Servo Operation Issues

Projects Programming
1

I am encountering a weird error. My program is meant to rotate my servo to 90 degrees when I flick a switch one way, and rotate back up when I flick it the other way. I am doing this by running the arduino's 5 volts through the switch and into the 7th digital pin. When I turn it off, it waits around 8 seconds and then turns and it also grinds the gears. It rotates back when I flip the switch back. I am using a Generic (Sub-Micro) Servo from SparkFun.
Here is my code:

#include<Servo.h>
Servo my_servo;
int servo_state = 0;
int pos = 0;
void setup()
{
  my_servo.attach(12);
  pinMode(7,INPUT);
  my_servo.write(0);
  Serial.begin(9600);
}


void loop()
{
  
  if (digitalRead(7) == HIGH && servo_state == 0)
  {
    my_servo.write(90);
    delay(5);
    servo_state = 1;
  }
  if (digitalRead(7) == LOW && servo_state == 1)
  {
    my_servo.write(0);
    delay(5);
    servo_state = 0;
  }
  if (digitalRead(7) == HIGH)
  {
    Serial.print('high');
  }
  if (digitalRead(7) == LOW)
  {
    Serial.print('low');
  }
}

Is there anything in there that would be causing the servo delay? Or is this something to do with the hardware?

2

Or is this something to do with the hardware?

No. The problem is a floating pin. Wire your switch correctly to prevent it. One leg to the digital pin and one leg to ground, and turn on the internal pullup resistor (INPUT_PULLUP).

    Serial.print('high');

Would you post a picture of your keyboard, with the ONE key that you pressed to get the ONE character in single quotes there?

3

@PaulIS

So rather than having

pinMode(7,INPUT);

It is supposed to be like this?

pinMode(7,INPUT_PULLUP)

Also, what ONE character are you referring to?

5

Also, I think you need to allow more time for the servo to move to its new position. You seem only to be allowing 5 millisecs.

You should also consider reorganizing your code so there is only a single digitalRead(7) in loop().

Have a look at planning and implementing a program

...R

6

Two simple servo button setups.

//zoomkat servo button test 7-30-2011
//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;
Servo servo1;

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

void loop()
{
  press1 = digitalRead(button1);
  if (press1 == LOW)
  {
    servo1.write(160);
  }
  else {
    servo1.write(20);
  }
}

//zoomkat servo button test 7-30-2011

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

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

void loop()
{
  press1 = digitalRead(button1);
  if (press1 == LOW)
  {
    servo1.write(160);
    delay(2000);
    servo1.write(20);
  }
}