arduino sketch to pan servo left and right

Other Hardware Motors, Mechanics, Power and CNC
1

This is my current sketch. When i try to insert negative degrees in reference to zero degrees it wont turn in the other direction. I need for the servo to start at zero stop at 90 and then turn past zero to -90deg
any suggestions? for a sketch would be greatly appreciated.
Thanks :slight_smile:

//Creating for loop

//Add the servo library. This library is standart library
#include <Servo.h>

//Define our servos
Servo servo1;
Servo servo2;
Servo servo3;
Servo servo4;
Servo servo5;
Servo servo6;

//servo position in degrees
int servoPos = 0;

void setup()
{
//Define serco signal inputs (Digital PWM 3-5-6-9-11)
servo1.attach(3);
servo2.attach(5);
servo3.attach(6);
servo4.attach(9);
servo5.attach(10);
servo6.attach(11);
}

void loop()
{

//scan from 0 to 180 degrees
for(servoPos = 0; servoPos < 90; servoPos++)
{
servo1.write(servoPos);
servo2.write(servoPos);
delay(100);
}

//now scan back from 180 to 0 degrees
for(servoPos =90; servoPos > 0; servoPos--)
{
servo1.write(servoPos);
servo2.write(servoPos);
delay(100);
}

//scan from 0 to 180 degrees
for(servoPos = 180; servoPos < 90; servoPos++)
{
servo1.write(servoPos);
servo2.write(servoPos);
delay(100);
}

//now scan back from 180 to 0 degrees
for(servoPos =90; servoPos > 0; servoPos--)
{
servo1.write(servoPos);
servo2.write(servoPos);
delay(100);
}
}

2

any suggestions?

//scan from 0 to 180 degrees
for(servoPos = 0; servoPos < 90; servoPos++)

Don't write comments that are patently false.

When i try to insert negative degrees in reference to zero degrees

Where in the documentation does it say the Servo methods accept negative values?

Use code tags

3

Try counting 90 as the centre (which it is) and sweeping from 90 to 180 and back then from 90 to 0 and back, a bit like the original sweep sketch does.

I suppose if you really insist on your original numbering you could always map -90 to 90 to 0 to 180...but I can't imagine why you would bother.

Steve