90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
// Date and time functions using a PCF8563 RTC connected via I2C and Wire lib
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#include "RTClib.h"
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RTC_PCF8563 rtc;
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char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
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// use D2 for INT0; attach to CLKOUT pin on RTC
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const uint8_t INT_PIN = 2;
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// flag to update serial; set in interrupt callback
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volatile uint8_t tick_tock = 1;
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// INT0 interrupt callback; update tick_tock flag
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void set_tick_tock(void) {
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tick_tock = 1;
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}
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void setup () {
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Serial.begin(115200);
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#ifndef ESP8266
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while (!Serial); // wait for serial port to connect. Needed for native USB
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#endif
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pinMode(INT_PIN, INPUT); // set up interrupt pin
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digitalWrite(INT_PIN, HIGH); // turn on pullup resistors
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// attach interrupt to set_tick_tock callback on rising edge of INT0
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attachInterrupt(digitalPinToInterrupt(INT_PIN), set_tick_tock, RISING);
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if (! rtc.begin()) {
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Serial.println("Couldn't find RTC");
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Serial.flush();
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while (1) delay(10);
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}
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if (rtc.lostPower()) {
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Serial.println("RTC is NOT initialized, let's set the time!");
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// When time needs to be set on a new device, or after a power loss, the
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// following line sets the RTC to the date & time this sketch was compiled
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rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
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// This line sets the RTC with an explicit date & time, for example to set
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// January 21, 2014 at 3am you would call:
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// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
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//
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// Note: allow 2 seconds after inserting battery or applying external power
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// without battery before calling adjust(). This gives the PCF8523's
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// crystal oscillator time to stabilize. If you call adjust() very quickly
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// after the RTC is powered, lostPower() may still return true.
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}
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// When time needs to be re-set on a previously configured device, the
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// following line sets the RTC to the date & time this sketch was compiled
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// rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
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// This line sets the RTC with an explicit date & time, for example to set
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// January 21, 2014 at 3am you would call:
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// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
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// When the RTC was stopped and stays connected to the battery, it has
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// to be restarted by clearing the STOP bit. Let's do this to ensure
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// the RTC is running.
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rtc.start();
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// turn on 1Hz clock out, used as INT0 for serial update every second
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rtc.writeSqwPinMode(PCF8563_SquareWave1Hz);
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}
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void loop () {
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// check if time display should be output
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if(tick_tock) {
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DateTime now = rtc.now();
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char time_format[] = "hh:mm:ss AP";
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char date_format[] = "MM/DD/YYYY";
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Serial.println(now.toString(time_format));
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Serial.println(now.toString(date_format));
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Serial.println();
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tick_tock = 0;
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}
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}
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