Need a simple telemeter circuit

[Ejaz]

I need to use it to transmit data (0 OR 1) to 5-6 meters away. Could anyone please help! Thanks in advance!

 

[ve7brz]

Please tell us why 5 or 6 meters of wire won't work.

 

[Ejaz]

It's a sensing system for patients that would lit an LED when there is 1. At present it's built as a compact system as an experiment. I would like to separate the indicator part from the main circuit so that the indicator can be placed somewhere else, for example nurse stations. I've asked for 5-6 meters just to test the system. I won't mind if it covers more distance.

 

[ve7brz]

Have a look at this thread:

thread236-37114

 

[melone]

If you go wireless, you better make sure that you don't interfere with any other machines! It sounds like this is a medical device, and I think that they are extremely sensitive about RF emissions.

 

[Ejaz]

Yes, that's my main concern.

 

[eduardom]

Apart from RF and infrared, you may use a high frequency audio tone, for example 30 kHz.
This tone will neither interfere nor be heard.

 

[Ejaz]

Could anyone please help me with a circuit!

 

[eduardom]

Try this site.

http://www.commlinx.com.au/schematics.htm