mirror of https://github.com/merbanan/rtl_433.git
123 lines
5.2 KiB
C
123 lines
5.2 KiB
C
/** @file
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Schou 72543 Day Rain Gauge.
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contributed by Jesper M. Nielsen
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discovered by Jesper M. Nielsen
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based upon ambient_weather.c
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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*/
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#include "decoder.h"
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/**
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Decode Schou 72543 Rain Gauge, DAY series.
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Devices supported:
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- Schou 72543 Rain Gauge, DAY Series.
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- Motonet MTX rain gauge (Product code: 86-01352) sold in Finland.
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- MarQuant Wireless Rain Gauge (Product code: 014369) sold by JULA AB, Sweden.
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This decoder handles the 433mhz rain-thermometer.
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Codes example: {66}50fc467b7f9a832a8, {65}a1f88cf6ff3506550, {70}a1f88cf6ff3506557c
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{66}: [ 0 ] [ 1010 0001 1111 1000 ] [ 1000 ] [ 1100 ] [ 1111 0110 ] [ 1111 1111 ] [ 0011 0101 ] [ 0000 0110 ] [ 0101 0101 ] [ 0 ]
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{65}: [ 1010 0001 1111 1000 ] [ 1000 ] [ 1100 ] [ 1111 0110 ] [ 1111 1111 ] [ 0011 0101 ] [ 0000 0110 ] [ 0101 0101 ] [ 0 ]
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{70}: [ 1010 0001 1111 1000 ] [ 1000 ] [ 1100 ] [ 1111 0110 ] [ 1111 1111 ] [ 0011 0101 ] [ 0000 0110 ] [ 0101 0101 ] [ 0111 11 ]
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KEY: [ 0 ] [ IIII IIII IIII IIII ] [ SSSS ] [ NNNN ] [ rrrr rrrr ] [ RRRR RRRR ] [ tttt tttt ] [ TTTT TTTT ] [ CCCC CCCC ] [ 0??? ?? ]
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- 0: Always zero
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- ?: Either 1 or 0
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- I: 16 bit random ID. Resets to new value after every battery change
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- S: Status bits
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[ X--- ]: Battery status: 0: OK, 1: Low battery
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[ -X-- ]: Repeated signal: 0: New, 1: Repeat of last message (4 repeats will happen after battery replacement)
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[ --XX ]: Assumed always to be 0
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- N: 4 bit running count. Increased by 2 every value incremented by 2 every message, i.e. 0, 2, 4, 6, 8, a, c, e, 0, 2...
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- Rr: 16 bit Rainfall in 1/10 millimeters per count. Initial value fff6 = 6552.6 mm rain
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r: lower 8 bit, initializes to f6
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R: Upper 8 bit, initializes to ff
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- Tt: 16 bit temperature.
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t: lower 8 bit
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T: Upper 8 bit
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- C: Checksum. Running 8 bit sum of the data left of the checksum.
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E.g. {65}a1f88cf6ff3506'55'0 Checksum is 55 obtained as ( a1 + f8 + 8c + f6 + ff + 35 + 06 ) = 455 i.e. 55
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*/
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static int schou_72543_rain_decode(r_device *decoder, bitbuffer_t *bitbuffer)
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{
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// Full data is 3 rows, two are required for data validation
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if (bitbuffer->num_rows < 2) {
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return DECODE_ABORT_LENGTH;
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}
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// Check if the first 64 bits of at least two rows are alike
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int row = bitbuffer_find_repeated_prefix(bitbuffer, 2, 64);
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if (row < 0) {
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return DECODE_ABORT_EARLY;
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}
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// Load bitbuffer data and validate checksum
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uint8_t *b = bitbuffer->bb[row];
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int micsum = b[7]; // Checksum as read
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int calsum = add_bytes(b, 7) & 0x0FF; // Checksum as calculated, accounting for the lowest 8 bit
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if (micsum != calsum) {
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decoder_logf_bitrow(decoder, 1, __func__, b, 65, "Checksum error, expected: %02x calculated: %02x", micsum, calsum);
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return DECODE_FAIL_MIC;
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}
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// Decode message
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int device_id = (b[0] << 8) | b[1]; // Assuming little endian, but it not important as the value is random
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int battery_low = (b[2] & 0x80) > 0; // if one, battery is low
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int message_repeat = (b[2] & 0x40) > 0; // if one, message is a repeat (startup after batteries are replaced)
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int message_counter = (b[2] & 0x0e) >> 1; // 3 bit counter (rather than 4 bit incrementing by 2 each time
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float rain_mm = ((b[4] << 8) | b[3]) * 0.1f; // 0.0 to 6553.5 mm
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float temperature_F = (((b[6] << 8) | b[5]) - 900) * 0.1f; // -40.0 to +158 degF
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/* clang-format off */
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data_t *data = data_make(
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"model", "", DATA_STRING, "Schou-72543",
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"id", "ID", DATA_INT, device_id,
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"temperature_F", "Temperature", DATA_FORMAT, "%.1f F", DATA_DOUBLE, temperature_F,
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"rain_mm", "Rain", DATA_FORMAT, "%.1f mm", DATA_DOUBLE, rain_mm,
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"battery_ok", "Battery_ok", DATA_INT, !battery_low,
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"msg_counter", "Counter", DATA_INT, message_counter,
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"msg_repeat", "Msg_repeat", DATA_INT, message_repeat,
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"mic", "Integrity", DATA_STRING, "CHECKSUM",
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NULL);
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/* clang-format on */
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decoder_output_data(decoder, data);
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return 1;
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}
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static char const *const output_fields[] = {
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"model",
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"id",
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"temperature_F",
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"rain_mm",
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"battery_ok",
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"msg_counter",
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"msg_repeat",
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"mic",
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NULL,
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};
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r_device const schou_72543_rain = {
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.name = "Schou 72543 Day Rain Gauge, Motonet MTX Rain, MarQuant Rain Gauge, TFA Dostmann 30.3252.01/47.3006.01 Rain Gauge and Thermometer, ADE WS1907",
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.modulation = OOK_PULSE_PWM,
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.short_width = 972,
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.long_width = 2680,
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.sync_width = 7328,
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.reset_limit = 2712,
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.decode_fn = &schou_72543_rain_decode,
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.fields = output_fields,
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};
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