Topic: Alarm sensor
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Aug 23, 2013, 04:38 am
So I got this alarm sensor over my door. Been there since I moved in. The system never worked. This thing had a magnet attached to the door. Any ideas for arduino? Can I use arduino with this? It has terminal blocks.
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Re: Alarm sensor
Aug 23, 2013, 11:31 am
It is a wireless transmitter.
I see two reed switches, a RF transmitter module, antenna, space for battery, a button and a chip.
The terminal block is for an extra alarm I think.
What does the receiver (the base station of the alarm) look like ?
Most of those use 433MHz with ASK modulation (on/off) and a protocol that can be read and transmitted with the RCSwitch library. On Ebay there are many ASK modules.
The RF transmittor module in the picture is a RFM N5970.
That is 345.0 MHz. A weird frequency, I think it is not legal to use it.
Conclusion: Old, unknown and perhaps not legal to use. Sorry, but you better toss it away.