Tutorial: Joystick shield with Arduino

The Joystick Shield is an Arduino add-on that has a 2 axis joystick and 5 buttons (one in the joystick). We can use it to control a lot of things that needs analog and digital commands. Here we have the circuit extracted from the datasheet):

Here we have a sample code, modified from here.

//Create variables for each button on the Joystick Shield to assign the pin numbers

char button0=3, button1=4, button2=5, button3=6;
char sel=2;

void setup(void)
{
pinMode(sel, INPUT); //Set the Joystick 'Select'button as an input
digitalWrite(sel, HIGH); //Enable the pull-up resistor on the select button

pinMode(button0, INPUT); //Set the Joystick button 0 as an input
digitalWrite(button0, HIGH); //Enable the pull-up resistor on button 0

pinMode(button1, INPUT); //Set the Joystick button 1 as an input
digitalWrite(button1, HIGH); //Enable the pull-up resistor on button 1

pinMode(button2, INPUT); //Set the Joystick button 2 as an input
digitalWrite(button2, HIGH); //Enable the pull-up resistor on button 2

pinMode(button3, INPUT); //Set the Joystick button 3 as an input
digitalWrite(button3, HIGH); //Enable the pull-up resistor on button 3

Serial.begin(9600); //Turn on the Serial Port at 9600 bps
}

void loop(void)
{
Serial.print(analogRead(0)); //Read the position of the joysticks X axis and print it on the serial port.
Serial.print(",");
Serial.print(analogRead(1)); //Read the position of the joysticks Y axis and print it on the serial port.
Serial.print(",");
Serial.print(digitalRead(sel)); //Read the value of the select button and print it on the serial port.
Serial.print(",");
Serial.print(digitalRead(button0)); //Read the value of the button 0 and print it on the serial port.
Serial.print(",");
Serial.print(digitalRead(button1)); //Read the value of the button 1 and print it on the serial port.
Serial.print(",");
Serial.print(digitalRead(button2)); //Read the value of the button 2 and print it on the serial port.
Serial.print(",");
Serial.println(digitalRead(button3)); //Read the value of the button 3 and print it on the serial port.

//Wait for 100 ms, then go back to the beginning of 'loop' and repeat.
delay(100);
}

Upload the code to your board and open the serial monitor. You will see the numbers as below:

Move the joystick around and watch the first 2 values changing. The following numbers represents the buttons. Push one of them and the value will become zero.

References:

http://www.sparkfun.com/products/9760

http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Dev/Arduino/Shields/...

http://www.sparkfun.com/Code/Joystick_Shield_Example.zip

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