2 set of Boe Bot running with 2 identical pairs of Tx and Rx

quekyt

Hi, I am trying to setup a racing game using 2 Boe Bot. They are controlled via wireless communication using the parallax Transmitters and Receivers. as in one Boe bot with Rx controlled by one BS2 with a Tx, and there will be another identical set. I have programmed such that one Rx will wait for "!", and the other Rx will wait for "?". There is a pulseout of 1200 from each Tx and a short pause of 10ms. However, there is a big problem as the frequency of both pair of Tx and Rx are the same and they interferred with each other. Is there any other way around this? thanks in advance.
quekyt

SRLM

You'll probably need two more receivers to pair with the transmitters, or transmit with only one transmitter. The problem is that one transmitter starts transmitting, then the second (which is blind to airwave occupancy) starts to transmit itself. So, if your setup can accommodate it, try transmitting from one transmitter. You'll still need to keep the header (? or !) so that the receivers can know which data to accept.

quekyt

thanks for the reply. i will try it out, it is actually a game where 2 guys are racing each other there it will be better if there are 2 sets of transmitters and receivers so there are 2 controllers and 2 boe bots.

Manetheren

Unless you can control the header file for the individual Bot you might have troubles as they will be the same frequency.

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Tia'Shar Manetheren

Chris Savage

One robot can transmit for both receivers…So you only need to coordinate your input into whatever is sending both messages out and definitely prefix the data. Keep your packet size small so you can get more throughput. Take care.

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Chris Savage
Parallax Engineering

quekyt

thanks for all the reply, so i guess it is not easy to work wtih 2 pairs of Parallax transmitter and receiver. so one solution is to use only one transmitter and many receivers or to get another pair of tx and rx from other supplier of other frequency as parallax has only one frequency.

SRLM

quekyt said...
thanks for all the reply, so i guess it is not easy to work wtih 2 pairs of Parallax transmitter and receiver. so one solution is to use only one transmitter and many receivers or to get another pair of tx and rx from other supplier of other frequency as parallax has only one frequeny.

It's not the modules, it's physics that are the problem. Unless you get some more advanced modules that automatically do interference detection and frequency hopping, you'll need to come up with a solution that works for your project. If it's not feasible to take out one transmitter, you'll probably have to add two receivers. Of course, you could get another pair on a different frequency from somewhere.