multiple RF transmitters and one receiver

Hello

We're having a trouble with our senior project, I hope you can help me with the idea.

Our project is implementing some kind of GPS using RF transmitter and receiver. We have three transmitter each one indicates one area, so we have 3 different areas. each area is assigned a code that the RF transmitter transmit. If the user with the receiver walks in say area 1,an attached LCD will show him that he is in area 1 depending on the received code.

The objective is that the receiver should know which area it is in AND where the other two areas located ( give directions). We are using these kind of RF transmitters and receivers:
http://kitsguru.com/index.php?route=product/product&product_id=762

The problem is that the receiver can't receive multiple signals, so we have to think for other way to receive multiple signals and measure each signal strength to give directions.

any idea of how to do that?

Thanks.

The problem is that the receiver can't receive multiple signals,

Sure it can, just not if the transmitters are going at the same time. The secret is to synchronise the transmitters so that only one sends at any one time.

The only snag is that your idea of using signal strength will not work.

Grumpy_Mike:
Sure it can, just not if the transmitters are going at the same time. The secret is to synchronise the transmitters so that only one sends at any one time.

The only snag is that your idea of using signal strength will not work.

Thank you for your fast response.

if each transmitter sends at a specific interval, how the receiver will know which area it is in without an indication of the strength of the signal?

We are thinking of using RF transceivers that are capable of measuring the signal strength but the problem that the transmitters shouldn’t work at the same time, is there some way to synchronize these transmitters so that they transmit one at a time using Arduino? ( we have each transmitter connected to Arduino)

Signal strength is not reliable, useful information. Think of a different project or approach.

INTP:
Signal strength is not reliable, useful information. Think of a different project or approach.

then how to tell where are the other areas and give directions without measuring the signal strength?

eehatim:
then how to tell where are the other areas and give directions without measuring the signal strength?

Use GPSs.

Hi,
If you have to use the 3TX, then you need to limit their range, like a cell phone system.

Check the types of aerials you can use that have specific radiation patterns.
You need to restrict the reception of each Tx to is OWN AREA for your system to work.

This is an RF Transmission Pattern problem, not a software problem.

Those Tx/Rx you have are not going to give you signal strength output.

Tom... :slight_smile:

TomGeorge:
Hi,
If you have to use the 3TX, then you need to limit their range, like a cell phone system.

Check the types of aerials you can use that have specific radiation patterns.
You need to restrict the reception of each Tx to is OWN AREA for your system to work.

This is an RF Transmission Pattern problem, not a software problem.

Those Tx/Rx you have are not going to give you signal strength output.

Tom... :slight_smile:

let's say that each transmitter have limited range on its own area, how the receiver gives directions where are the other two areas if it only receives one signal on the area range? (an objective of the project to indicate current area + identify or locate other areas using only RF transmission)

This is a very difficult problem, a lot more difficult that you can possible know.
The only example I know of doing this on a hobby budget is to use this
https://www.pozyx.io even so it is not cheap.