In this lab, we’ll control a servomotor’s position using the value returned from an analog sensor. Servos are the easiest way to start making motion with a microcontroller. Even though they don’t turn 360 degrees, you can use them to create all sorts of periodic or reciprocating motions.
The Lab:
The Arduino Code:
#include <Servo.h> //include the servo library
Servo servoMotor; //creates an instance of the servo object to control a servo
int servoPin = 2; //control pin for servo motor
void setup() {
Serial.begin(9600); //initialize serial communications
servoMotor.attach(servoPin); //attached the servo on pin 2 to the servo object
}
void loop(){
int analogValue = analogRead(A0); //read the analog input
Serial.println(analogValue); //print it
//if your sensor’s range is less than 0 to 1023, you’ll need to
//modify the map() function to use the values you discovered;
int servoAngle = map(analogValue, 0, 1023, 0, 179);
servoMotor.write (servoAngle);
}
The Result: