Arduino programming HELP NEEDED!!!

Can you please post your currant code and circuit diagram. Also, if it is literally just switching something on at a certain time, you may be better off with one of these:

http://www.amazon.co.uk/Electronic-digital-mains-Socket-Display/dp/B002P7RF9A/ref=sr_1_1?ie=UTF8&qid=1408837264&sr=8-1&keywords=plug+timer

I use and old mechanical version to automatically switch off my soldering iron every 20 minutes so I cant leave it on overnight.

I don't really have any code yet. Everything I have started on is a bust. I am building a school bell timer to ring before and in-between classes. I have an arduino uno, a sainsmart 2-channel relay module, and a tinyrtc ic2. Currently the bell is operated by a button wich closes the connection between two wires. All I need to do is tell the arduino to switch the relay and close the connection for 'x' amount of time (about 2 seconds) at certain times throughout the day.

Yes I can do that Thank you again!

Your welcome. Please make sure you test it. It is simple code but I don't want to make any large mistakes. Also, could you please mark my answer as correct so people know that you don't need any more help. Where is this going to be installed? It would be nice to know who I have helped plus it could could be good for a resume in the future.

I thought I got the time set, but it isn't wanting to work. It isnt setting the time from my computer.

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib

#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 RTC;

void setup () {
    Serial.begin(57600);
    Wire.begin();
    RTC.begin();

rtc.adjust(DateTime(2014,MONTH,DAY,HOUR,MINUTE,0));
  }

}

void loop () {

}

Right, try this. Line 13, replace the month day hour and minute with the correct numerical values.

Im getting these errors when I try to upload

Untitled_Project.ino:13:1: error: use of undeclared identifier 'rtc'

rtc.adjust(DateTime(2014,8,23,21,18,0));

^
Untitled_Project.ino:16:1: error: extraneous closing brace ('}')

}

^

Change rtc to RTC (block capitals)
and delete the curly brace directly underneath it. It is quite late where I am at the moment so I am making a few silly mistakes.

I got the time set, but when I upload the bellring sketch I get this

BellRing.ino:19:7: error: use of undeclared identifier 'now'

  if (now.hour() == 21 && now.minute() == 26){

  ^
BellRing.ino:19:27: error: use of undeclared identifier 'now'

  if (now.hour() == 21 && now.minute() == 26){

  ^
2 errors generated.

Add this line directly above the first bellring module. (line 17): DateTime now = RTC.now();

Okay. That worked. Also I forgot to mention that my relay module works different than most others. It switches OFF when power is supplied to the control pin. To fix that I would just have to switch the 'HIGH' and 'LOW' in your code, correct?

Yep, that is correct. I also recommend that you add the line "digitalWrite(relay,HIGH);"  between line 14 and 15. Without this the bell will ring non stop until the first alarm as the pin defaults as low. An active low relay seems quite dangerous to me. Here, if the control circuitry fails the bell will ring constantly, and in an oven this could start a fire. I recommend you add a suitable switch to override the relay to spare everyone's ears if it does go wrong.

Yep, that is correct. I also recommend that you add the line "digitalWrite(relay,HIGH);"  between line 14 and 15. Without this the bell will ring non stop until the first alarm as the pin defaults as low. An active low relay seems quite dangerous to me. Here, if the control circuitry fails the bell will ring constantly, and in an oven this could start a fire. I recommend you add a suitable switch to override the relay to spare everyone's ears if it does go wrong.

I just tested it out but it was delayed by about a minute and the relay stayed on for almost two minutes

how long did you set the relay to go on for what number did you actually enter. As for the delay, your time may be a minute or so behind from when you where uploading the time. It probably took about a minute for the rtc to be programed with the time from when you entered it in the time setting program. Try setting the time a minute in the future when using the upload program to help compensate.

I set the belltiime as "2" and then changed the "(belltime*1000)" to just "(2000)" but it still does the same thing

my bad. I forgot to add the (delay59000) after the last relay command.

Try running the blink sketch with the relay connected to pin 13. If that works then I don't know what the problem is. If it fails, then I think the problem is your relay. Test and report back.

I got your sketch to work okay. the only problem im having is setting and keeping the time on the RTC module. If i set the time with a sketch that outputs to a serial monitor, the time resets back to what it was originally set to everytime the serial monitor is opened. The only way i can get the time to set is by not outputting to a serial monitor, but then i cant see whats going on and im blinded.

But it is working, right? Do you have a battery installed in the RTC. If not, install one. Other than that I don't know what the problem is.

there is a network plug right beside where this will be located. Would it be better to have it get the time from the internet? but then again if the internet goes down the bell wouldnt work.

Probably not, this would be way to complex. I am still unsure, is it working? If so, why do you need a serial monitor?

yes, your code works. but i just tried to check/change the time on the rtc and it quit working. The only reason i need the serial monitor is to check and see what the time on the rtc is.