Help with servo!

Forum 2005-2010 (read only) General Frequently-Asked Questions
#1

Hi!
I need a little help with a servo.
What i want to do is that when i push a button, the servo goes from 0- 180 degrees.( in slow motion)
Than some delay, before it returns back to its starting position (0)

I hope someone understands me :wink:

My code till now looks like this :

int inputPin1 = 2;
#include <Servo.h> 
 
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 
 

void setup() {
 pinMode(inputPin1, INPUT); 
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
}

void loop(){
  if (digitalRead(inputPin1) == LOW) 
  {
     myservo.write(0-180);

  }
}

HELP :-?

#2

Here is the solution ot a similar problem: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1276899740/all#14

(I'm just to lazy to retype it)

Korman

#3

Thanks Korman, but i dont quite understand everything there ::) CAn somebody figure it out ? :-[

#4 
myservo.write(0-180);

I'm not sure that the write method accepts negative angles.

#5

You probably need to start with the below servo sweep example and incorporate a button function.

http://arduino.cc/en/Tutorial/Sweep

#6

Step 1: Make you program work so that the servo moves at full speed but with a delay between the movements. Step 2: Replace Servo.h with VarSpeedServo.h and write by slowmove -- or -- Step 2 alternative: Add the code from Servo Sweep mentioned by Zoomcat. Step 3: Have a merry Christmas with your slow servo sweeper.

But anyway, you need to start with Step 1 and fix your program to do what you want (although just at full speed)

Korman

#7

You are close… you have the logic for detecting the button press, you just need to fill in the logic to move the servo.

try replacing this line:

myservo.write(0-180);

with:

int deg;

for (deg = 0; deg <= 180; ++deg) { // go from 0 - 180
myserver.write(deg); // set the servo to that degree
delay(50); // bigger = slower sweep
}
for (deg = 180; deg >= 0; --deg) { // go from 180 - 0
myserver.write(deg); // same thing, but going down
delay(50);
}

That should do what you want, good luck!

#8

Thanx for answers.

I will try this soon, and leave feedback. ::)

#9