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a simple alarm

nouman

Aug 18, 2010
4
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Aug 18, 2010
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i want to make a simple so that if go about 10 feet away from my cell phone
the alarm rings and remind me about mobile??????
 

nouman

Aug 18, 2010
4
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Aug 18, 2010
Messages
4
i need a simple alarm so that if i go about 10m far from my cell the alarm rings and remind me about my cell..
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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25,510
It's called a proximity alarm. The problem is what do you do if you forget to take the proximity alarm with you?
 

shaheen

Nov 1, 2009
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Infrared_Proximity_Detector_Alarm_Circuit_Diagram.GIF


For further information visit this link.
http://www.extremecircuits.net/2010/07/infrared-proximity-detector-alarm.html
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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That's a little different. It detects proximity by a reflected signal. Probably not going to work unless nouman keeps it pointed to his phone at all times. If he remembers that, he won't forget his phone :)
 

nouman

Aug 18, 2010
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That's a little different. It detects proximity by a reflected signal. Probably not going to work unless nouman keeps it pointed to his phone at all times. If he remembers that, he won't forget his phone :)
that alarm can attached with a watch or car keys
thats y i am in search of non directional sensors that transmitts signals in 10ft radius
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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apart from the fact that it's directional, if it was connected to your phone and pointed to a wall, it would be the wall that would have to move to get the alarm to go off.
 

nouman

Aug 18, 2010
4
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Aug 18, 2010
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That's a little different. It detects proximity by a reflected signal. Probably not going to work unless nouman keeps it pointed to his phone at all times. If he remembers that, he won't forget his phone :)
any better idea?
 
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