1 | /*
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2 |
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3 | TFT EtchASketch
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4 |
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5 | This example for the Arduino screen draws a white point
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6 | on the GLCD based on the values of 2 potentiometers.
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7 | To clear the screen, press a button attached to pin 2.
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8 |
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9 | This example code is in the public domain.
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10 |
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11 | Created 15 April 2013 by Scott Fitzgerald
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12 |
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13 | http://arduino.cc/en/Tutorial/TFTEtchASketch
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14 |
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15 | */
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16 |
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17 | #include <TFT.h> // Arduino LCD library
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18 | #include <SPI.h>
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19 |
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20 | // pin definition for the Uno
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21 | #define cs 10
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22 | #define dc 9
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23 | #define rst 8
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24 |
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25 | // pin definition for the Leonardo
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26 | // #define cs 7
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27 | // #define dc 0
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28 | // #define rst 1
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29 |
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30 | TFT TFTscreen = TFT(cs, dc, rst);
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31 |
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32 | // initial position of the cursor
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33 | int xPos = TFTscreen.width() / 2;
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34 | int yPos = TFTscreen.height() / 2;
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35 |
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36 | // pin the erase switch is connected to
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37 | int erasePin = 2;
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38 |
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39 | void setup() {
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40 | // declare inputs
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41 | pinMode(erasePin, INPUT);
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42 | // initialize the screen
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43 | TFTscreen.begin();
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44 | // make the background black
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45 | TFTscreen.background(0, 0, 0);
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46 | }
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47 |
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48 | void loop()
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49 | {
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50 | // read the potentiometers on A0 and A1
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51 | int xValue = analogRead(A0);
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52 | int yValue = analogRead(A1);
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53 |
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54 | // map the values and update the position
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55 | xPos = xPos + (map(xValue, 0, 1023, 2, -2));
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56 | yPos = yPos + (map(yValue, 0, 1023, -2, 2));
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57 |
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58 | // don't let the point go past the screen edges
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59 | if (xPos > 159) {
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60 | (xPos = 159);
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61 | }
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62 |
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63 | if (xPos < 0) {
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64 | (xPos = 0);
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65 | }
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66 | if (yPos > 127) {
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67 | (yPos = 127);
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68 | }
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69 |
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70 | if (yPos < 0) {
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71 | (yPos = 0);
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72 | }
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73 |
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74 | // draw the point
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75 | TFTscreen.stroke(255, 255, 255);
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76 | TFTscreen.point(xPos, yPos);
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77 |
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78 | // read the value of the pin, and erase the screen if pressed
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79 | if (digitalRead(erasePin) == HIGH) {
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80 | TFTscreen.background(0, 0, 0);
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81 | }
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82 |
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83 | delay(33);
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84 | }
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