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diff --git a/trasmitter/README.rst.txt b/trasmitter/README.rst.txt new file mode 100644 index 0000000..78200a4 --- /dev/null +++ b/trasmitter/README.rst.txt @@ -0,0 +1,42 @@ +Some links: + +* capturing radio signals + http://www.stevenhale.co.uk/main/2013/08/home-automation-reverse-engineering-a-worcester-bosch-dt10rf-wireless-thermostat/ + https://damn.technology/controlling-british-gas-wr1-receiver-arduino + http://rossharper.net/2015/11/decoding-a-siemens-rcr10433-thermostat-signal-to-control-a-boiler-from-a-raspberry-pi/ + +IMPORTANT: the transmitter prefers 3.3V, it stops working after a +while on 5V. + +Reveng +====== + +Sampled at 192k samples/second, found that the transmissions had 3 +types of (presumably square) pulses: + +======== ======= ======== +name samples duration +======== ======= ======== +narrow 200 ~ 1ms +middle 300 ~ 1.5ms +wide 400 ~ 2ms +======== ======= ======== + +The two sequences are: + +* ``nnnnnnWnWnnMnnMnnnnnWnnnnMnMWn`` +* ``nnnnnnWnWnnMnnMnnnnnnnnnnWMMWn`` + +Actually no, the pulses are not ½ high and ½ low, they're shaped +weird. The source code has the correct widths. + +Without Arduino +=============== + +The GPIO / XIO pins on NextThing's CHIP, even when driven via the `slow +sysfs interface`_, seem to be fast enough for our purposes. + +See the ``sender-chip.pl`` test program. + +If we keep the ``*/value`` file open, we get good enough timing. The +``sender-chip.c`` program works. |