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