#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <RTClib.h>
#include <EEPROM.h>
RTC_DS1307 rtc;
#define LED 8
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET 4
#define SCREEN_ADDRESS 0x3c
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
unsigned long old_time;
void setup() {
Serial.begin(9600);
pinMode(LED, OUTPUT);
if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for (;;)
; // Don't proceed, loop forever
}
if (!rtc.begin()) {
Serial.println("Couldn't find RTC");
Serial.flush();
while (1) delay(10);
}
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// display.clearDisplay();
// showStr("NKHS", 41, 0, 1);
// showStr("C241", 41, 16, 1);
// display.display();
// delay(2000);
// old_time = millis();
}
void loop() {
String years, months, days, hours, minutes, seconds, date, time;
DateTime now = rtc.now();
CPU();
years = fixtime(String(now.year()));
months = fixtime(String(now.month()));
days = fixtime(String(now.day()));
hours = fixtime(String(now.hour()));
minutes = fixtime(String(now.minute()));
seconds = fixtime(String(now.second()));
date = years + "/" + months + "/" + days;
time = hours + ":" + minutes + ":" + seconds;
display.clearDisplay();
showStr(date, 5, 0, 1);
showStr(time, 16, 32, 1);
display.display();
}
void CPU() {
if (millis() - old_time > 100) {
old_time = millis();
digitalWrite(LED, 1 - digitalRead(LED));
}
}
void showStr(String s, int x, int y, int color) {
display.setTextSize(2);
if (color == 1) {
display.setTextColor(SSD1306_WHITE);
} else {
display.setTextColor(SSD1306_BLACK);
}
display.setCursor(x, y);
display.println(s);
}
String fixtime(String s) {
if (s.length() == 1) {
return '0' + s;
}
else {
return s;
}
}