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[rtl-433.git] / src / devices / wt450.c

diff --git a/src/devices/wt450.c b/src/devices/wt450.c
new file mode 100644 (file)
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+++ b/src/devices/wt450.c
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+/* wt450 wireless weather sensors protocol
+ *
+ * Tested devices:
+ * WT260H
+ * WT405H
+ *
+ * Copyright (C) 2015 Tommy Vestermark
+ * Copyright (C) 2015 Ladislav Foldyna
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ source from:
+ http://ala-paavola.fi/jaakko/doku.php?id=wt450h
+
+
+ The signal is FM encoded with clock cycle around 2000 µs
+ No level shift within the clock cycle translates to a logic 0
+ One level shift within the clock cycle translates to a logic 1
+ Each clock cycle begins with a level shift
+ My timing constants defined below are those observed by my program
+
+ +---+   +---+   +-------+       +  high
+ |   |   |   |   |       |       |
+ |   |   |   |   |       |       |
+ +   +---+   +---+       +-------+  low
+ ^       ^       ^       ^       ^  clock cycle
+ |   1   |   1   |   0   |   0   |  translates as
+
+ Each transmission is 36 bits long (i.e. 72 ms)
+
+ Data is transmitted in pure binary values, NOT BCD-coded.
+*/
+
+
+/*
+ * Outdoor sensor transmits data temperature, humidity.
+ * Transmissions also include channel code and house code. The sensor transmits
+ * every 60 seconds 3 packets.
+ *
+ * 1100 0001 | 0011 0011 | 1000 0011 | 1011 0011 | 0001
+ * xxxx ssss | ccxx bhhh | hhhh tttt | tttt tttt | tttp
+ *
+ * x - constant
+ * s - House code
+ * c - Channel
+ * b - battery indicator (0=>OK, 1=>LOW)
+ * h - Humidity
+ * t - Temperature
+ * p - parity (xor of all bits should give 0)
+ */
+
+#include "rtl_433.h"
+#include "util.h"
+#include "pulse_demod.h"
+#include "data.h"
+
+static int wt450_callback(bitbuffer_t *bitbuffer) {
+
+   bitrow_t *bb = bitbuffer->bb;
+   uint8_t *b = bb[0];
+
+   uint8_t humidity = 0;
+   uint8_t temp_whole = 0;
+   uint8_t temp_fraction = 0;
+   uint8_t house_code = 0;
+   uint8_t channel = 0;
+   uint8_t battery_low = 0;
+   float temp = 0;
+   uint8_t bit;
+   uint8_t parity = 0;
+
+   char time_str[LOCAL_TIME_BUFLEN];
+   data_t *data;
+   local_time_str(0, time_str);
+
+//bitbuffer_print(bitbuffer);
+
+   if ( bitbuffer->bits_per_row[0] != 36 )
+   {
+      if (debug_output) 
+         fprintf(stderr, "%s wt450_callback: wrong size of bit per row %d\n",
+                 time_str, bitbuffer->bits_per_row[0] );
+
+      return 0;
+   }
+
+   if ( b[0]>>4 != 0xC )
+   {
+      if (debug_output)
+      {
+         fprintf(stderr, "%s wt450_callback: wrong preamble\n", time_str);
+         bitbuffer_print(bitbuffer);
+      }
+      return 0;
+   }
+
+   for ( bit = 0; bit < bitbuffer->bits_per_row[0]; bit++ )
+   {
+      parity ^= (b[bit/8] & (0x80 >> (bit % 8))) ? 1 : 0;
+   }
+
+   if ( parity )
+   {
+      if (debug_output)
+      {
+         fprintf(stderr, "%s wt450_callback: wrong parity\n", time_str);
+         bitbuffer_print(bitbuffer);
+      }
+      return 0;
+   }
+
+   house_code = b[0] & 0xF;
+   channel = (b[1] >> 6) + 1;
+   battery_low = b[1] & 0x8;
+   humidity = ((b[1] & 0x7) << 4) + (b[2] >> 4);
+   temp_whole = (b[2] << 4) + (b[3] >> 4);
+   temp_fraction = ((b[3] & 0xF) << 3) + (b[4] >> 5);
+   temp = (temp_whole - 50) + (temp_fraction/100.0);
+
+   data = data_make("time",          "",          DATA_STRING, time_str,
+                   "model",         "",           DATA_STRING, "WT450 sensor",
+                   "id",            "House Code", DATA_INT, house_code,
+                   "channel",       "Channel",    DATA_INT, channel,
+                   "battery",       "Battery",    DATA_STRING, battery_low ? "LOW" : "OK",
+                   "temperature_C", "Temperature",DATA_FORMAT, "%.02f C", DATA_DOUBLE, temp,
+                   "humidity",      "Humidity",   DATA_FORMAT, "%u %%", DATA_INT, humidity,
+                   NULL);
+   data_acquired_handler(data);
+
+   return 1;
+}
+
+PWM_Precise_Parameters clock_bits_parameters_generic = {
+   .pulse_tolerance    = 20,
+   .pulse_sync_width   = 0,    // No sync bit used
+};
+
+static char *output_fields[] = {
+       "time",
+       "model",
+       "id",
+       "channel",
+       "battery",
+       "temperature_C",
+       "humidity",
+       NULL
+};
+
+r_device wt450 = {
+   .name          = "WT450",
+   .modulation    = OOK_PULSE_CLOCK_BITS,
+   .short_limit   = 980,
+   .long_limit    = 1952,
+   .reset_limit   = 18000,
+   .json_callback = &wt450_callback,
+   .disabled      = 0,
+   .demod_arg     = (uintptr_t)&clock_bits_parameters_generic,
+   .fields        = output_fields
+};