add README file to describe project and all other files
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The Linear ACT-34B is a gate remote.
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product page: http://www.linearcorp.com/product_detail.php?productId=867
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manual: http://www.linearcorp.com/pdf/manuals/ACT-31B_ACT-34B.pdf
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FCCID: EF4ACP00872
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The Linear ACT-31B is the same than the ACT-34B, but have only one button instead of four.
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The Monarch 318LIPW1K(-L) is a compatible/clone of the Linear ACT-31B.
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product page: http://www.communitycontrols.com/Product/?PID=196
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manual: http://s3.amazonaws.com/CommunityControls/PDFs/CC-Monarch-318LIPw1K.pdf
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FCCID: SU7318LIPW1K
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megacode
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========
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The value is encoded using Linear LLC MegaCode scheme.
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It uses AM/ASK/A1D pulse position for the radio signal.
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The radio transmission uses the 318MHz frenquency.
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The signal is encoded using Linear LLC MegaCode scheme.
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It uses AM/ASK/A1D pulse position for the radio signal.
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24 bits are transmitted:
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- 1 sync bit
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- 16 bits for the remote code
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- 4 bits for the facility code
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- 3 bits for data bits (the channel/button used)
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24 bursts are transmitted, plus 1 blank burst, within 150 ms.
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Each burst is a 6 ms bitframe.
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Withing the burst there is a 1 ms pulse after 2 or 5 ms.
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The blank burst does not include a pluse and is used to separate transmissions.
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The first pulse is used to synchronize and is alwasy after 5ms within the burst.
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sdr
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===
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This folder contains tools to be used with Software Defined Radio (SDR).
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A RTL-SDR has been used to capture the signal.
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Use *sdrangelove* to figure out the frequency.
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It is around 318MHz, but +/- 100kHz.
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Use *rtl_fm* to record the transmission:
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rtl_fm -f 317.962M -M am megacode.pcm
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A few remote transmissions have been captured and the recordings are saved in *samples*
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*megacode.pcm* will have signed 16 bits little endian sample, at 24000Hz.
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Use *decode.rb* to decode this recording:
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./decode.rb megacode.pcm
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To record is an opprotunistic way (someone uses an unknown remote further away), you have to tweak *rtl_fm*:
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rtl_fm -f 317.9M:318.1M:20k -g 10 -l 700 -M am megacode.pcm
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pic
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===
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This folder contains firmwares for the transmitter and receiver microcontrollers.
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The PCB of the ACT-31B is the same than the ACT-34B, with only one switch out of four populated.
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It uses a PIC12C508A (SM package) microcontroller.
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This microcontroller is EEPROM based (designated by the 'C' in the name) which the PICkit 2 can't program.
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It is programmed using the test points, but only once since it's a One Time Programmable (OTP) chip.
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A pin compatible flash based chip can be used instead.
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Most P12FXXX are, like the PIC12F629/PIC12F675 (simplest alternative), PIC12F617 (more flash but no EEPROM), and PIC12F1840 (high end).
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They come in SN packages, which is thiner then the original SM package.
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But the pitch is the same and the pins can be soldered on the pads.
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The 318LIPW1K uses a re-programmable chip (flash based).
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It uses a PIC12F629 (SN package) microcontroller.
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Monarch also adversitve that the code is programmable.
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I could not find the software.
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The programming header is even present on the board.
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But the microcontroller has read protection enabled.
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