Got sick of the high prices of Home Security systems ??
have old mobile sets don't know what to do with ?
build a cheap alarm system that will notify you on your mobile by SMS.
grab the tools !
Step 1: What you'll need
Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ).
5 volts Relay.
wires and thin insulated copper wires.
micro screwdriver set.