+/* WG-PB12V1 Temperature Sensor
+ * ---
+ * Device method to decode a generic wireless temperature probe. Probe marked
+ * with WG-PB12V1-2016/11.
+ *
+ * Format of Packets
+ * ---
+ * The packet format appears to be similar those the Lacrosse format.
+ * (http://fredboboss.free.fr/articles/tx29.php)
+ *
+ * AAAAAAAA ????TTTT TTTTTTTT ???IIIII HHHHHHHH CCCCCCCC
+ *
+ * A = Preamble - 11111111
+ * ? = Unknown - possibly battery charge
+ * T = Temperature - see below
+ * I = ID of probe is set randomly each time the device is powered off-on,
+ * Note, base station has and unused "123" symbol, but ID values can be
+ * higher than this.
+ * H = Humidity - not used, is always 11111111
+ * C = Checksum - CRC8, polynomial 0x31, initial value 0x0, final value 0x0
+ *
+ * Temperature
+ * ---
+ * Temperature value is "milli-celcius", ie 1000 mC = 1C, offset by -40 C.
+ *
+ * 0010 01011101 = 605 mC => 60.5 C
+ * Remove offset => 60.5 C - 40 C = 20.5 C
+ *
+ * Unknown
+ * ---
+ * Possbible uses could be weak battey, or new battery.
+ *
+ * At the moment it this device cannot distinguish between a Fine Offset
+ * device, see fineoffset.c.
+ *
+ * Copyright (C) 2015 Tommy Vestermark
+ * Modifications Copyright (C) 2017 Ciarán Mooney
+ *
+ * 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.
+ */
+
+#include "rtl_433.h"
+#include "data.h"
+#include "util.h"
+
+static int wg_pb12v1_callback(bitbuffer_t *bitbuffer) {
+ /* This function detects if the packet (bitbuffer) is from a WG-PB12V1
+ * sensor, and decodes it if it passes the checks.
+ */
+
+ bitrow_t *bb = bitbuffer->bb;
+ data_t *data;
+
+ char time_str[LOCAL_TIME_BUFLEN];
+
+ uint8_t id;
+ int16_t temp;
+ float temperature;
+ uint8_t humidity;
+ char io[49];
+
+ const uint8_t polynomial = 0x31; // x8 + x5 + x4 + 1 (x8 is implicit)
+
+ // Validate package
+ if (bitbuffer->bits_per_row[0] >= 48 && // Don't waste time on a short packages
+ bb[0][0] == 0xFF && // Preamble
+ bb[0][5] == crc8(&bb[0][1], 4, polynomial, 0) && // CRC (excluding preamble)
+ bb[0][4] == 0xFF // Humitidy set to 11111111
+ ){
+
+ /* Get time now */
+ local_time_str(0, time_str);
+
+ // Nibble 7,8 contains id
+ id = ((bb[0][3]&0x1F));
+
+ // Nibble 5,6,7 contains 12 bits of temperature
+ // The temperature is "milli-celcius", ie 1000 mC = 1C, offset by -40 C.
+ temp = ((bb[0][1] & 0x0F) << 8) | bb[0][2];
+ temperature = ((float)temp / 10)-40;
+
+ // Populate string array with raw packet bits.
+ for (uint16_t bit = 0; bit < bitbuffer->bits_per_row[0]; ++bit){
+ if (bb[0][bit/8] & (0x80 >> (bit % 8))){
+ io[bit] = 49; // 1
+ }
+ else {
+ io[bit] = 48; // 0
+ }
+ }
+ io[48] = 0; // terminate string array.
+
+ if (debug_output > 1) {
+ fprintf(stderr, "ID = 0x%2X\n", id);
+ fprintf(stderr, "temperature = %.1f C\n", temperature);
+ }
+
+ data = data_make("time", "", DATA_STRING, time_str,
+ "model", "", DATA_STRING, "WG-PB12V1",
+ "id", "ID", DATA_INT, id,
+ "temperature_C", "Temperature", DATA_FORMAT, "%.01f C", DATA_DOUBLE, temperature,
+ "io", "io", DATA_STRING, io,
+ NULL);
+ data_acquired_handler(data);
+ return 1;
+ }
+ return 0;
+}
+
+static char *output_fields[] = {
+ /* Defines the output files for this device function.
+ */
+ "time",
+ "model",
+ "id",
+ "temperature_C",
+ "io",
+ NULL
+};
+
+r_device wg_pb12v1 = {
+ /* Defines object information for use in other parts of RTL_433.
+ */
+ .name = "WG-PB12V1",
+ .modulation = OOK_PULSE_PWM_RAW,
+ .short_limit = 650, // Short pulse 564µs, long pulse 1476µs, fixed gap 960µs
+ .long_limit = 1550, // Maximum pulse period (long pulse + fixed gap)
+ .reset_limit = 2500, // We just want 1 package
+ .json_callback = &wg_pb12v1_callback,
+ .disabled = 0,
+ .demod_arg = 0,
+ .fields = output_fields
+};
projects / rtl-433.git / blobdiff