src/devices/mebus.c

   1 #include "rtl_433.h"
   2 #include "util.h"
   3
   4 static int mebus433_callback(bitbuffer_t *bitbuffer) {
   5     bitrow_t *bb = bitbuffer->bb;
   6     char    time_str[LOCAL_TIME_BUFLEN];
   7     int16_t temp;
   8     int8_t  hum;
   9     uint8_t address;
  10     uint8_t channel;
  11     uint8_t battery;
  12     uint8_t unknown1;
  13     uint8_t unknown2;
  14     data_t *data;
  15
  16     if (bb[0][0] == 0 && bb[1][4] !=0 && (bb[1][0] & 0b01100000) && bb[1][3]==bb[5][3] && bb[1][4] == bb[12][4]){
  17         local_time_str(0, time_str);
  18
  19         address = bb[1][0] & 0b00011111;
  20
  21         channel = ((bb[1][1] & 0b00110000) >> 4) + 1;
  22         // Always 0?
  23         unknown1 = (bb[1][1] & 0b01000000) >> 6;
  24         battery = bb[1][1] & 0b10000000;
  25
  26         // Upper 4 bits are stored in nibble 1, lower 8 bits are stored in nibble 2
  27         // upper 4 bits of nibble 1 are reserved for other usages.
  28         temp = (int16_t)((uint16_t)(bb[1][1] << 12) | bb[1][2] << 4);
  29         temp = temp >> 4;
  30         // lower 4 bits of nibble 3 and upper 4 bits of nibble 4 contains
  31         // humidity as decimal value
  32         hum  = (bb[1][3] << 4 | bb[1][4] >> 4);
  33
  34         // Always 0b1111?
  35         unknown2 = (bb[1][3] & 0b11110000) >> 4;
  36
  37         data = data_make("time",          "",            DATA_STRING, time_str,
  38                          "model",         "",            DATA_STRING, "Mebus/433",
  39                          "id",            "Address",     DATA_INT, address,
  40                          "battery",       "Battery",     DATA_STRING, battery ? "OK" : "LOW",
  41                          "channel",       "Channel",     DATA_INT, channel,
  42                          "unknown1",      "Unknown 1",   DATA_INT, unknown1,
  43                          "unknown2",      "Unknown 2",   DATA_INT, unknown2,
  44                          "temperature_C", "Temperature", DATA_FORMAT, "%.02f C", DATA_DOUBLE, temp / 10.0,
  45                          "humidity",      "Humidity",    DATA_FORMAT, "%u %%", DATA_INT, hum,
  46                          NULL);
  47         data_acquired_handler(data);
  48
  49
  50         return 1;
  51     }
  52     return 0;
  53 }
  54
  55 r_device mebus433 = {
  56     .name           = "Mebus 433",
  57     .modulation     = OOK_PULSE_PPM_RAW,
  58     .short_limit    = 1200,
  59     .long_limit     = 2400,
  60     .reset_limit    = 6000,
  61     .json_callback  = &mebus433_callback,
  62     .disabled       = 0,
  63     .demod_arg      = 0,
  64 };