Hello,
I'm building a display for my Netatmo weather station like this one. I'm not a power user, more a beginer 
For a cost problem, I bought two Kuman Ecran Tactile UNO R3 3.5 TFT (Photos at the bottom of the post)
I'm using an ELEGOO Carte Mega 2560 R3 ATmega2560 ATMEGA . (and I succed to have WeMOS Mega + WiFi R3 ATmega2560 + ESP8266 working to grab Netatmo data using a php script, this works great, but I don't have yet connected the TFT on it, juste on the Elegoo Mega).
In Shield mode, one TFT works fine, I wired it to a breadboard using shield mode for Pin connexion.
I'm using a test example found in the mini dvd provided with the screen.
Here the code :
#include <SPI.h> // f.k. for Arduino-1.5.2
#include "Adafruit_GFX.h"// Hardware-specific library
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
//#include <Adafruit_TFTLCD.h>
//Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);
// 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
#ifndef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif
void setup(void);
void loop(void);
unsigned long testText();
uint16_t g_identifier;
void setup(void) {
Serial.begin(9600);
Serial.println(F("TFT LCD test"));
tft.reset();
uint16_t identifier = tft.readID();
if (identifier == 0x9325) {
Serial.println(F("Found ILI9325 LCD driver"));
} else if (identifier == 0x9328) {
Serial.println(F("Found ILI9328 LCD driver"));
} else if (identifier == 0x4535) {
Serial.println(F("Found LGDP4535 LCD driver"));
} else if (identifier == 0x7575) {
Serial.println(F("Found HX8347G LCD driver"));
} else if (identifier == 0x9341) {
Serial.println(F("Found ILI9341 LCD driver"));
} else if (identifier == 0x7783) {
Serial.println(F("Found ST7781 LCD driver"));
} else if (identifier == 0x8230) {
Serial.println(F("Found UC8230 LCD driver"));
}
else if (identifier == 0x8357) {
Serial.println(F("Found HX8357D LCD driver"));
} else if (identifier == 0x0101)
{
identifier = 0x9341;
Serial.println(F("Found 0x9341 LCD driver"));
} else if (identifier == 0x9481)
{
Serial.println(F("Found 0x9481 LCD driver"));
}
else if (identifier == 0x9486)
{
Serial.println(F("Found 0x9486 LCD driver"));
}
else {
Serial.print(F("Unknown LCD driver chip: "));
Serial.println(identifier, HEX);
Serial.println(F("If using the Adafruit 2.8\" TFT Arduino shield, the line:"));
Serial.println(F(" #define USE_ADAFRUIT_SHIELD_PINOUT"));
Serial.println(F("should appear in the library header (Adafruit_TFT.h)."));
Serial.println(F("If using the breakout board, it should NOT be #defined!"));
Serial.println(F("Also if using the breakout, double-check that all wiring"));
Serial.println(F("matches the tutorial."));
identifier = 0x9486;
}
tft.begin(identifier);
Serial.print("TFT size is "); Serial.print(tft.width()); Serial.print("x"); Serial.println(tft.height());
}
#if defined(MCUFRIEND_KBV_H_)
uint16_t scrollbuf[320]; // my biggest screen is 320x480
#define READGRAM(x, y, buf, w, h) tft.readGRAM(x, y, buf, w, h)
#else
uint16_t scrollbuf[320]; // Adafruit only does 240x320
// Adafruit can read a block by one pixel at a time
int16_t READGRAM(int16_t x, int16_t y, uint16_t *block, int16_t w, int16_t h)
{
uint16_t *p;
for (int row = 0; row < h; row++) {
p = block + row * w;
for (int col = 0; col < w; col++) {
*p++ = tft.readPixel(x + col, y + row);
}
}
}
#endif
void windowScroll(int16_t x, int16_t y, int16_t wid, int16_t ht, int16_t dx, int16_t dy, uint16_t *buf)
{
if (dx) for (int16_t row = 0; row < ht; row++) {
READGRAM(x, y + row, buf, wid, 1);
tft.setAddrWindow(x, y + row, x + wid - 1, y + row);
tft.pushColors(buf + dx, wid - dx, 1);
tft.pushColors(buf + 0, dx, 0);
}
if (dy) for (int16_t col = 0; col < wid; col++) {
READGRAM(x + col, y, buf, 1, ht);
tft.setAddrWindow(x + col, y, x + col, y + ht - 1);
tft.pushColors(buf + dy, ht - dy, 1);
tft.pushColors(buf + 0, dy, 0);
}
}
void loop() {
uint8_t aspect;
uint16_t pixel;
char *aspectname[] = {
"PORTRAIT", "LANDSCAPE", "PORTRAIT_REV", "LANDSCAPE_REV"
};
char *colorname[] = { "BLUE", "GREEN", "RED", "GRAY" };
uint16_t colormask[] = { 0x001F, 0x07E0, 0xF800, 0xFFFF };
uint16_t dx, rgb, n, wid, ht;
tft.setRotation(3);
wid = tft.width();
ht = tft.height();
// tft.print("Width=");
// tft.println(wid);
// tft.print("Hight=");
// tft.println(ht);
// === Temp color scale ===
tft.fillScreen(BLACK);
int bleu = 255;
int rouge = 0;
int vert = 0;
int i = 0;
for (int i_v = 0; i_v < 40; i_v++)
{
tft.fillRect ( i * 3, 0, 3, ht, tft.color565(rouge, vert, bleu));
vert = vert + 8;
if (vert > 255)
{
vert = 255;
}
i++;
}
for (int i_b = 0; i_b < 40; i_b++)
{
tft.fillRect ( i * 3, 0, 3, ht, tft.color565(rouge, vert, bleu));
bleu = bleu - 8;
if (bleu < 0)
{
bleu = 0;
}
i++;
}
for (int i_r = 0; i_r < 40; i_r++)
{
tft.fillRect ( i * 3, 0, 3, ht, tft.color565(rouge, vert, bleu));
rouge = rouge + 8;
if (rouge > 255)
{
rouge = 255;
}
i++;
}
for (int i_v = 0; i_v < 40; i_v++)
{
tft.fillRect ( i * 3, 0, 3, ht, tft.color565(rouge, vert, bleu));
vert = vert - 8;
if (vert < 0)
{
vert = 0;
}
i++;
}
delay(2000);
tft.fillScreen(BLACK);
tft.setCursor(0, 72);
tft.setTextSize(4);
tft.setTextColor(WHITE);
tft.write('é');
delay(6000);
if (tft.height() > 64) {
aspect = 3;
tft.setRotation(aspect);
wid = tft.width();
ht = tft.height();
testText();
dx = wid / 32;
for (n = 0; n < 32; n++) {
rgb = n * 8;
rgb = tft.color565(rgb, rgb, rgb);
tft.fillRect(n * dx, 48, dx, 64, rgb & colormask[aspect]);
}
}
tft.println("INVERT DISPLAY");
tft.invertDisplay(true);
delay(5000);
tft.invertDisplay(false);
}
unsigned long testText() {
unsigned long start;
tft.fillScreen(BLACK);
start = micros();
tft.setCursor(0, 0);
tft.setTextColor(WHITE); tft.setTextSize(1);
tft.println("Hello World!");
tft.setTextColor(YELLOW); tft.setTextSize(2);
tft.println(123.45);
tft.setTextColor(RED); tft.setTextSize(3);
tft.println(0xDEADBEEF, HEX);
tft.println();
tft.setTextColor(GREEN);
tft.setTextSize(5);
tft.println("Groop");
tft.setTextSize(2);
tft.println("I implore thee,");
tft.setTextSize(1);
tft.println("my foonting turlingdromes.");
tft.println("And hooptiously drangle me");
tft.println("with crinkly bindlewurdles,");
tft.println("Or I will rend thee");
tft.println("in the gobberwarts");
tft.println("with my blurglecruncheon,");
tft.println("see if I don't!");
return micros() - start;
}
The code works fine.
My question is about using 2 TFT screens... is this possible ? If yes, how ?
If not, hmmm... I'll be force to return one of the screens...
Too bad...
Thanks for your help
Miles
