Arduino 1.77" display

Connections and Libraries

Arduino	Display	Name	Purpose	No needed?	Constructor 2!
3.3V	8 LEDA	Lite	Backlight control
10	7 CS	Chip Select / DC (Data/Command)	SS PIN / SPI data or command selector [SS = Slave Select]	Yes	Yes
9	6 RS	Register Selection	MISO - Sending to Master	Yes	Yes
8	5 RES	Reset / RST	Reset the TFT	Yes	Yes
11	4 SDA	Serial Data	MOSI - Sending to Slave		Yes
13	3 SCK	SCLK - Clock Line	SPI Clock Input		Yes
5V	2 VCC	Voltage Common Collector
GND	1 GND	Ground	Ground

Install and Download library:

• https://adafru.it/dXk
• https://adafru.it/cBB

Sketch -> Include Library -> Add .ZIP Library

Theory: SPI protocol

Serial Peripheral Interface

The SPI enabled device typically has the following pins:

• SS: A line indicating slave device selection
• MISO and MOSI (Master In Slave Out): A line for sending serial data to the Master device
• SCK/SCLK (Serial Clock): A clock signal generated by the Master device to synchronize data transmission, so the slave device knows when to read the input.
• RESET: A line for restarting the transmission process.

Code 1

Source code from https://www.arthurwiz.com/software-development/177-inch-tft-lcd-display-with-st7735s-on-arduino-mega-2560

#include <Adafruit_GFX.h>    
#include <Adafruit_ST7735.h> 
#include <SPI.h>

#define TFT_CS    10
#define TFT_RST   8  
#define TFT_DC    9 

#define TFT_SCLK 13   
#define TFT_MOSI 11   

//Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS,  TFT_DC, TFT_RST);
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);

void setup(void) {
  tft.initR(INITR_BLACKTAB);  
  tft.fillScreen(ST7735_BLACK); 
 
  tft.setTextColor(ST7735_WHITE);
  tft.setTextSize(0);
  tft.setCursor(30,80);
  tft.println("Hello World!");  
  delay(1000);
  
}

void loop() {
  tft.fillScreen(ST7735_WHITE); 
  delay(1000);
  tft.setTextColor(ST7735_BLACK);
  tft.setTextSize(0);
  tft.setCursor(30,80);
  tft.println("Toimii!!");  

  delay(500);
}

References

https://www.arthurwiz.com/software-development/177-inch-tft-lcd-display-with-st7735s-on-arduino-mega-2560