put a motion sensor in this for the space?

Post : Doorbell to Internet bridge also useful for other home automation
URL : http://hackaday.com/2012/09/28/doorbell-to-internet-bridge-also-useful-for-other-home-automation/
Posted : September 28, 2012 at 5:01 am
Author : Mike Szczys
Tags : attiny84, doorbell, home automation, rfm12b
Categories : home hacks, wireless hacks

http://hackadaycom.files.wordpress.com/2012/09/doorbell-internet-bridge.jpg

This wireless doorbell hack can send a text message when someone rings (http://harizanov.com/2012/08/hooking-my-wireless-doorbell-to-the-internet/) . Adding the hardware to the chime unit turned out to be quite simple. It shows potential for a slew of other applications.

[Martin] started the project with a breakout board he had designed for an RFM12B wireless transceiver board. This board is popular (http://hackaday.com/2011/11/13/colornode-a-drop-in-ge-color-effects-led-controller/) because of its low-cost, small size, and ease of operation. [Martin's] breakout is barely larger than the RFM module itself, and merely adds an ATtiny84 to the mix. In the case of this doorbell project he uses a pin interrupt to detect when the doorbell's LED is illuminated. This wakes the chip from sleep and sends a message back to the receiver that something has happened.

The receiver can do anything it wants with that data. In this case it uses an email-to-SMS service to send [Martin] a text message. But the home automation applications are vast for this simple hardware. We have a water heater that is not near a floor drain so we use a simple leak detector to sound an alarm if there is ever a problem (the water heater sits in a shallow tray). That works if we're home at the time. Using [Martin's] solution could extend that alarm's reach worldwide.

[via Hacked Gadgets (http://hackedgadgets.com/2012/09/03/wireless-doorbell-sends-sms-message-when-activated/) ]

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