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The PCF8563 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. A programmable clock output, interrupt output, and voltage-low detector are also provided. All addresses and data are transferred serially via a two-line bidirectional I²C-bus. Maximum bus speed is 400 kbit/s.
This is an easy to use module for this device
Features
Connection
Arduino Pin | Module Pin |
5v | Vcc |
GND | Gnd |
A5 | SCL |
A4 | SDA |
Code
You do not need a library but I downloaded the library from https://bitbucket.org/orbitalair/arduino_rtc_pcf8563/downloads
This is one of the basic examples
[codesyntax lang=”cpp”]
/* Demonstration of Rtc_Pcf8563 Alarms. * * The Pcf8563 has an interrupt output, Pin3. * Pull Pin3 HIGH with a resistor, I used a 10kohm to 5v. * I used a RBBB with Arduino IDE, the pins are mapped a * bit differently. Change for your hw. * SCK - A5, SDA - A4, INT - D3/INT1 * * After loading and starting the sketch, use the serial monitor * to see the clock output. * * setup: see Pcf8563 data sheet. * 1x 10Kohm pullup on Pin3 INT * No pullups on Pin5 or Pin6 (I2C internals used) * 1x 0.1pf on power * 1x 32khz chrystal * * Joe Robertson, jmr * orbitalair@bellsouth.net */ #include <Wire.h> #include <Rtc_Pcf8563.h> /* get a real time clock object */ Rtc_Pcf8563 rtc; /* a flag for the interrupt */ volatile int alarm_flag=0; /* the interrupt service routine */ void blink() { alarm_flag=1; } void setup() { pinMode(3, INPUT); // set pin to input digitalWrite(3, HIGH); // turn on pullup resistors Serial.begin(9600); /* setup int on pin 3 of arduino */ attachInterrupt(1, blink, FALLING); /* clear out all the registers */ rtc.initClock(); /* set a time to start with. * day, weekday, month, century, year */ rtc.setDate(14, 6, 3, 0, 10); /* hr, min, sec */ rtc.setTime(1, 15, 40); /* set an alarm for 20 secs later... * alarm pin goes low when match occurs * this triggers the interrupt routine * min, hr, day, weekday * 99 = no alarm value to be set */ rtc.setAlarm(16, 99, 99, 99); } void loop() { /* each sec update the display */ Serial.print(rtc.formatTime()); Serial.print(" "); Serial.print(rtc.formatDate()); Serial.print(" 0x"); Serial.print(rtc.getStatus2(), HEX); Serial.print("\r\n"); delay(1000); if (alarm_flag==1){ clr_alarm(); } } void clr_alarm() { detachInterrupt(1); Serial.print("blink!\r\n"); rtc.clearAlarm(); delay(1000); alarm_flag=0; attachInterrupt(1, blink, FALLING); }
[/codesyntax]
Links
PCF8563 RTC Board PCF8563T CMOS Real-time Clock/Calendar Development Module