| /* | |
| 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 | |
| */ | |
| // pin definition for the Uno | |
| // 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); | |
| } | |