Sony SIRC IR Decoder for PIC 16F88

Download as PDF

Decodes 12, 15 and 20 bit SIRC data streams

Tested with following Sony Remotes;

• RM-U215
• RMT-D166P
• RM-S325

Connections:

• Connect IR Receiver module TTL output to PIC RB0/INT input (use TSOP2238, TSOP1738 or similar)
• Optional monitor LED to PIC RA1 output
• Decoded SIRC data is transmitted as async' serial data from RB5/TX output. ( 38.4Kbs 8N1 )
  
  Configured to use internal RC oscillator at 8Mhz so no external crystal required.
  Do use a 100nF decoupling capacitor on the 5volt supply

beta Code download

Sample output

• command word         -> cNNNNNNNN
• device word          -> dNNNNNNNN
• 20 bit extended word -> xNNNNNNNN
• detected bit stream length [12 | 15 | 20 ] -> NN
• start pulse error -> S
• data pulse error  -> D

With the Sony remotes tested, a single press of any button results in the same
code being sent three times in succession.

If the button is held down it will repeat the code indefinitely, but always a
minimum of three times.

Output from TSOP2238 IR PCM Receiver