about RF
I·try to use ·RF transceiver package to compose bi-direction communication between pc and BS2.when·I test one direction individually
(pc to bs2 or bs2 to pc) ,everything was okay..but when·I connect two transistor at the same time, here comes the trouble.....my receiver got
lots of·incorrect·information.· I just connect 5V,GND,ADTA Pin· of transistor and receiver,and my code were just use serout command to sent data.
Is any important thing·about bi-direction communication I·have to do ?
(pc to bs2 or bs2 to pc) ,everything was okay..but when·I connect two transistor at the same time, here comes the trouble.....my receiver got
lots of·incorrect·information.· I just connect 5V,GND,ADTA Pin· of transistor and receiver,and my code were just use serout command to sent data.
Is any important thing·about bi-direction communication I·have to do ?
Comments
·
·· During bi-directional communication with the systems on the same frequency/channel you need to be sure only one side is talking at any given time.· The easiest way to do this is to designate one as the host and the other as the remote.· The host will query the remote for information or initiate all communication when it’s ready.· I hope this helps.
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Chris Savage
Parallax Tech Support
yes, i had try it before. I use PDN pin to cotrol two transistor when one is sending data the PDN is high ,the other's PDN is low.
But the data wasn't 100% correct .Maybe just a part of data or even no any part of data displayed on my pc but jsut like press an enter to change line. What's the problem is??? Please tell me, thanks!!
One signal will overpower the other signal, or else the receiver will try receiving both signals simultaneously, in which case it will receive pieces of info from each signal.
If you want to transmit & receive simultaneously, you need to use different frequencies between the tranceiver pairs. So if you have two frequencies, A and B, it would look like this:
PC: transmit on freq A, receive on freq B
BS1: transmit on freq B, receive on freq A
I know the interfere between two transisor with same frequency ,but I'm not familiar with RF device really.So , I don't know which RF device's frequency is not 433MHz .
If any RF device's frequency is not 433MHz, the problem will be very simple.
Can you recommand me some Rf device to use ?? thanks
This has been covered elsewhere in the forum.
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Truly Understand the Fundamentals and the Path will be so much easier...
http://www.selmaware.com/appbee
-Martin
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Martin Hebel
StampPlot - Graphical Data Acquisition and Control
AppBee -·2.4GHz Wireless Adapters & transceivers·for the BASIC Stamp & Other controllers·