Tilt Sensor Alarm

Some time back I came across an article in a magazine where a boy lost his leg thanks to his habit of balancing on chairs. I thought why not build a tilt sensor alarm for chairs before calamity struck me too. So I came up with this simple tilt sensor circuit which doesn't really need any instructions to build.


Materials Required:

• A Piezo Buzzer
• A 9v Battery
• A 9v Battery Connector
• A dead AAA battery
• A small and thin magnet
• A small box to keep the circuit compact
• Aluminium foil or any small conductive sheet

Tools Required:

• Insulation tape 
• Double sided tape
• Soldering iron and solder instead of insulation tape

Step by step instructions:

The Tilt Sensor Circuit

A Close-up of the connectors.

• Scrap off the paint of a dead battery
• Cut two pieces of aluminium foil of about 1cm X 1cm
• Connect the positive end of the battery connector to the positive end of the piezo buzzer by twisting the copper strands together or by soldering
• Fix the magnet on one side of the box as indicated in the images above so that the battery remains stuck to the contact points for a while
• Stick the negative ends of the buzzer and battery on either side of the magnet keeping in mind their alignment with the rolling battery
• Stick the aluminium foils on top of the negative ends to improve connectivity on the contact points
• Arrange the circuit in your box as indicated in the images above and do the necessary for aesthetic beauty :)

Hard Luck for those who love to balance on chairs!

Now you can place this circuit wherever you like and use it as a tilt sensor. Of course the smaller the piezo buzzer, the battery and the rolling element, the more compact the circuit box. Simple as that!