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Can anyone tell me what this device uses? Answered

Hi everyone,

Im really stuck at the moment. I've been racking my brains trying to figure out what sensor is used in this device and would love if someone could help me!

The device is this:  http://www.ebay.ie/itm/NOVELTY-ELECTRONIC-PERSONAL-PROXIMITY-REMINDER-ALARM-/150412364558?pt=UK_Safety_Alarms&hash=item2305468b0e#ht_964wt_952

I've bought one but cannot for the life of me figure out what exact sensor it uses.

Thanks in advanced,
Andrew.

Comments

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steveastrouk
steveastrouk

9 years ago

I agree its radio based. The only legal band that makes sense would be 433Mhz.

Steve

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Axial-Andrew
Axial-Andrew

9 years ago

Thanks everyone for the advice!...my project involves using 4 of these type of sensors in the same product, this is where i hit another snag...there is no numbers of frequencies or anything on the actual components so i was wondering is this possible?

Im looking for the simplest solution as im not very good at all with electronics :/...but i figure if they can make that product fairly small...its acheivable.

thank you again,
A

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Goodhart
Goodhart

9 years ago

It appears to be used to keep things within a certain distance i.e. a child....if it wonders off too far, the alarm goes off. I have one something like this one, somewhere, I was playing with awhile back, but but I didn't really care for how well it performed. Yours may be better made then mine was. This then means it is definitely using a low, very low powered radio signal (one that wouldn't interfere with an actual radio unless held right next to it)....very much like the car key alarm / door lock key fob.

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lemonie
lemonie

9 years ago

PERSONAL-PROXIMITY says "ultra-sound" to me.
I think I can see a transmitter and receiver (round black things).

L

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Axial-Andrew
Axial-Andrew

9 years ago

Hey, thanks for your swift reply, i do have a picture of the components, any further information would be great, you guys are life savers.

Heres the picture...
And the receiver too...

Thanks again!

DSCF1088.JPGDSCF1099.JPG
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mpilchfamily
mpilchfamily

Reply 9 years ago

Like i said look for any IC on the boards and look up the numbers etched onto the ICs. Then you will have a better idea of what your dealing with.

Are you trying to use this in a project?

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mpilchfamily
mpilchfamily

9 years ago

Considering the price i'd say its a basic RC transmitter and receiver. One keeps sending out a radio signal. As long as the receiver unit keeps getting that signal everything is fine. One the transmitter goes out of range the alarm sounds. If you want to know the frequency it uses then open it up and hope it has an actual chip with markings on it rather then a SMD with black protective coating over it.

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Jayefuu
Jayefuu

Reply 9 years ago

+1. You could also open it up and take some pictures for us.