I wrote a program that changes the color and intensity of LED based on the joystick position. Just thought I would share the code with everyone who might be interested.
/*
Joystick Color
This program will control the color and color intensity of the RGB
LED based on the joystick position of the Esplora. Moving the joystick
left and right will determine the color intensity of blue. Moving up will
determine the color intensity of green. Moving down will determine the
color intensity of red. Pressing switch 1 will calibrate the joystick
position.
Created on 1 Jan 2014
by Scott Nguyen
*/
#include <Esplora.h>
int joyx; // initiates joyx variable for joystick X
int joyy; // initiates joyy variable for joystick Y
void setup() {
Serial.begin(9600); // begin serial communication baud rate 9600
}
void loop() {
int red; // initiates red
int green; // initials green
int blue; // initiates blue
int xpos; // initiates x position
int ypos; // initiates y position
int xdrift = Esplora.readJoystickX(); // takes joystick x readings and assigns to xdrift
int ydrift = Esplora.readJoystickY(); // takes joystick y readings and assigns to ydrift
do {
joyx = Esplora.readJoystickX(); // takes readings from joystick x position and assigns to joyx
xpos = joyx - xdrift; // calibrates xpos by accounting for x drift
xpos = constrain(xpos, -512, 512); // constrains xpos between -512 and 512 and reassigns ouput value to xpos
xpos = map(xpos, 512, -512, -255, 255); // maps xpos and reassigns it to xpos
Serial.print("\nX position: "); // serial prints header for x position
Serial.print(xpos); // serial prints xpos value
joyy = Esplora.readJoystickY(); // takes readings from joystick y position and assigns to joyy
ypos = joyy - ydrift; // calibrates ypos by accounting for y drift
ypos = constrain(ypos, -512, 512); // constrains ypos between -512 and 512 and reassigns output value to ypos
ypos = map(ypos, -512, 512, 255, -255); // maps ypos and reassigns it to ypos
Serial.print("\tY position: "); // serial prints header for y position
Serial.print(ypos); // serial prints ypos value
if(ypos < -1) { // if joystick moves down
red = ypos * -1; // y position value will be assigned to red and made positive
}
if(ypos > 1) { // if joystick moves up
green = ypos; // y position value will be assigned to green
}
if(xpos > 1) { // if joystick moves right
blue = xpos; // x position value will be assigned to blue
}
if(xpos < -1) { // if joystick moves left
blue = xpos * -1; // x position value will be assigned to blue and made positive
}
Esplora.writeRGB(red, green, blue); // writes values of the colors to RGB LED
delay(10); // delay 10 milliseconds
red = 0; // assigns 0 to red
blue = 0; // assigns 0 to blue
green = 0; // assigns 0 to green
} while(Esplora.readButton(SWITCH_1) == HIGH); //exit loops if switch 1 is pressed
}
I've been using the explora to practice embedded programming more rather than spending most of my time hooking things on breadboards. Best investment ever.
