Well my website unfortunately is not online yet.... I am just using flikr for the time being. The DS touch screen is only about £7 or $10 so not going to make you bankrupt. I got mine off an old DS anyway.
Anyway, here is the code. It is very simple and very crude
The numbers are so strange because it is a third of the values I got from my touch screen. The values for the LEDs are also a bit strange (but do work for the LEDs I have) but if someone can improve upon them then I would be very grateful. I am going to have another look at this project in a week or so when I am not so busy and I then might get round to laser cutting my case for it.
/*
* ds_touch_screen_mood_light.PDE - Arduino sketch - approx 1552 bytes
* Read from a touch panel the touch position
* Then light up RGB LED using 3 split screen on Y and fading on X
*
* Hardware used:
* Resistive touch panel, 4 wire (DS touch screen)
* Arduino board, LEDs
*
* May 25th 2009
* by Robin Whitfield
*
* *********
* Original touch screen code:
* April 5th 2009
* by Marco Nicolato
* *********
*/
// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
// Touch panel wiring
//
//When looking at DS screen with connector bottom left they are in order going down as follows:
//TOP
//LEFT
//BOTTOM
//RIGHT
//
// Digital connections (used to drive power)
#define Lo 2 // LEFT to digital output 2
#define Bo 3 // BOTTOM to digital output 3
#define Ro 4 // RIGHT to digital output 4
#define To 5 // TOP to Digital output 5
// Analog connections (used to read the touch position)
#define Ti 3 // TOP also to analog input 3
#define Ri 4 // RIGHT also to analog input 4
//define the LED pins:
#define LEDR 9 //set LEDR as pin 8
#define LEDG 10 //set LEDG as pin 9
#define LEDB 11 //set LEDB as pin 10
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
// set initial touched position
int touchX = 0;
int touchY = 0;
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
void setup()
{
pinMode(LEDR, OUTPUT); //set all LED pins as output pins
pinMode(LEDG, OUTPUT); //"
pinMode(LEDB, OUTPUT); //"
}
void loop()
{
if (touched()) //if the screen is touched then...
{
if(touchY < 388) //if x touch position is less then 1/3 of screen then:
analogWrite(LEDB, touchX/4 -18); //write brightness to blue LED
else //if not, then:
if(touchY > 623) //if x touch position is more than 1/3 of screen then:
analogWrite(LEDR, touchX/4 -18); //write brightness to red LED
else //if not, then:
analogWrite(LEDG, touchX/4 -18); //write brightness to green led
}
}
// return TRUE if touched, and set coordinates to touchX and touchY
boolean touched()
{
boolean touch = false;
// Horizontal routine - set L to gnd and R to Vcc
// set L = ground
pinMode(Lo, OUTPUT);
digitalWrite(Lo, LOW);
// set R = Vcc
pinMode(Ro, OUTPUT);
digitalWrite(Ro, HIGH);
// T e B high impedance (input mode)
pinMode(To, INPUT);
pinMode(Bo, INPUT);
// wait a bit, then read from Top
delay(10);
touchX = analogRead(Ti);
// Vertical routine - set B to gnd and T to Vcc
// Set B = gnd
pinMode(Bo, OUTPUT);
digitalWrite(Bo, LOW);
// set T = Vcc
pinMode(To, OUTPUT);
digitalWrite(To, HIGH);
// R e L high impedance (input mode)
pinMode(Ro, INPUT);
pinMode(Lo, INPUT);
// wait a bit, then read from Right
delay(10);
touchY = analogRead(Ri);
// Only read touch if coords are below 1000 and above 0 (stops errors with certain screens)
if(touchX < 1000 and touchX > 0 and touchY < 1000 and touchY > 0)
touch = true;
return touch;
}
Yeah, crude I know. Any improvements would be welcomed and any ideas as how to advance the project would be great.
Mowcius
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