SPI Displays am Arduino

1,77 Zoll 160x128 RGB Display (blau)

Anschluss

Diese Displays dürfen nur an 3,3V angeschlossen werden. Da der Arduino Uno auf seinen GPIO-Pins 5 V ausgibt, müssen die Pins über einen Logic-Level-Converter (LLC) auf 3,3V reduziert werden.

Code

#include <Adafruit_GFX.h>
// Core graphics library
#include <Fonts/FreeSansBold9pt7b.h>
#include <Adafruit_ST7735.h> // Hardware-specific library
#include <SPI.h>

Adafruit_ST7735 tft = Adafruit_ST7735(10, 8, 9);

void setup(void) {
    tft.initR(INITR_GREENTAB);
    tft.fillScreen(ST77XX_BLACK);
    delay(500);
    testbild();
    delay(1000);
    tft.setTextColor(ST77XX_WHITE, ST77XX_BLACK);
    tft.setTextSize(2);
    tft.setFont(); // reset font to default
}

void loop() {
    for(uint8_t i = 0; i < 100; i++) {
        changing_value(i);
        delay(100);
    }
}

void testbild() {
    tft.setFont(&FreeSansBold9pt7b);
    tft.fillScreen(ST77XX_BLACK);
    tft.setTextColor(ST77XX_RED);
    tft.setCursor(14, 22);
    tft.print("Testbild");
    tft.drawFastHLine(0, 35, 128, ST77XX_GREEN);
    tft.drawTriangle(1, 45, 28, 70, 55, 45, ST77XX_WHITE);
    tft.fillTriangle(78, 70, 104, 45, 127, 70, 0xA3F6);
    tft.drawRect(1, 80, 50, 30, ST77XX_BLUE);
    tft.fillRoundRect(78, 80, 50, 30, 5, 0x2D4E);
    tft.fillCircle(25, 135, 15, 0x5BA9);
    tft.drawCircle(102, 135, 15, ST77XX_GREEN);
    tft.drawLine(45, 150, 80, 40, ST77XX_ORANGE);
}

void changing_value(uint8_t value) {
    if(value < 10) {
        tft.setCursor(15, 88);
        tft.print("0");
        tft.print(value);
    } else {
        tft.setCursor(15, 88);
        tft.print(value);
    }
}

1,8 Zoll 128x160 RGB Display (rot)

Anschluss

Code

#include <Adafruit_GFX.h> // Core graphics library
#include <Adafruit_ST7735.h> // Hardware-specific library for ST7735
#include <SPI.h>
#define TFT_CS 10
#define TFT_RST 8
#define TFT_DC 9
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

void setup(void){
    Serial.begin(9600);
    tft.initR(INITR_BLACKTAB); // Init ST7735S chip, black tab
    tft.fillScreen(ST77XX_BLACK);
    drawtext("Hallo!", ST77XX_RED);
    Serial.println("Setup abgeschlossen!");
}

void loop() {
    tft.invertDisplay(true);
    delay(500);
    tft.invertDisplay(false);
    delay(500);
}

void drawtext(char *text, uint16_t color) {
    tft.setCursor(0, 50);
    tft.setTextColor(color);
    tft.setTextSize(2);
    tft.setTextWrap(true);
    tft.print(text);
}

void fillScreenBlink(uint16_t color1, uint16_t color2) {
    tft.fillScreen(color1);
    delay(1000);
    tft.fillScreen(color2);
}