File size: 1,653 Bytes
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TFT EtchASketch
This example for the Arduino screen draws a white point
on the GLCD based on the values of 2 potentiometers.
To clear the screen, press a button attached to pin 2.
This example code is in the public domain.
Created 15 April 2013 by Scott Fitzgerald
http://www.arduino.cc/en/Tutorial/TFTEtchASketch
*/
#include <TFT.h> // Arduino LCD library
#include <SPI.h>
// pin definition for the Uno
#define cs 10
#define dc 9
#define rst 8
// pin definition for the Leonardo
// #define cs 7
// #define dc 0
// #define rst 1
TFT TFTscreen = TFT(cs, dc, rst);
// initial position of the cursor
int xPos = TFTscreen.width() / 2;
int yPos = TFTscreen.height() / 2;
// pin the erase switch is connected to
int erasePin = 2;
void setup() {
// declare inputs
pinMode(erasePin, INPUT);
// initialize the screen
TFTscreen.begin();
// make the background black
TFTscreen.background(0, 0, 0);
}
void loop() {
// read the potentiometers on A0 and A1
int xValue = analogRead(A0);
int yValue = analogRead(A1);
// map the values and update the position
xPos = xPos + (map(xValue, 0, 1023, 2, -2));
yPos = yPos + (map(yValue, 0, 1023, -2, 2));
// don't let the point go past the screen edges
if (xPos > 159) {
(xPos = 159);
}
if (xPos < 0) {
(xPos = 0);
}
if (yPos > 127) {
(yPos = 127);
}
if (yPos < 0) {
(yPos = 0);
}
// draw the point
TFTscreen.stroke(255, 255, 255);
TFTscreen.point(xPos, yPos);
// read the value of the pin, and erase the screen if pressed
if (digitalRead(erasePin) == HIGH) {
TFTscreen.background(0, 0, 0);
}
delay(33);
}
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