Thank you very much Dave, I really appreciate your help!!
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Thank you very much Dave, I really appreciate your help!!
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The FM transmitter/receiver pair you're working with are rather costly for this type application, especially if you are planning on several sensors. You can reduce the cost by using ASK modules like those I list on my web page (or those designed/sold by Ioannis, one of the regulars here) and using a simple protocol like the one I've posted an example of in the Code Examples forum.
Last edited by dhouston; - 23rd October 2007 at 20:22.
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Thx Dave!
I was actually looking for a cheaper option, but did not know what to look for.
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What is a typical application for a FSK chip?
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I have updated my circuit to monitor the CD pin on the Receiver
If high, I turn on an LED, but the LED switch on about every 10 seconds while the transmitter is still switched off?
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I'm not sure what you're saying. If you are using the recommended circuit (p6 of the PDF), the /CD signal goes low when there is a signal.Originally Posted by koossa
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Oops!!
I must have missed it and just assumed it must be high, sorry!
Will this code do the job to just test the CD pin functioning?
<code>
........
IF CDPin = 0 THEN
HIGH LEDPin
Pause 1000
LOW LEDPin
PAUSE 1000
ENDIF
.......
</code>
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FSK is needed when higher data rates are desired. The pair you're using can go as high as 160kbps while ASK modules are usually limited to 4-8kbps. In simple terms, ASK is like AM radio which is subject to interference while FSK is like FM which has better noise rejection.
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