs

1 Answers1