one hour alarm window using RTC

Projects Programming
1

Hi Guys,

so I got my clock working really nice with a RTC and everything. I'm also able to turn an alarm on and off. So far so good...

What I want to do is turn an alarm on at 4PM and turn it off at 5PM

setSyncProvider(RTC.get);
Alarm.delay(0);
Alarm.alarmRepeat(16,0,0, ledAlarmOn);
Alarm.delay(0);
Alarm.alarmRepeat(17,0,0, ledAlarmOff);

.
.
.

void ledAlarmOn(){

digitalWrite(Pin1, HIGH);
}

void ledAlarmOff(){

digitalWrite(Pin1, LOW);

BUT: What if I turn on my device at 4:30PM, I still want the alarm come on and stay on till 5PM.

That's my problem and I need help! Is there any if> function I could use or a totally different approach?

Thank you so much!!!

Flo

2

Start here

Most notably, section 6.

3

I'm sorry...here is the code I used:

 setSyncProvider(RTC.get);  
 Alarm.delay(0);                                
 Alarm.alarmRepeat(16,0,0, ledAlarmOn);              
 Alarm.delay(0);                                   
 Alarm.alarmRepeat(17,0,0, ledAlarmOff);

  .
  . 
  .

void ledAlarmOn(){ 
    
     digitalWrite(Pin1, HIGH);                 
}

void ledAlarmOff(){ 
    
     digitalWrite(Pin1, LOW);
4

daflogotit:
I'm sorry...here is the code I used:

Random periods are likely to cause a compiler error. Same with the lack of setup and loop functions.

5

here is the code I used:

No setup() function, no loop() function, and those dots won't compile. That is NOT the code you used.

6

I didn't mean to mess up my very first post, I guess I just wanted to "shorten" my code to demonstrate what I'm talking about...

#include <Wire.h>
#include <DS1307RTC.h>
#include <Time.h>
#include <TimeAlarms.h>

int Pin1 = 7; 

void setup()

{
  Wire.begin(); 
  Serial.begin(9600);
  pinMode(Pin1, OUTPUT); 


}

void loop()
{

setSyncProvider(RTC.get);  
 Alarm.delay(0);                                
 Alarm.alarmRepeat(16,0,0, ledAlarmOn);              
 Alarm.delay(0);                                   
 Alarm.alarmRepeat(17,0,0, ledAlarmOff);
}

  
void ledAlarmOn(){ 
    
     digitalWrite(Pin1, HIGH);                 
}

void ledAlarmOff(){ 
    
     digitalWrite(Pin1, LOW);   
}

I hope this is better :slight_smile:

7

So you need to get the current time at start-up and check if it's within your alarm range. If so, run the ledAlarmOn() function.

8 
setSyncProvider(RTC.get);  
 Alarm.delay(0);                                
 Alarm.alarmRepeat(16,0,0, ledAlarmOn);              
 Alarm.delay(0);                                   
 Alarm.alarmRepeat(17,0,0, ledAlarmOff);

None of this belongs in loop().

9

Hi Arrch, that's a great idea. I'm just not sure about a good way to do that...
I tried a couple things like

if functions in the 
 Alarm.delay(0);                                
 Alarm.alarmRepeat(16,0,0, ledAlarmOn);

any ideas? Thanks

10

No idea what you are trying to do here:

if functions in the 
 Alarm.delay(0);                                
 Alarm.alarmRepeat(16,0,0, ledAlarmOn);

but I would recommend looking into the RTC library for some kind of function that that returns the current time. Even better if you can return just the hour and compare it to 16. If it's equal, then run ledAlarmOn.

11

Great thanks, I'm going to try to find some