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1  Using Arduino / Programming Questions / what does this mean 'val is not declared in this scope'? on: February 10, 2013, 03:07:49 am
Code:
#include <Servo.h>

// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

#include <Servo.h>
 
Servo myservo1;  // create servo object to control a servo
Servo myservo2;
Servo myservo3;
Servo myservo4;
 
int potpin1 = 0;  // analog pin used to connect the potentiometer
int potpin2 = 1;
int potpin3 = 2;
int potpin4 = 3;

int val1;    // variable to read the value from the analog pin
int val2;
int val3;
int val4;

void setup()
{
  myservo1.attach(3);  // attaches the servo on pin 9 to the servo object
  myservo1.attach(5);
  myservo1.attach(6);
  myservo1.attach(9);
}
 
void loop()
{
  val1 = analogRead(potpin1);            // reads the value of the potentiometer (value between 0 and 1023)
  (it comes here)
  val1 = 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
  delay(15);                             // waits for the servo to get there
  val2 = analogRead(potpin2);            // reads the value of the potentiometer (value between 0 and 1023)
  val2 = 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
  delay(15);                 
  val3 = analogRead(potpin3);            // reads the value of the potentiometer (value between 0 and 1023)
  val3 = 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
  delay(15);                 
  val4 = analogRead(potpin4);            // reads the value of the potentiometer (value between 0 and 1023)
  val4 = 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
  delay(15);                 
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