Nuts and Volts - June 2014

void setup()
{
  // attaches the servo on pin
  // 9 to the servo
  myservo.attach(9);
 
  // initialize the serial
  // communication:
  Serial.begin(57600);
  Serial.flush();
  Serial.println(“Voltage
control servo Angle 1.0”);
}
 
void loop()
{
  if(Serial.available())
  {
 char c = Serial.read();
 if(c == ‘r’)
 {
 // read the value from
 // the sensor:
 sensorValue =
 analogRead(sensorPin);
 
 Serial.print
 (“AnalogRead: “);
 Serial.print
 (sensorValue);
 Serial.print
 (“  Voltage: “);
 Serial.print(  ((5.0*
 (float)sensorValue)/
 1024.0), 3);

■ FIGURE 14: Voltage control servo photo.

//float val = (float) sensorValue;
//val = (float)map(val,0.0,1023.0,0.0,180.0);
int val = (float)sensorValue;
val = (float)map(val,0,1023,0.0,180);
 
Serial.print(“  Angle = “);
Serial.println(val);

 }
  }
}

❏ Compile and run the program.

❏ Open the Serial Monitor and sequentially move the jumper between each resistor, and send an ‘r’ to the Arduino between each move. ❏ Verify that you receive the text shown in