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.

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.

If someone could help me write up this code, that would be really great.

This library should let me interface with the rtc. Please install it while I write some quick code.

https://github.com/adafruit/RTClib

I have it installed.

Great. this code will let you set the time. Just upload it with the rtc attached. It uses your computer clock so make sure that is set right.

// 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();

  if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }

}

void loop () {
    DateTime now = RTC.now();

    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(' ');
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();

    Serial.print(" since 1970 = ");
    Serial.print(now.unixtime());
    Serial.print("s = ");
    Serial.print(now.unixtime() / 86400L);
    Serial.println("d");

    // calculate a date which is 7 days and 30 seconds into the future
    DateTime future (now.unixtime() + 7 * 86400L + 30);

    Serial.print(" now + 7d + 30s: ");
    Serial.print(future.year(), DEC);
    Serial.print('/');
    Serial.print(future.month(), DEC);
    Serial.print('/');
    Serial.print(future.day(), DEC);
    Serial.print(' ');
    Serial.print(future.hour(), DEC);
    Serial.print(':');
    Serial.print(future.minute(), DEC);
    Serial.print(':');
    Serial.print(future.second(), DEC);
    Serial.println();

    Serial.println();
    delay(3000);
}

And this will be your actual code. Well almost. Read the comments (grey stuff) they explain how to correctly set it up. I needed about a minute after I saw your post to finish it but I uploaded the other code first so you didn't need to wait.

//Bellclock v1.0 Created by kidiccurus I alow you to use this program on the condition that no more than 1 (one) Great British Pound (GB£) of revenue will be generated as a result of its use or sale. Just put that in there to stop you selling this to anyone
//Conect your relay to digital pin 4
//requires the libary you just installed
 
#include <Wire.h>
#include "RTClib.h"
//Please est the lenght of time (in seconds) you would like the bell to ring for here in place of the number 2. Please do not set a decimal.
int belltime = 2;
int relay = 4;
RTC_DS1307 RTC;
void setup() {
  Wire.begin();
   RTC.begin();
   pinMode(relay,OUTPUT);
}
void loop() {
  
 //This module rings the bell. In the top row, the number 12 can be changed for the hour in 24 hour format and the number 0 can be changed for the minute (0-59).
 //Please copy and paste this module as many times as required 
  if (now.hour() == 12 && now.minute() == 0){
    digitalWrite(relay,HIGH);
    delay(belltime*1000);
    digitalWrite(relay,LOW);
     };
 //This is the end of the module if you are going to copy and paste
  
 //Place here
//Or here
//Or here 
  
//Or here  
  
//Or here

//Et cetera et cetera
  
}

Just spotted a minor glitch. After the line "digitalWrite(relay,LOW); " In theBell ringing module,please add the line "delay(59000);" Whithout this the code will ring the bell for a full minute.

On this first bit of code (for setting the clock), I have verified that my computer time is correct, but when I upload to the arduino, the time is not the same and is incorrect.

Nevermind! I got the time set correctly.

Great. Now make sure you update the code according to instructions. It would be embarrassing for my code to annoy the large amount of people who will be within range of the bell when it goes off. Any other requests for the code please don't hesitate to post here.

Thank you for the code! I have one more request. I don't want to mess up the formatting in the code, so could you post it again with 10 bell timing modules? (10 different times to ring the bell)