Dear all
I am having arduino UNO and i have connected hardaware where i could able use DS1307 and 24LC08 eeprom device.i would like to know
For seven bit addressing what should be slave address for 24LC08 module.
i am bit confuse when i read datashet there are 2 addressing modes
7 bit or 10 bit addressing mode. How should we put value of slave address in this case.
I know arduino support library function . for sake of knowledge how it can be calculated.
i have got below code from herehttp://www.bristolwatch.com/arduino/arduino_ds1307.htm
if i wanted to write differnt timing into eeprom location how should i write or append the page .
/*
http://www.bristolwatch.com/arduino/arduino_ds1307.htm
Arduino with a DS1307 Real Time Clock
Lewis Loflin lewis@bvu.net
This code comes with no warranty.
*/
#include <Wire.h> // specify use of Wire.h library.
#define ONE_HZ_SW 2 // one Hz square wave from Ds1307
#define blinkPin 13
#define SW0 4
#define SW1 5
#define SW2 6
void setup()
{
Wire.begin(); // join i2c bus (address optional for master)
Serial.begin(9600);
digitalWrite(blinkPin, 0);
pinMode(ONE_HZ_SW, INPUT);
pinMode(SW0, INPUT); // for this use a slide switch
pinMode(SW1, INPUT); // N.O. push button switch
pinMode(SW2, INPUT); // N.O. push button switch
digitalWrite(ONE_HZ_SW, HIGH);
digitalWrite(SW0, HIGH); // pull-ups on
digitalWrite(SW1, HIGH);
digitalWrite(SW2, HIGH);
}
void loop()
{
// wait or HIGH
while (!digitalRead(ONE_HZ_SW)) {
}
Wire.beginTransmission(0x68);
Wire.write(0); // location pointer
Wire.endTransmission();
Wire.requestFrom(0x68, 7); // send 7 bytes
byte secs = Wire.read();
byte mins = Wire.read();
byte hrs = Wire.read();
byte day = Wire.read();
byte date = Wire.read();
byte month = Wire.read();
byte year = Wire.read();
// hours, minutes, seconds
Serial.print("The time is ");
if (hrs < 10) Serial.print("0");
Serial.print(hrs, HEX);
Serial.print(":");
if (mins < 10) Serial.print("0");
Serial.print(mins, HEX);
Serial.print(":");
if (secs < 10) Serial.print("0");
Serial.println(secs, HEX);
// use MM-DD-YYYY
Serial.print("The date is ");
if (month < 10) Serial.print("0");
Serial.print(month, HEX);
Serial.print("-");
if (date < 10) Serial.print("0");
Serial.print(date, HEX);
Serial.print("-");
Serial.print("20");
if (year < 10) Serial.print("0");
Serial.println(year, HEX);
Serial.println();
if (!(digitalRead(SW0))) set_time(); // hold the switch to set time
while (digitalRead(ONE_HZ_SW)) {
} // wait or LOW
toggle(blinkPin);
}
// toggle the state on a pin
void toggle(int pinNum)
{
int pinState = digitalRead(pinNum);
pinState = !pinState;
digitalWrite(pinNum, pinState);
}
void set_time() {
byte minutes = 0;
byte hours = 0;
while (!digitalRead(SW0))
// set time switch must be released to exit
{
while (!digitalRead(SW1)) // set minutes
{
minutes++;
if ((minutes & 0x0f) > 9) minutes = minutes + 6;
if (minutes > 0x59) minutes = 0;
Serial.print("Minutes = ");
if (minutes >= 9) Serial.print("0");
Serial.println(minutes, HEX);
delay(750);
}
while (!digitalRead(SW2)) // set hours
{
hours++;
if ((hours & 0x0f) > 9) hours = hours + 6;
if (hours > 0x23) hours = 0;
Serial.print("Hours = ");
if (hours <= 9) Serial.print("0");
Serial.println(hours, HEX);
delay(750);
}
Wire.beginTransmission(0x68); // activate DS1307
Wire.write(0); // where to begin
Wire.write(0x00); //seconds
Wire.write(minutes); //minutes
Wire.write(0x80 | hours); //hours (24hr time)
Wire.write(0x06); // Day 01-07
Wire.write(0x16); // Date 0-31
Wire.write(0x11); // month 0-12
Wire.write(0x13); // Year 00-99
Wire.write(0x10); // Control 0x10 produces a 1 HZ square wave on pin 7.
Wire.endTransmission();
}
}
