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Michael Karas
09/04/12 01:14
Read: 1088 times
Beaverton Or

#188222 - A Manchester Modulation Scheme
Responding to: ???'s previous message
The link here points to a PDF file that describes the type of modulation that I have used for RF transmit and receiving.

The above doc is stored off at GoogleDocs for sharing purposes. The file sharing on this site hasn been fully broken since Craig Steiner recovered his crashed web site server.

The transmitter uses a periodic 1 msec timer interrupt to key a state machine which sends the specified bytes with Manchester encoding.

The receiver uses two interrupts, one off each edge of the received Manchester encoded waveform, to drive a decoding state machine.

This diagram shows the raw data format. It is up to the user to incorporate any multi target addressing and packet format on top of the shown protocol is this is required for your application.

In my usage I was just implementing a simple point to point RF communications scheme that sends RTC data from a master clock station to several remote time display modules. So for my application the data sent was simply mmddyyyy hhmmss type data. I depended in a robust detection of the received Manchester data pattern as the validator of the data transmission.

Michael Karas

List of 14 messages in thread
sample source code 433Mhz rf remote C soure code       Vaka Kiran Kumar      09/03/12 06:13      
   Which RF module are you using? ... provide a link, please      Richard Erlacher      09/03/12 10:33      
   Eh??      Andy Neil      09/03/12 14:13      
      RF remote      Vaka Kiran Kumar      09/03/12 22:04      
         Are You Willing....      Michael Karas      09/03/12 23:26      
         A Manchester Modulation Scheme      Michael Karas      09/04/12 01:14      
         Manchester RF Receiver      Michael Karas      09/04/12 01:22      
         Manchester RF Transmitter      Michael Karas      09/04/12 01:27      
            How effective is the 433MHz      David Prentice      09/04/12 03:14      
               Half Duplex      Michael Karas      09/04/12 11:34      
         Where's the link to the datasheet?      Richard Erlacher      09/04/12 08:38      
            please fined teh atatched zip      Vaka Kiran Kumar      09/05/12 04:42      
               Please provide access to your C: drive      Erik Malund      09/05/12 07:10      
               Hacking activated        Per Westermark      09/05/12 08:21      

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