U731219879 rc: Created page with "Reference page 9 for the PCF85263AT-RTC data registers in the data sheet: https://www.nxp.com/docs/en/data-sheet/PCF85263A.pdf
Connect '''Pin 5 (SDA) & Pin 4 (SCL)''' on..."

2019-03-23T04:15:28Z

Created page with "Reference page 9 for the PCF85263AT-RTC data registers in the data sheet: https://www.nxp.com/docs/en/data-sheet/PCF85263A.pdf Connect '''Pin 5 (SDA) & Pin 4 (SCL)''' on..."

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Reference page 9 for the PCF85263AT-RTC data registers in the data sheet: https://www.nxp.com/docs/en/data-sheet/PCF85263A.pdf 
Connect '''Pin 5 (SDA) & Pin 4 (SCL)''' on the PCF8526AT board to '''Pin A5 (SDA) & Pin A4 (SCL)''' on the Arduino Uno 
Copy and Paste the PCF85263AT RTC program into the Arduino IDE. 
Update the values in the void setup() second, minute, hour, dayOfWeek, dayOfMonth, month, year to the current values. 
Test to make sure everything was entered correctly by clicking on the Check-mark. Correct any errors. 
Upload the program to the Arduino Uno. 
'''PCF85263AT-RTC.INO'''
// PCF85263AT RTC write/read demonstration
#include "Wire.h" //Enable I2C library
#define PCF85263address 0x51 //define I2C address
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
String days[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
byte bcdToDec(byte value)
{
return ((value / 16) * 10 + value % 16);
}
byte decToBcd(byte value)
{
return (value / 10 * 16 + value % 10);
}
void setPCF85263() // this function sets the time and date to the PCF85263

{
Wire.beginTransmission(PCF85263address);
Wire.write(0x01);
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.endTransmission();
}
void readPCF85263() // this gets the time and date from the PCF85263
{
Wire.beginTransmission(PCF85263address);
Wire.write(0x01);
Wire.endTransmission();
Wire.requestFrom(PCF85263address, 7);
second = bcdToDec(Wire.read() & B01111111); // remove VL error bit
minute = bcdToDec(Wire.read() & B01111111); // remove unwanted bits from MSB
hour = bcdToDec(Wire.read() & B00111111);
dayOfMonth = bcdToDec(Wire.read() & B00111111);
dayOfWeek = bcdToDec(Wire.read() & B00000111);
month = bcdToDec(Wire.read() & B00011111); // remove century bit, 1999 is over
year = bcdToDec(Wire.read());
}
void setup()
{
Wire.begin();
Serial.begin(9600);
// change the following to set your initial time
second = 0;
minute = 9;
hour = 21;
dayOfWeek = 0;
dayOfMonth = 6;
month = 1;
year = 19;
// comment out the next line and upload again to set and keep the time from resetting every reset
setPCF85263();
}
void loop()
{
readPCF85263();
Serial.print(days[dayOfWeek]);
Serial.print(" ");
Serial.print(month, DEC);
Serial.print("/");
Serial.print(dayOfMonth, DEC);
Serial.print("/20");
Serial.print(year, DEC);
Serial.print(" - ");
Serial.print(hour, DEC);
Serial.print(":");
if (minute < 10)
{
Serial.print("0");
}
Serial.print(minute, DEC);
Serial.print(":");
if (second < 10)
{
Serial.print("0");
}
Serial.println(second, DEC);
delay(1000);
}

Open Console port and watch output.

Programming PCF85263AT with Arduino IDE - Revision history

U731219879 rc: Created page with "Reference page 9 for the PCF85263AT-RTC data registers in the data sheet: https://www.nxp.com/docs/en/data-sheet/PCF85263A.pdf Connect '''Pin 5 (SDA) & Pin 4 (SCL)''' on..."

U731219879 rc: Created page with "Reference page 9 for the PCF85263AT-RTC data registers in the data sheet: https://www.nxp.com/docs/en/data-sheet/PCF85263A.pdf
Connect '''Pin 5 (SDA) & Pin 4 (SCL)''' on..."