Looking for specialized wireless components

[hippypink]

I am looking for something that can communicate with another device, so that when the transmitter/receiver are far enough apart, I can trigger a sound or some other event.

* Low power (ideally run on a watch battery for at least 1 year).

* Range minimum of 20 ft. 50ft+ ideal
* Very small, and flat. smaller = better
* Low cost. i know there are often tradeoffs in size/price, but wondering what my options are.
* if there are other ones around, they can operate on several separate channels (no interference)
* Approved usage by FCC, of course

 

[VEBill]

It's not going to be exactly what you're looking for, but there are (or have been) inexpensive systems on the market that alert the parent when a toddler wanders off. When the dropping signal strength reaches a threshold, an alert sounds.

This is just intended to be a data point about a related product.

 

[MacGyverS2000]

If it's continuously checking distance, you're not going to get that distance using a watch battery as a power source. A single ping several times a day, okay, but not continuous...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[hippypink]

Not sure if my last post didnt make it, or if it got deleted.

I found some things out there. One is pretty close, but quite large. I also found "nRF2402 is the Industry's smallest, lowest cost, lowest current consumption and low voltage supply 2.4GHz RF transmitter. "

If someone wanted to help me design something I could pay them.

 

[MikeHalloran]

ISTR that the FCC has some nonobvious rules about that 2.4GHz band, e.g. that continuous or regularly timed transmission is not permitted.

Detection of loss of signal with increasing range may not be reliable because the comm link is digital, and is probably not permissible because it implies continuous transmission.

IF you had some _other_ ranging means, that transmitter would be a good way to transmit a signal stating that the threshold range had been exceeded, but it would not be permissible to transmit the measured range at regular intervals.

So, you've solved maybe 1/4 of your problem.

I suggest you investigate ranging by ultrasonics, and if you have line of sight, by triangulation of IR beams, and whatever else you can think of.






Mike Halloran
Pembroke Pines, FL, USA

 

[nestafred]

I am using a transmitter which sends a frequency of 433.52MHz wireless. I need to build a receiver which is able to process such frequency. Any information that you can give me will be highly appreciated.
Thanks
Nestafred.

 

[MacGyverS2000]

fred, have you done any research yourself?

Dan - Owner

http://www.Hi-TecDesigns.com