本來這系列都計畫用SeeedStduio Grove系列產品做的，但是 Grove 系列沒推出較高解析度的LCM，在希望友直接顯示的實驗下只好選用其他廠家的LCM模組。
Adafruit 2.4" TFT 附帶沒編碼過的電阻式觸控，面板解析度為 240 X 320 對角 2.4英吋，主控IC 是ILI 9341 可用SPI或8Bit傳送資料，資料線和電源是3.3V或5V都可(一般外面買的ILI3941 LCM不只電源要求3.3V就連信號也要3.3V。
Adafruit 最大的特點就是包裝就是隨便綑一綑。
內容物就是一片LCM一個排針。
LCM 排針一邊是給8Bit資料傳輸用一邊是給SPI資料傳輸用，為了減少接腳就選用SPI焊接。
要用SPI傳輸LCM背後IM1.IM2.IM3 要用焊錫短路。
再來就接線
LCM RST >> D5
LCM DC >> D6
LCM CS >> D7
LCM MOSI >> D8
LCM MISO >> D9
LCM CLK >> D10
LCM Y+ >> A3
LCM X- >> A2
LCM Y- >> D3
LCM X- >> D4
到這下載需要的 Library解壓縮後放在Arduino目錄下的\libraries\。
https://github.com/adafruit/Touch-Screen-Library
https://github.com/adafruit/Adafruit_ILI9341
https://github.com/adafruit/Adafruit-GFX-Library
開啟Arduino 輸入以下程式碼。
//This example implements a simple slidi。ng On/Off button. The example
// demonstrates drawing and touch operations.
//
//Thanks to Adafruit forums member Asteroid for the original sketch!
//
#include <Adafruit_GFX.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_ILI9341.h>
#include <TouchScreen.h>
//觸控 X+ X- Y+ Y- pins
#define YP A3 // 只可以使用類比輸入 An !
#define XM A2 // 只可以使用類比輸入 An !
#define YM 3 //數位 I/O
#define XP 4 //數位 I/O
//觸控面板校正原始資料
#define TS_MINX 150
#define TS_MINY 120
#define TS_MAXX 920
#define TS_MAXY 940
#define MINPRESSURE 10
#define MAXPRESSURE 1000
// 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);
#define TFT_RST 5
#define TFT_DC 6
#define TFT_CS 7
#define TFT_MOSI 8
#define TFT_MISO 9
#define TFT_CLK 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);
boolean RecordOn = false;
#define FRAME_X 70
#define FRAME_Y 80
#define FRAME_W 200
#define FRAME_H 100
#define REDBUTTON_X FRAME_X
#define REDBUTTON_Y FRAME_Y
#define REDBUTTON_W (FRAME_W/2)
#define REDBUTTON_H FRAME_H
#define GREENBUTTON_X (REDBUTTON_X + REDBUTTON_W)
#define GREENBUTTON_Y FRAME_Y
#define GREENBUTTON_W (FRAME_W/2)
#define GREENBUTTON_H FRAME_H
void drawFrame()
{
tft.drawRect(FRAME_X, FRAME_Y, FRAME_W, FRAME_H, ILI9341_BLACK);
}
void redBtn()
{
tft.fillRect(REDBUTTON_X, REDBUTTON_Y, REDBUTTON_W, REDBUTTON_H, ILI9341_RED);
tft.fillRect(GREENBUTTON_X, GREENBUTTON_Y, GREENBUTTON_W, GREENBUTTON_H, ILI9341_BLUE);
drawFrame();
tft.setCursor(GREENBUTTON_X + 6 , GREENBUTTON_Y + (GREENBUTTON_H/2));
tft.setTextColor(ILI9341_WHITE);
tft.setTextSize(5);
tft.println("ON");
RecordOn = false;
}
void greenBtn()
{
tft.fillRect(GREENBUTTON_X, GREENBUTTON_Y, GREENBUTTON_W, GREENBUTTON_H, ILI9341_GREEN);
tft.fillRect(REDBUTTON_X, REDBUTTON_Y, REDBUTTON_W, REDBUTTON_H, ILI9341_BLUE);
drawFrame();
tft.setCursor(REDBUTTON_X + 6 , REDBUTTON_Y + (REDBUTTON_H/2));
tft.setTextColor(ILI9341_WHITE);
tft.setTextSize(5);
tft.println("OFF");
RecordOn = true;
}
void setup(void)
{
pinMode(13, OUTPUT);
tft.begin();
tft.fillScreen(ILI9341_BLACK);
// origin = left,top landscape (USB left upper)
tft.setRotation(1);
redBtn();
}
void loop()
{
// Retrieve a point
TSPoint p = ts.getPoint();
// See if there's any touch data for us
if (p.z > MINPRESSURE && p.z < MAXPRESSURE)
{
// Scale using the calibration #'s
// and rotate coordinate system
p.x = map(p.x, TS_MINY, TS_MAXY, 0, tft.height());
p.y = map(p.y, TS_MINX, TS_MAXX, 0, tft.width());
int y = tft.height() - p.x;
int x = p.y;
if (RecordOn)
{
if((x > REDBUTTON_X) && (x < (REDBUTTON_X + REDBUTTON_W))) {
if ((y > REDBUTTON_Y) && (y <= (REDBUTTON_Y + REDBUTTON_H))) {
digitalWrite(13, LOW);
redBtn();
}
}
}
else //Record is off (RecordOn == false)
{
if((x > GREENBUTTON_X) && (x < (GREENBUTTON_X + GREENBUTTON_W))) {
if ((y > GREENBUTTON_Y) && (y <= (GREENBUTTON_Y + GREENBUTTON_H))) {
digitalWrite(13, HIGH);
greenBtn();
}
}
}
}
}
按上傳LCM就會顯示ON綠燈時LinkIt Smart 7688 Duo 版上的D13LED就會亮，按一下LCM的OFF。
當紅燈亮起時LinkIt Smart 7688 Duo 版上的D13LED就會熄滅。再按一下LCM的 ON LCM就會顯示綠燈 LinkIt Smart 7688 Duo 版上的D13LED就會亮。
參考資料:https://www.adafruit.com/
