Am achizitionat de pe ebay un ecran grafic inclusiv partea de touch rezisitv:
Desi pe vanzatorul indicata o pagina unde s-ar fi aflat librarii utile si sketch-uri, acestea nu au functionat, asa ca am gasit articolul A 2.4″ TFT TOUCHSCREEN SHIELD FOR ARDUINO de pe site-ul http://www.smokeandwires.co.nz/.
Ecranul de pe shield are driver-ul ST7781 si pentru a-l face functional, cei de la Smoke and Wires au modificat libraria Adafruit-TFTLCD realizand astfel libraria SWTFT. Aceasta librarie lucreaza impreuna cu libraria Adafruit GFX, iar partea de ecran tactil lucreaza cu libraria Touch-Screen, tot de la Adafruit.
Primul lucru care m-a deranjat este acela ca foloseste aproape toti pinii lui Arduino Uno, liber este doar A5 pe partea de analogic, iar pe digital doar D0 si D1 sunt liberi, care sunt folositi de interfata USB, de fapt. Dintre acestia, 4 sunt folositi pentru cardul SD (D10, D11, D12 si D13), deci as putea face un shield intermediar pentru a putea folosi acesti pini sau sa-i deconectez mecanic (intrerupere circuite), deoarece ma gandeam sa fac un termostat de centrala cu butoane virtuale...
Prima data am incarcat sketch-urile din exemplele librariei modificate, facand un filmulet numit afisaj color de 2,4" cu touch rezistiv si Arduino
Am facut si niste poze ale ecranului si a informatiilor de pe el:
Pentru a intelege sketch-urile si librariile folosite, am inceput sa le fac mici modificari, dupa cum apare in filmuletul afisaj color de 2,4" cu touch rezistiv si Arduino (2)
// Original code provided by Smoke And Wires
// http://www.smokeandwires.co.nz
// This code has been taken from the Adafruit TFT Library and modified
// by us for use with our TFT Shields / Modules
// For original code / licensing please refer to
// https://github.com/adafruit/TFTLCD-Library
// adapted sketch by niq_ro from http://arduinotehniq.blogspot.com/
// ver. 1m5 - 13.11.2014, Craiova - Romania
#include <Adafruit_GFX.h> // Core graphics library
#include "SWTFT.h" // Hardware-specific library
// The control pins for the LCD can be assigned to any digital or
// analog pins...but we'll use the analog pins as this allows us to
// double up the pins with the touch screen (see the TFT paint example).
// #define LCD_CS A3 // Chip Select goes to Analog 3
// #define LCD_CD A2 // Command/Data goes to Analog 2
// #define LCD_WR A1 // LCD Write goes to Analog 1
// #define LCD_RD A0 // LCD Read goes to Analog 0
// #define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin
// When using the BREAKOUT BOARD only, use these 8 data lines to the LCD:
// For the Arduino Uno, Duemilanove, Diecimila, etc.:
// D0 connects to digital pin 8 (Notice these are
// D1 connects to digital pin 9 NOT in order!)
// D2 connects to digital pin 2
// D3 connects to digital pin 3
// D4 connects to digital pin 4
// D5 connects to digital pin 5
// D6 connects to digital pin 6
// D7 connects to digital pin 7
// For the Arduino Mega, use digital pins 22 through 29
// (on the 2-row header at the end of the board).
#include <Adafruit_GFX.h> // Core graphics library
#include <SWTFT.h> // Hardware-specific library
#include <TouchScreen.h>
#define YP A1 // must be an analog pin, use "An" notation!
#define XM A2 // must be an analog pin, use "An" notation!
#define YM 7 // can be a digital pin
#define XP 6 // can be a digital pin
#define TS_MINX 150
#define TS_MINY 120
#define TS_MAXX 920
#define TS_MAXY 940
// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// For the one we're using, its 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
// Assign human-readable names to some common 16-bit color values:
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
//#define ROZ 0xFD20
#define ROZ 0xFBE0
#define GRI 0xBDF7
// http://stackoverflow.com/questions/13720937/c-defined-16bit-high-color
// http://wiibrew.org/wiki/U16_colors
SWTFT tft;
#define BOXSIZE 40
#define PENRADIUS 3
int oldcolor, currentcolor;
int ics;
void setup(void) {
Serial.begin(9600);
Serial.println(F("Paint!"));
tft.reset();
uint16_t identifier = tft.readID();
Serial.print(F("LCD driver chip: "));
Serial.println(identifier, HEX);
tft.begin(identifier);
tft.fillScreen(BLACK);
tft.fillRect(0, 0, 320, 240, BLACK);
tft.setRotation(3);
tft.setCursor(30, 100);
tft.setTextColor(RED); tft.setTextSize(3);
tft.println("LCD driver chip: ");
tft.setCursor(100, 150);
tft.setTextColor(BLUE);
tft.println(identifier, HEX);
delay(2000);
tft.fillRect(0, 0, 320, 240, BLACK);
tft.setRotation(0);
tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
tft.fillRect(0, BOXSIZE, BOXSIZE, BOXSIZE, YELLOW);
tft.fillRect(0, BOXSIZE*2, BOXSIZE, BOXSIZE, GREEN);
tft.fillRect(0, BOXSIZE*3, BOXSIZE, BOXSIZE, CYAN);
tft.fillRect(0, BOXSIZE*4, BOXSIZE, BOXSIZE, BLUE);
tft.fillRect(0, BOXSIZE*5, BOXSIZE, BOXSIZE, MAGENTA);
tft.fillRect(0, BOXSIZE*6, BOXSIZE, BOXSIZE, GRI);
tft.fillRect(0, BOXSIZE*7, BOXSIZE, BOXSIZE, ROZ);
//tft.fillRect(BOXSIZE, BOXSIZE, BOXSIZE, BOXSIZE, WHITE);
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
currentcolor = RED;
cifre (WHITE);
pinMode(13, OUTPUT);
}
#define MINPRESSURE 10
#define MAXPRESSURE 1000
void loop()
{
digitalWrite(13, HIGH);
// Recently Point was renamed TSPoint in the TouchScreen library
// If you are using an older version of the library, use the
// commented definition instead.
// Point p = ts.getPoint();
TSPoint p = ts.getPoint();
digitalWrite(13, LOW);
// if sharing pins, you'll need to fix the directions of the touchscreen pins
//pinMode(XP, OUTPUT);
pinMode(XM, OUTPUT);
pinMode(YP, OUTPUT);
//pinMode(YM, OUTPUT);
// we have some minimum pressure we consider 'valid'
// pressure of 0 means no pressing!
if (p.z > MINPRESSURE && p.z < MAXPRESSURE) {
/*
Serial.print("X = "); Serial.print(p.x);
Serial.print("\tY = "); Serial.print(p.y);
Serial.print("\tPressure = "); Serial.println(p.z);
*/
if (p.y < (TS_MINY-5)) stergere();
// scale from 0->1023 to tft.width
p.x = tft.width()-(map(p.x, TS_MINX, TS_MAXX, tft.width(), 0));
p.y = tft.height()-(map(p.y, TS_MINY, TS_MAXY, tft.height(), 0));
/*
Serial.print("("); Serial.print(p.x);
Serial.print(", "); Serial.print(p.y);
Serial.println(")");
*/
if (p.x < BOXSIZE) {
oldcolor = currentcolor;
if (p.y < BOXSIZE) {
currentcolor = RED;
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*2) {
currentcolor = YELLOW;
tft.drawRect(0, BOXSIZE, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*3) {
currentcolor = GREEN;
tft.drawRect(0, BOXSIZE*2, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*4) {
currentcolor = CYAN;
tft.drawRect(0, BOXSIZE*3, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*5) {
currentcolor = BLUE;
tft.drawRect(0, BOXSIZE*4, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*6) {
currentcolor = MAGENTA;
tft.drawRect(0,BOXSIZE*5, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*7) {
currentcolor = GRI;
tft.drawRect(0,BOXSIZE*6, BOXSIZE, BOXSIZE, WHITE);
// text (currentcolor);
} else if (p.y < BOXSIZE*8) {
currentcolor = ROZ;
tft.drawRect(0,BOXSIZE*7, BOXSIZE, BOXSIZE, WHITE);
stergere();
}
text (currentcolor);
//cifre (currentcolor);
if (oldcolor != currentcolor) {
if (oldcolor == RED) tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
if (oldcolor == YELLOW) tft.fillRect(0, BOXSIZE, BOXSIZE, BOXSIZE, YELLOW);
if (oldcolor == GREEN) tft.fillRect(0, BOXSIZE*2, BOXSIZE, BOXSIZE, GREEN);
if (oldcolor == CYAN) tft.fillRect(0, BOXSIZE*3, BOXSIZE, BOXSIZE, CYAN);
if (oldcolor == BLUE) tft.fillRect(0, BOXSIZE*4, BOXSIZE, BOXSIZE, BLUE);
if (oldcolor == MAGENTA) tft.fillRect(0, BOXSIZE*5, BOXSIZE, BOXSIZE, MAGENTA);
if (oldcolor == GRI) tft.fillRect(0, BOXSIZE*6, BOXSIZE, BOXSIZE, GRI);
if (oldcolor == ROZ) tft.fillRect(0, BOXSIZE*7, BOXSIZE, BOXSIZE, ROZ);
cifre (currentcolor);
}
}
// if (((p.y-PENRADIUS) > BOXSIZE) && ((p.y+PENRADIUS) < tft.height())) {
/*
if (((p.y-PENRADIUS) > 5) && ((p.y+PENRADIUS) < tft.height())) {
tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
}
*/
if (((p.x-PENRADIUS) > BOXSIZE) && ((p.x+PENRADIUS) < tft.width())) {
tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
}
}
}
void text (int culoare)
{
tft.setRotation(3);
tft.setCursor(70, 80);
tft.setTextColor(culoare); tft.setTextSize(5);
/* tft.println("niq_ro");
tft.setCursor(12, 130); tft.setTextSize(3);
tft.println("www.tehnic.go.ro");
tft.setCursor(20, 165); tft.setTextSize(2);
tft.println("nicuflorica.blogspot.ro");
*/
tft.setCursor(5, 220); tft.setTextSize(2);
tft.println("arduinotehniq.blogspot.com");
tft.setRotation(0);
}
void cifre (int culoare)
{
// number for "buttons"
tft.setRotation(3);
tft.setTextColor(culoare);
tft.setTextSize(3);
tft.drawLine(0, 0, 40, 40, culoare);
tft.drawLine(0, 40, 40, 0, culoare);
// tft.setCursor(15, 10);
// tft.println("1");
tft.setCursor(55, 10);
tft.println("1");
tft.setCursor(95, 10);
tft.println("2");
tft.setCursor(135, 10);
tft.println("3");
tft.setCursor(175, 10);
tft.println("4");
tft.setCursor(215, 10);
tft.println("5");
tft.setCursor(255, 10);
tft.println("6");
tft.setCursor(295, 10);
tft.println("7");
tft.setRotation(0);
}
void stergere ()
{
Serial.println("erase");
// press the bottom of the screen to erase
// tft.fillRect(0, BOXSIZE, tft.width(), tft.height()-BOXSIZE, BLACK);
tft.fillRect(0, 0, 240, 320, BLACK);
tft.setRotation(0);
tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
tft.fillRect(0, BOXSIZE, BOXSIZE, BOXSIZE, YELLOW);
tft.fillRect(0, BOXSIZE*2, BOXSIZE, BOXSIZE, GREEN);
tft.fillRect(0, BOXSIZE*3, BOXSIZE, BOXSIZE, CYAN);
tft.fillRect(0, BOXSIZE*4, BOXSIZE, BOXSIZE, BLUE);
tft.fillRect(0, BOXSIZE*5, BOXSIZE, BOXSIZE, MAGENTA);
tft.fillRect(0, BOXSIZE*6, BOXSIZE, BOXSIZE, GRI);
tft.fillRect(0, BOXSIZE*7, BOXSIZE, BOXSIZE, ROZ);
//tft.fillRect(BOXSIZE, BOXSIZE, BOXSIZE, BOXSIZE, WHITE);
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
currentcolor = RED;
cifre (WHITE);
}
Am facut si un filmulet numit afisaj color de 2,4" cu touch rezistiv si Arduino (4) care prezinta modul de comportare al programului si ce se poate face cu el:
