HELP: How to link multiply transmitter to one receiver

Hi

IMHO you will have to time multiplex them (i,e only onw switched on at a time) , they will not work together at the same time.

If the transmitter sends only when the button is pressed and two buttons are not pressed at the same time, it should work without any gimmicks.

If there is a chance that two buttons are pressed at the same time the transmitter would have to be timed individually to not send at the same "time-slot".

Elias

Hello,

This is a normal part of designing radio systems.  Most if not all radio systems have to deal with multiply transmitters. If you are having problems sending a signal from one transmitter to the receiver while the other six units are turned on it is likely that the transmitters are transmitting beckon packets without your knowledge.

You will need to look at the firmware of the transmitter and receiver and develop a method of synchronizing the transmitters so they do not step on each other. Instead of developing the firmware yourself you might be able to get some help from the manufacturer of the radio modules.  They might have provided a patch or a method of synchronizing the transmitters within the development firmware.   I would give them a call first.

If you need help with firmware design I would suggest you consider a simple multiplexing algorithm that incorporates Aloha protocol.  This will solve the next problem you will face, which is an increase in packet errors due to heavy traffic on the channel.

Hope this helps,

Chris

http://www.pinterec.ca/services/wireless-development

Are you using the Encoder/Decoder ICs in between already or have you tried directly from transmitter to receiver?

If you have the encoders and decoders in between have you successfully "learned" all the unique serials of the encoders?

Elias

It does then sound like they are transmitting at least something like beacons, like Chris mentioned.

Without having more details about the RF module I can't tell too much about it.

Maybe you need to hook the enable pin of the transmitter to the buttons also to have the module disabled if no button is pressed.

Elias

Thank Elias and Chirs. I think i got the answer. I will try it (= Thank alot guys, you all are really did a great help to me.

No problem, glad to be able to help

Elias