Arduino Starter Series - The Mood Cue

Arduino Aug 19, 2015

This is a project from my Arduino starter series.

In this project I'm going to make the Mood Cue project from the Arduino Projects Book. This project is ideal for beginners . Enjoy!

Project Requirements
  • Arduino Uno/Duemilanove/Diecimila
  • USB cable to program Arduino
  • Breadboard
  • A Servo Motor
  • Two 100 uF Capacitors
  • One Potentiometer
  • Wires to power the components on the breadboard
The Breadboard Setup

The Mood Cue Breadboard Setup

The Code

As usual I've commented the code and provided reference to websites for further reading

// We need to include the Servo library since we're using a servo in this sketch
#include <Servo.h> 
// We need to create a servo instance and set a pin to be used by the Servo
Servo deciderServo;
const int servoPin = 9;

// We also need to define some variables that will be used to operate the potentiometer
const int potPin = A0; // We connect the potentiometer to analog pin A0
int potValue; // This will store the value from the potentiometer when we rotate it
int angle; // This variable will store the converted potentiometer value in degrees

// Setup functionality
void setup() {
  deciderServo.attach(servoPin); // The servo gets attached to the servo pin defined
  Serial.begin(9600); // In order for us to debug the potValue and angle variables we connect the Serial monitor on BAUD 9600

// Loop functionality
void loop() {
  // The first thing we need to do is read the value from the potentiometer
  potValue = analogRead(potPin); // We use the analogRead function passing in the pin for the potentiometer

  // We then print this value out to Serial so we can see it in the Serial Monitor
  Serial.print("Potentiometer Value: ");

  // Next we use the map function to convert the potentiometer value into degrees
  // The map function scales numbers doing all the heavy lifting for you converting
  // any value between 0 and 1024 to a value between 0 and 180
  // We store this value in our angle variable which will be used to control the servo
  // Read more about the map function here:
  angle = map(potValue, 0, 1024, 0, 180);

  // We then print the angle to the Serial Monitor
  Serial.print(", Servo angle: ");

  // We write the angle value to the servo using the write function
  // the write function accepts a value in degrees and angle is a degrees value
  // Read more about the Servo library here:

  // Lastly we need to delay the loop function by a few milliseconds to give
  // the servo a chance to complete its physical movement. I'd suggest playing 
  // with this value a bit, it will give you an idea of why this is necessary

This project is available on my Github Page

Nicholas Bester

I have 15 years of experience in design, development and implementation of digital marketing solutions ranging from virtual reality, 3D projection mapping, mobile apps and massive web platforms.