RF Transmit to key fob

[mzaetz]

Hello all,
I'm working on a little project and I've hit kind of a roadblock and looking for some help. I'm trying to use a microcontroller (Raspberry Pi) to monitor a sensor and then when a certain event happens, the controller will transmit a signal to a receiver that will simply be an alarm...buzzer or LEDs or both...ideally a small key fob device. I see key fob transmitters available, but no receiver. Does something like that exist? I see basic RF transmitter/receiver devices to talk between two arduinos, but no simple, dumb receivers.
Or would "listening" be too much of a power draw anyway and I should find a different approach?

Any direction would be appreciated.

[adafruit_support_mike]

The receivers for our keyfobs are here:

https://www.adafruit.com/products/1096
https://www.adafruit.com/products/1097
https://www.adafruit.com/products/1098

[mzaetz]

I'm sorry...what I meant was, I'm looking for a key fob type device that IS a receiver. I will transmit from a raspberry pi to the key fob. The key fob would only have the receiver,an LED or a Buzzer, and a small battery for power on it.

[adafruit_support_mike]

Oh, I see what you mean.

I'm afraid we don't have any keyfob-shaped receivers in the shop.

You might take a look at the XBee: https://www.adafruit.com/search?q=xbee The Series 1 version gives you a simple point-to-point wireless data link with a few GPIO pins.