Instructables
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how to make a sample magnetic sensor on the cheap
materials :

1 match box

2 paper clib

2 wires

1 piece of foil

tabe

a small circuit for test 

 
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Step 2: Add the aluminum foil to the case

and now we will add the aluminum foil to the case

Step 3: Make the other paper clip and connect the wire

connect the wire to the other paper clip

Step 4: Finish the sensor

secure every thing in place and it is ready to test 
nice one
flxforce3 years ago
I have tried,but after it contacted the speaker have no invoice...thanks also..
Mahmoud Alaa (author)  flxforce2 years ago
you are welcome ... but what speaker
siamonsez3 years ago
I could see a very cool application of this design if there was a way to modify it so that one 'touch' from the magnet turned it on and another turned it off. Then you could stick a neodine (sp?) magnet on the tip of one of the dozzens of magic wand ibles around here and use it to make some real magic happen by wiring this switch into all kinds of stuff around the house and using the wand like a remote. Is there a way to interface this switch with high voltage applications like light switches?
Mahmoud Alaa (author)  siamonsez3 years ago
this is a very good idea and i will tr to make it and upload it
thanks
sunshiine3 years ago
Nice! Thanks for sharing your work!
Mahmoud Alaa (author)  sunshiine3 years ago
thanks for give me patch
You are welcome! Good man! Have a splendorous day!
Mahmoud Alaa (author)  sunshiine3 years ago
hahaha thx