Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Remotely turning on a LED - 200 feet away

Status
Not open for further replies.

StephanieD

Newbie level 1
Joined
May 9, 2011
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,293
(newbie alert)

My boyfriend works in a noisey environment in his garage. The garage is detached from the house. When a phone call comes for him, he can't hear a phone or feel a cell phone on vibrate.

I would like to buy (or build :-O ) a LED that he could strap to his arm like a wrist watch. When I'm in the house and hear the phone ringing, I can press a button and the LED on his wrist lights up.

Yes I COULD walk out to the garage and get him every time, that's what I've been doing. But by the 15th call of the day I'm thinking that I REALLY need to find a technical solution to this problem! So yeah this post is about me being lazy!

The LED / receiver would have to be battery powered in order to be mobile. The base unit with the button could be powered by AC or DC, it doesn't matter either way to me.

I thought about getting some electronics wiz to modify a remote control car but I don't think I would get the range necessary.

Any suggestions as to where to look for such a device or kit?
 

jiripolivka

Advanced Member level 5
Joined
May 21, 2010
Messages
2,832
Helped
831
Reputation
1,660
Reaction score
802
Trophy points
1,393
Location
Santa Barbara
Activity points
22,012
There are "wireless" remote-control switches to switch lamps,etc. by pushing a button on a keychain transmitter. Their range is ~ 30 meters but can be extended by adding a wire antenna. On websites like "allelectronics.com" such pairs are also available. Some experiments will be needed to optimize the operation.
Your friend can also use his cell phone kept in shirt pocket. Vibrator can be felt even in heavy noise environment.
 

BradtheRad

Super Moderator
Staff member
Joined
Apr 1, 2011
Messages
13,969
Helped
2,784
Reputation
5,566
Reaction score
2,691
Trophy points
1,393
Location
Minneapolis, Minnesota, USA
Activity points
104,201
You'll have to find a way to install led at the proper spot in the circuits.

1.

Lost keyring locator gadget. Press a button on the remote. Your keyring plays a beep.

2.

Wireless doorbell. Battery operated pushbutton sends signal to chime receiver. I've seen chime receivers that plug into house current. There may be a model that runs on battery.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top