Initial code using a 120x120 TFT display and a realtime clock module.
/*****************************************************************************
The ST7789 IPS SPI display.is a 3.3v Device, do not use with a 5v Arduino
unless you level shift.
Display | Arduino
-------------------------------------------
VCC | 3.3v
GND | Gnd
SCL | Pin 13 (SCK)
SDA | Pin 11 (MOSI)
RES | Pin 9
DC | Pin 8
BLK | Leave disconnected
*****************************************************************************/
#include <Adafruit_GFX.h>
#include <Arduino_ST7789.h>
#include <SPI.h>
#include "RTClib.h"
#define TFT_DC 8
#define TFT_RST 9
#define TFT_MOSI 11
#define TFT_SCLK 13
#define DAYLIGHT_SAVING_PIN 5
// Clock Variables
int _Day, _OldDay = 0;
int _Hours, _OldHours = 0;
int _Minutes, _OldMinutes = 0;
int _DaylightSaving = 0;
int _xH, _yH, _OldxH, _OldyH = 0;
int _xM, _yM, _OldxM, _OldyM = 0;
Arduino_ST7789 tft = Arduino_ST7789(TFT_DC, TFT_RST, TFT_MOSI, TFT_SCLK); //No CS pin
RTC_DS3231 rtc;
void setup(void)
{
pinMode(DAYLIGHT_SAVING_PIN, INPUT); // Setup daylight saving sw port
digitalWrite(DAYLIGHT_SAVING_PIN, HIGH);
// initialize the realtime clock
rtc.begin();
// initialize the display
tft.init(240, 240);
tft.setRotation(3);
tft.fillScreen(BLACK);
tft.setTextSize(2);
DrawClockFace();
DrawClockNumbers();
}
void loop()
{
DateTime now = rtc.now();
_Day = now.day();
_Hours = now.hour();
_Minutes = now.minute();
if (digitalRead(DAYLIGHT_SAVING_PIN) == 0)
delay(50);
if (digitalRead(DAYLIGHT_SAVING_PIN) == 0)
_DaylightSaving = !_DaylightSaving;
if (_DaylightSaving == 1)
_Hours++;
if ((_Hours != _OldHours) || (_Minutes != _OldMinutes))
{
UpdateHands();
DrawClockNumbers();
_OldHours = _Hours;
_OldMinutes = _Minutes;
}
if (_Day != _OldDay)
{
UpdateDate();
_OldDay = _Day;
}
delay(1000);
}
void UpdateHands()
{
//x = x0 + r * Math.Cos(theta * Math.PI / 180);
//y = y0 + r * Math.Sin(theta * Math.PI / 180);
//Hours hands (erase old hours hand then redraw new one)
tft.drawLine((tft.width() / 2), (tft.height() / 2), _OldxH, _OldyH, BLACK);
_xH = (tft.width() / 2) + 70 * cos((((30 * _Hours) + (0.5 * _Minutes)) - 90) * PI / 180);
_yH = (tft.height() / 2) + 70 * sin((((30 * _Hours) + (0.5 * _Minutes)) - 90) * PI / 180);
tft.drawLine((tft.width() / 2), (tft.height() / 2), _xH, _yH, WHITE);
_OldyH = _yH;
_OldxH = _xH;
//Minutes hands (erase old minutes hand then redraw new one)
tft.drawLine((tft.width() / 2), (tft.height() / 2), _OldxM, _OldyM, BLACK);
_xM = (tft.width() / 2) + 95 * cos(((6 * _Minutes) - 90) * PI / 180);
_yM = (tft.height() / 2) + 95 * sin(((6 * _Minutes) - 90) * PI / 180);
tft.drawLine((tft.width() / 2), (tft.height() / 2), _xM, _yM, WHITE);
_OldxM = _xM;
_OldyM = _yM;
tft.fillCircle((tft.width() / 2), (tft.height() / 2), 3, WHITE);
}
void UpdateDate()
{
tft.setTextColor(BLACK);
tft.setCursor(210, 220);
tft.print(_OldDay);
tft.setTextColor(GREEN);
tft.setCursor(210, 220);
tft.print(_Day);
tft.setTextColor(WHITE);
}
void DrawClockFace()
{
int _x1, _y1 = 0;
//x = x0 + r * Math.Cos(theta * Math.PI / 180);
//y = y0 + r * Math.Sin(theta * Math.PI / 180);
tft.drawCircle((tft.width() / 2), (tft.height() / 2), 119, WHITE);
tft.drawCircle((tft.width() / 2), (tft.height() / 2), 118, WHITE);
// Minute marks
for (int x = 0; x <= 60; x++)
{
_x1 = (tft.width() / 2) + 118 * cos(((6 * x) - 90) * PI / 180);
_y1 = (tft.height() / 2) + 118 * sin(((6 * x) - 90) * PI / 180);
tft.drawLine((tft.width() / 2), (tft.height() / 2), _y1, _x1, WHITE);
}
tft.fillCircle((tft.width() / 2), (tft.height() / 2), 110, BLACK);
// 5 minute marks
for (int x = 0; x <= 12; x++)
{
_x1 = (tft.width() / 2) + 118 * cos(((30 * x) - 90) * PI / 180);
_y1 = (tft.height() / 2) + 118 * sin(((30 * x) - 90) * PI / 180);
tft.drawLine((tft.width() / 2), (tft.height() / 2), _y1, _x1, WHITE);
}
tft.fillCircle((tft.width() / 2), (tft.height() / 2), 105, BLACK);
}
void DrawClockNumbers()
{
tft.setTextColor(WHITE);
tft.setCursor(163, 32);
tft.print("1");
tft.setCursor(196, 65);
tft.print("2");
tft.setCursor(210, 113);
tft.print("3");
tft.setCursor(199, 160);
tft.print("4");
tft.setCursor(164, 193);
tft.print("5");
tft.setCursor(115, 207);
tft.print("6");
tft.setCursor(70, 195);
tft.print("7");
tft.setCursor(35, 160);
tft.print("8");
tft.setCursor(20, 113);
tft.print("9");
tft.setCursor(33, 66);
tft.print("10");
tft.setCursor(66, 34);
tft.print("11");
tft.setCursor(109, 20);
tft.print("12");
}
