My idea is to remotely send the temp/ alarm of a cool-room (that we use to store frozen foods) to a mobile phone, the idea is that it will send an update on the temp every 4 hours and or send an alarm message through when it gets to hot.
The problem I'm having is trying to find a way to send this message.
My original thought was to send it through a SMS but I,m told there isn't a GMS shield that can work on an Australian 3G networks
So i moved to having a wireless WiFi modem (as i don't have a landline) and a WiFi shield and send it through an email, but this is proving difficult as well
i was just wondering if anybody had any ideas, or can see anything im doing wrong ?
SMS: Sometimes a connector on a mobile phone can be used to send sms messages. That setup is reliable.
There are a number of shields for GSM/GPRS, are they all unsuitable ?
Bluetooth: only for a short range.
Wifi: that is a good option.
The examples are for Twitter and WebClient. Sending an email is not that easy, but it is possible, Arduino Forum
Creating a Webserver with the temperatures is easier, but you still have to sent an alarm. How far are you away from the cool-room? Perhaps an alarm with a siren and red flashing lights will do ?