The joystick is a great controller for controlling two potentiometers at one time.

/* Read Joystick
* ------------
*
* Reads two analog pins that are supposed to be
* connected to a joystick made of two potentiometers
*
* We send three bytes back to the comp: one header and two
* with data assigned to bytes, this will take the form:
*     Jxy\r\n
*
* x and y are integers and sent in ASCII
*
*/

int ledPin = 13;
int joyPin1 = 0; // slider variable connecetd to analog pin 0
int joyPin2 = 1; // slider variable connecetd to analog pin 1
int value1 = 0; // variable to read the value from the analog pin 0
int value2 = 0; // variable to read the value from the analog pin 1

void setup() {
pinMode(ledPin, OUTPUT); // initializes digital pins 0 to 7 as outputs
Serial.begin(9600);
}

int treatValue(int data) {
return (data * 9 / 1024) + 48;
}

void loop() {
// reads the value of the variable resistor
value1 = analogRead(joyPin1);
// this small pause is needed between reading
// analog pins, otherwise we get the same value twice
delay(100);
// reads the value of the variable resistor
value2 = analogRead(joyPin2);

digitalWrite(ledPin, HIGH);
delay(value1);
digitalWrite(ledPin, LOW);
delay(value2);
Serial.print('J');
Serial.print(treatValue(value1));
Serial.println(treatValue(value2));
}

Here again, you must use analog input pins in order for the circuit to work properly. In this case, the Joystick came from a kit created by KEYES sensors.

Keyes 023 joystick sensor. Not actual size.

Copyright Ken Rinaldo