Hello All,
Seems i suck at searching the forums for info i need so apologies if this info is somewhere else.
Basically i am wanting to make a scheduled relay activator. I have looked around for schedulers but supprisingly have not found much. Anyway my few questions are below.
I have added some code to sync my arduino time with the connected RTC module. I obviously need to do this to restore the arduino time if power is cut. My first question is how often should i sync the RTC time to the Arduino board when running continuasly? Further to that later i am going to have to make something to sync the RTC time from my PC how often should i be doing this? - This part is running off a DS1307 and the TimeAlarms.h library alternative suggestions are welcome.
Below is what i have put together so far. Not really required to answer my question. Basically it is a mix of hte TimeAlarmExample and some Ds1307 code to sync the onboard arduino clock with the RTC and fire some preset/hardcoded example alarms. UNTESTED at this time.
/*
* TimeAlarmExample.pde
*
* This example calls alarm functions at 8:30 am and at 5:45 pm (17:45)
* and simulates turning lights on at night and off in the morning
* A weekly timer is set for Saturdays at 8:30:30
*
* A timer is called every 15 seconds
* Another timer is called once only after 10 seconds
*
* At startup the time is set to Jan 1 2011 8:29 am
*/
#include <Time.h>
#include <TimeAlarms.h>
#include <Wire.h>
#define DS1307_I2C_ADDRESS 0x68
int ledPin = 13;
// for RTC work
byte RTCsecond, RTCminute, RTChour, RTCdayOfWeek, RTCdayOfMonth, RTCmonth, RTCyear;
void setup()
{
pinMode(ledPin, OUTPUT); // show the status
Serial.begin(9600); // for debugging
Serial.flush(); // need to flush serial buffer, otherwise first read from reset/power on may not be correct
Wire.begin(); // initialise i2c bus for DS1307
clkSync();
// create the alarms
Alarm.alarmRepeat(8,30,0, MorningAlarm); // 8:30am every day
Alarm.alarmRepeat(17,45,0,EveningAlarm); // 5:45pm every day
Alarm.alarmRepeat(dowSaturday,8,30,30,WeeklyAlarm); // 8:30:30 every Saturday
Alarm.timerRepeat(15, Repeats); // timer for every 15 seconds
Alarm.timerOnce(10, OnceOnly); // called once after 10 seconds
}
void loop(){
digitalClockDisplay();
Alarm.delay(1000); // wait one second between clock display
}
// functions to be called when an alarm triggers:
void MorningAlarm(){
Serial.println("Alarm: - turn lights off");
}
void EveningAlarm(){
Serial.println("Alarm: - turn lights on");
}
void WeeklyAlarm(){
Serial.println("Alarm: - its Monday Morning");
}
void ExplicitAlarm(){
Serial.println("Alarm: - this triggers only at the given date and time");
}
void Repeats(){
Serial.println("15 second timer");
}
void OnceOnly(){
Serial.println("This timer only triggers once");
}
void digitalClockDisplay()
{
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.println();
}
void printDigits(int digits)
{
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}
void setDateDs1307(byte RTCsecond, // 0-59
byte RTCminute, // 0-59
byte RTChour, // 1-23
byte RTCdayOfWeek, // 1-7
byte RTCdayOfMonth, // 1-28/29/30/31
byte RTCmonth, // 1-12
byte RTCyear) // 0-99
{
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.send(0);
Wire.send(decToBcd(RTCsecond)); // 0 to bit 7 starts the clock
Wire.send(decToBcd(RTCminute));
Wire.send(decToBcd(RTChour)); // If you want 12 hour am/pm you need to set
// bit 6 (also need to change readDateDs1307)
Wire.send(decToBcd(RTCdayOfWeek));
Wire.send(decToBcd(RTCdayOfMonth));
Wire.send(decToBcd(RTCmonth));
Wire.send(decToBcd(RTCyear));
Wire.endTransmission();
}
// Gets the date and time from the ds1307
void getDateDs1307(byte *RTCsecond,
byte *RTCminute,
byte *RTChour,
byte *RTCdayOfWeek,
byte *RTCdayOfMonth,
byte *RTCmonth,
byte *RTCyear)
{
// Reset the register pointer
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.send(0);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
// A few of these need masks because certain bits are control bits
*RTCsecond = bcdToDec(Wire.receive() & 0x7f);
*RTCminute = bcdToDec(Wire.receive());
*RTChour = bcdToDec(Wire.receive() & 0x3f); // Need to change this if 12 hour am/pm
*RTCdayOfWeek = bcdToDec(Wire.receive());
*RTCdayOfMonth = bcdToDec(Wire.receive());
*RTCmonth = bcdToDec(Wire.receive());
*RTCyear = bcdToDec(Wire.receive());
}
// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
return ( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
return ( (val/16*10) + (val%16) );
}
void clkSync()
{
getDateDs1307(&RTCsecond, &RTCminute, &RTChour, &RTCdayOfWeek, &RTCdayOfMonth, &RTCmonth, &RTCyear);
setTime(RTChour,RTCminute,RTCsecond,RTCmonth,RTCdayOfMonth,RTCyear); // set time to Saturday 8:29:00am Jan 1 2011
}