The other day my father and I were discussing about the problems of living in a third world country. Because of the social inequality, there is little security on the streets. Also one major problem is that no one is secure, even the 1% richer, because there are know cases of robbers getting inside homes even on private neighbourhoods. We ended up thinking about putting a home security system in our house. The problem is those are very expensive and, in general, they just ring an alarm to scare potential thieves, but they don’t actually warn you in real-time that your house is being invaded. A complete system would be even more expensive. So I got the idea to make my own Arduino based home alarm. I just had to buy a GSM shield for the Arduino Uno, because all other parts I already had.