How to make a servo do one sweep then stop until push button pressed again

Other Hardware Motors, Mechanics, Power and CNC
1

Hi, I realize controlling one servo with a simple push button shouldn't be too difficult, but I really need the servo to only sweep the 90 degrees and then back and stop, until I press a push button again. I have been searching and re-coding for a few days now but I can't get the single sweep. What I do have is my servo sweeping at the angles I would like and the push button working (I have attached an LED to assure that). The push button works to turn the servo off and on if I time the moment I press it at the exact moment the servo completes a sweep and before it starts the next one. I read a forum question that addressed this issue similarly, however it didn't help. I would appreciate the help tremendously! Thank you and the code is posted below.

#include <Servo.h> 
#define LED 13                       // the pin for the LED
#define BUTTON 7                     // the input pin where the pushbutton is connected
 
Servo myservo;                       // create servo object to control a servo 
                                     // a maximum of eight servo objects can be created 
                
int pos = 0;                         // variable to store the servo position 
int val = 0;                         // val will be used to store the state of the button
int old = 0;                         // variable stores the previous value of "val"
int state = 0;                       // 0 = LED state is off 1 = LED state is on

void setup() { 
  myservo.attach(9);                 // attaches the servo on pin 9 to the servo object 
  pinMode(LED, OUTPUT);              // tell Arduino LED is an output
  pinMode(BUTTON, INPUT);            // and BUTTON is an input
} 

void loop() 
{val = digitalRead(BUTTON);          // read input value and store it
                                      // check whether the input is HIGH(button pressed)
  if ((val == HIGH) && (old == LOW))
{ state = 1 - state;
  delay(50);
}
old = val ;
if (state == 1) {
 digitalWrite(LED,HIGH);              // turn LED ON
  for(pos = 0; pos < 90; pos += 1)     // goes from 0 degrees to 90 degrees 
  {                                   // in steps of 1 degree 
    myservo.write(pos);               // tell servo to go to position in variable 'pos' 
    delay(15);                        // waits 15ms for the servo to reach the position 
  } 
  for(pos = 90; pos>=1; pos-=1)       // goes from 90 degrees to 0 degrees 
  {                                
    myservo.write(pos);               // tell servo to go to position in variable 'pos' 
    delay(15);                        // waits 15ms for the servo to reach the position 
  } }else{
  digitalWrite(LED, LOW);
  }
}
2 
// Modified from Examples->Servo->Sweep
#include <Servo.h> 
 
Servo myservo;  // create servo object to control a servo 

const int ServoPin = 9;
const int ButtonPin = 8;
 
void setup() 
{ 
  pinMode(ButtonPin, INPUT_PULLUP);
  myservo.attach(ServoPin);  // attaches the servo on pin 9 to the servo object 
} 
 
 
void loop() 
{ 
  if (digitalRead(ButtonPin) == LOW) {
    for(int pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
    {                                  // in steps of 1 degree 
      myservo.write(pos);              // tell servo to go to position in variable 'pos' 
      delay(15);                       // waits 15ms for the servo to reach the position 
    } 
  }
}
3

When you press the button it needs to set a variable - for example moveServo = true;

The the servoSweep only happens if (moveServo == true) {

and at the end of the sweep moveServo = false; prevents any further movement until the button is pressed again.

...R

4

I am so happy! Thank you very much, very useful.