This project uses an Arduino UNO or Arduino Mega with a SIM900 shield/module and a Relay shield/module to attain the following objectives: -Be able to call a phone number that automatically switches a relay. -The received call is never picked up. As soon as the call is received, is dropped so no phone charges are made by firing the relay. -Only authorized phone numbers will work, other callers will be ignored. -Phonebook for at least 64 entries. -Phonebook management done via SMS messages
I wanted to do this project because I hate RF receivers and their poor performance. This is a more useful (and cheaper at the long run) solution. Plus, it has been a blast making it work.
You only need the appropiate hardware (Arduino + SIM900 + Relay) and the Arduino IDE you can download from http://www.arduino.cc/ This project so far only uses libraries that come standard with the IDE installation
License is still undecided, but the TL;DR version is do whatever you want with this, but if you fix things or add features, please contribute, and is you're using it, leave me a note with your impressions.