using 2 pots with 2 servos.

Forum 2005-2010 (read only) Hardware Interfacing
#1

Hello, I'm very new to arduino, servos, and writing code. All i would like to know, is how to control two servos separately with two different potentiometers. thanks!

#2

You can do that by modifying the knob.pde servo example sketch.

Add another potPin for the second pot, . In loop duplicate the three lines before the delay statement so they refer to the second pot and second servo.

#include <Servo.h> 
 
Servo myservo1;  // create servo object to control a servo 
Servo myservo2;  
 
int potpin1 = 0;  // analog pin used to connect the potentiometer
int potpin2 = 0; 
int val;    // variable to read the value from the analog pin 
 
void setup() 
{ 
  myservo1.attach(9);  // attaches the servo on pin 9 to the servo object 
  myservo2.attach(10);  // attaches the servo on pin 10 to the servo object 
} 
 
void loop() 
{ 
  val = analogRead(potpin1);            // reads the value of the potentiometer (value between 0 and 1023) 
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo1.write(val);                  // sets the servo position according to the scaled value 
  val = analogRead(potpin2);            // reads the value of the potentiometer (value between 0 and 1023) 
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo2.write(val);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
}
#3

gosh your smart... haha is there someplace on the web that teaches how to write code for the arduino from scratch? because i can't seem to find anything like that

#4

im new as well and want to have 4 servos controlled by 4 diffrent pots please help with the code.

thank you

#5

Untested:

#include <MegaServo.h>

#define N_SERVOS 4
#define FIRST_SERVO_PIN 2
#define FIRST_POT_PIN 0
Servo servo [N_SERVOS];  // create servo object to control a servo

void setup()
{
  for (int i = 0; i < N_SERVOS; ++i) {
    servo [i].attach(i + FIRST_SERVO_PIN); 
  }
}

void loop()
{
  for (int i = 0; i < N_SERVOS; ++i) {
    servo[i].write(map(analogRead(i + FIRST_POTPIN), 0, 1023, 0, 179) );  
    delay(15);
  }
}

Simples!

#6