RFID Hacking/parallax

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some random notes about the parallax readers

  • em4095 to pic16f627a (20pin ssop package)
    • DEMOD_OUT (13) -> RB3/CCP1 (10)
    • RDY/CLK (2) -> RB6/T1OSO/T1CKI/PGC (13)
    • SHD (14) -> RA1/AN1
  • pic16f627a to edge connector
    • RB0/INT (7) -> OE#
    • RB2/TX/CK (9) -> SOUT
  • pic16f627a to discretes
    • RA7/OSC1/CLKIN (18) -> LED (1)
    • RA6/OSC2/CLKOUT (17) -> LED (2)
  • em4095 xmit is controlled by MOD (12)
    • this follows the same modulation scheme as DEMOD_OUT (13)
  • edge connector
    • SOUT wiggles at 2400bps and outputs rfid in ASCII (no need to do binary conversion)
    • /ENABLE
      • this is an input signal (tying this to GND works fine if you just want the reader to stream data).
      • the leading / means that this signal is active low

i'm working on resuscitating my pic programmer (althought hey aren't that expensive on ebay) to read out the existing program to modify the board to clone. however, the led pins overlap w/ the programmer's CLOCK and DATA signals. these are inputs so it should probably be ok to drive these (from the programmer) w/ both the pic and leds connected.

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