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. ready ?? grab the tools !
What you’ll need
An old mobile phone set with supply (charger). Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ). 5 volts Relay. Soldering iron. wires and thin insulated copper wires. micro driller. micro screwdriver set. clipper. multimeter. Scotch tape.