Never mind - in the wiring diagram there is no mention of Analog 4 and 5 as the ports to use… Once I figured that out it worked fine.
I just hooked up a RTC DS1307 to my Arduino and when I try to set the time using the demo code, no matter what time I set it replies:
45:165:85 165.165.165
I found a Polish post regarding the same problem (?) but as I don’t speak Polish, it was not of much use.
Any thoughts?
Thanks - very clearly written.
I am sorry for I cannot find where to start a new question.
I have installed an DS1307 at my arduino uno and used a code for setting the GMT. After this the correct time was on the screen except for the year; that shows 200 due to the fact that while setting the data the year was already written as 0.
is this a program problem or a problem with the DS1307?
below is the sketch,
greetings
Hendrik
#include <Wire.h>
const int DS1307 = 0x68;
const char* days =
{“Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”};
const char* months =
{“January”, “February”, “March”, “April”, “May”, “June”, “July”, “August”,
“September”, “October”, “November”, “December”};
byte second = 0;
byte minute = 0;
byte hour = 0;
byte weekday = 0;
byte monthday = 0;
byte month = 0;
byte year = 00;
void setup() {
Wire.begin();
Serial.begin(9600);
delay(2000);
Serial.print("The current date and time is: ");
printTime();
Serial.println(“To set the date and time please select Newline ending to continue.”);
Serial.println(“Would you like to set the date and time now? Y/N”);
while (!Serial.available()) delay(5000);
if (Serial.read() == ‘y’ || Serial.read() == ‘Y’) {
Serial.read();
setTime();
Serial.print("The current date and time is now: ");
printTime();
}
Serial.println(“Goodbye.”);
}
void loop() {}
byte decToBcd(byte val) {
return ((val/10*16) + (val%10));
}
byte bcdToDec(byte val) {
return ((val/16*10) + (val%16));
}
void setTime() {
Serial.print("Please enter the current year, 00-99. - ");
year = readByte();
Serial.println(year);
Serial.print("Please enter the current month, 1-12. - ");
month = readByte();
Serial.println(months[month-1]);
Serial.print("Please enter the current day of the month, 1-31. - ");
monthday = readByte();
Serial.println(monthday);
Serial.println(“Please enter the current day of the week, 1-7.”);
Serial.print("1 Sun | 2 Mon | 3 Tues | 4 Weds | 5 Thu | 6 Fri | 7 Sat - ");
weekday = readByte();
Serial.println(days[weekday-1]);
Serial.print("Please enter the current hour in 24hr format, 0-23. - ");
hour = readByte();
Serial.println(hour);
Serial.print("Please enter the current minute, 0-59. - ");
minute = readByte();
Serial.println(minute);
second = 0;
Serial.println(“Thank you.”);
Wire.beginTransmission(DS1307);
Wire.write(byte(0));
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(weekday));
Wire.write(decToBcd(monthday));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.write(byte(0));
Wire.endTransmission();
}
byte readByte() {
while (!Serial.available()) delay(10);
byte reading = 0;
byte incomingByte = Serial.read();
while (incomingByte != ‘\n’) {
if (incomingByte >= ‘0’ && incomingByte <= ‘9’)
reading = reading * 10 + (incomingByte - ‘0’);
else;
incomingByte = Serial.read();
}
Serial.flush();
return reading;
}
void printTime() {
char buffer[3];
const char* AMPM = 0;
readTime();
Serial.print(days[weekday-1]);
Serial.print(" ");
Serial.print(months[month-1]);
Serial.print(" ");
Serial.print(monthday);
Serial.print(“, 20”);
Serial.print(year);
Serial.print(" ");
if (hour > 12) {
hour -= 12;
AMPM = " PM";
} else AMPM = " AM";
Serial.print(hour);
Serial.print(“:”);
sprintf(buffer, “%02d”, minute);
Serial.print(buffer);
Serial.println(AMPM);
}
void readTime() {
Wire.beginTransmission(DS1307);
Wire.write(byte(0));
Wire.endTransmission();
Wire.requestFrom(DS1307, 7);
second = bcdToDec(Wire.read());
minute = bcdToDec(Wire.read());
hour = bcdToDec(Wire.read());
weekday = bcdToDec(Wire.read());
monthday = bcdToDec(Wire.read());
month = bcdToDec(Wire.read());
year = bcdToDec(Wire.read());
}