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Add support for Conrad S3318P
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@mnhauke
mnhauke committed Feb 8, 2016
1 parent 5869fd3 commit d2fe3a0
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Showing 5 changed files with 152 additions and 3 deletions.
2 changes: 1 addition & 1 deletion include/rtl_433.h
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Expand Up @@ -35,7 +35,7 @@
#define DEFAULT_LEVEL_LIMIT 8000 // Theoretical high level at I/Q saturation is 128x128 = 16384 (above is ripple)
#define MINIMAL_BUF_LENGTH 512
#define MAXIMAL_BUF_LENGTH (256 * 16384)
#define MAX_PROTOCOLS 45
#define MAX_PROTOCOLS 46
#define SIGNAL_GRABBER_BUFFER (12 * DEFAULT_BUF_LENGTH)

/* Supported modulation types */
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3 changes: 2 additions & 1 deletion include/rtl_433_devices.h
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Expand Up @@ -48,7 +48,8 @@
DECL(oil_watchman) \
DECL(current_cost) \
DECL(emontx) \
DECL(ht680)
DECL(ht680) \
DECL(s3318p)

typedef struct {
char name[256];
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1 change: 1 addition & 0 deletions src/CMakeLists.txt
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Expand Up @@ -64,6 +64,7 @@ add_executable(rtl_433
devices/waveman.c
devices/wt450.c
devices/x10_rf.c
devices/s3318p.c

)

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3 changes: 2 additions & 1 deletion src/Makefile.am
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Expand Up @@ -49,7 +49,8 @@ rtl_433_SOURCES = baseband.c \
devices/valeo.c \
devices/waveman.c \
devices/wt450.c \
devices/x10_rf.c
devices/x10_rf.c \
devices/s3318p.c


rtl_433_LDADD = $(LIBRTLSDR) $(LIBM)
146 changes: 146 additions & 0 deletions src/devices/s3318p.c
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@@ -0,0 +1,146 @@
#include "rtl_433.h"
#include "data.h"
#include "util.h"

/* Conrad Electronics S3318P outdoor sensor
*
* Transmit Interval: every ~50s
* Message Format: 40 bits (10 nibbles)
*
*
* Nibble: 1 2 3 4 5 6 7 8 9 10
* Type: PP IIIIIIII ??CCTTTT TTTTTTTT HHHHHHHH XB?????? PP
* BIT/8 00 01234567 01234567 01234567 01234567 01234567 00
* BIT/A 00 01234567 89012345 57890123 45678901 23456789 00
* 0 1 2 3
* I = sensor ID (changes on battery change)
* C = channel number
* T = temperature
* H = humidity
* X = tx-button pressed
* B = low battery
* P = Pre-/Postamble
* ? = unknown meaning
*
*
* [01] {42} 04 15 66 e2 a1 00 : 00000100 00010101 01100110 11100010 10100001 00 ---> Temp/Hum/Ch:23.2/46/1
*
* Temperature:
* Sensor sends data in °F, lowest supported value is 90°F
* 12 bit uingned and scaled by 10 (Nibbles: 6,5,4)
* in this case "011001100101" = 1637/10 - 90 = 73.7 °F (23.17 °C)
*
* Humidity:
* 8 bit unsigned (Nibbles 8,7)
* in this case "00101110" = 46
*
* Channel number: (Bits 10,11) + 1
* in this case "00" --> "00" +1 = Channel1
*
* Battery status: (Bit 33) (0 normal, 1 voltage is below ~2.7 V)
* TX-Button: (Bit 32) (0 indicates regular transmission, 1 indicates requested by pushbutton)
*
* Rolling Code / Device ID: (Nibble 1)
* changes on every battery change
*
* Unknown1: (Bits 8,9) changes not so often
* Unknown2: (Bits 36-39) changes with every packet, probably checksum
* Unknown3: (Bits 34,35) changes not so often, mayby also part of the checksum
*
*/


static int s3318p_callback(bitbuffer_t *bitbuffer) {
bitrow_t *bb = bitbuffer->bb;
data_t *data;
char time_str[LOCAL_TIME_BUFLEN];

/* Get time now */
local_time_str(0, time_str);

/* Reject codes of wrong length */
if ( 42 != bitbuffer->bits_per_row[1])
return 0;

/* shift all the bits left 2 to align the fields */
int i;
for (i = 0; i < BITBUF_COLS-1; i++) {
uint8_t bits1 = bb[1][i] << 2;
uint8_t bits2 = (bb[1][i+1] & 0xC0) >> 6;
bits1 |= bits2;
bb[1][i] = bits1;
}

uint8_t humidity;
uint8_t button;
uint8_t battery_low;
uint8_t channel;
uint8_t sensor_id;
uint16_t temperature_with_offset;
float temperature_f;

/* IIIIIIII ??CCTTTT TTTTTTTT HHHHHHHH XB?????? PP */
humidity = (uint8_t)(((bb[1][3] & 0x0F) << 4) | ((bb[1][3] & 0xF0) >> 4));
button = (uint8_t)(bb[1][4] >> 7);
battery_low = (uint8_t)((bb[1][4] & 0x40) >> 6);
channel = (uint8_t)(((bb[1][1] & 0x30) >> 4) + 1);
sensor_id = (uint8_t)(bb[1][0]);

temperature_with_offset = (uint16_t)(((bb[1][2] & 0x0F) << 8) | (bb[1][2] & 0xF0) | (bb[1][1] & 0x0F));
temperature_f = (float)((temperature_with_offset - 900) / 10.0);

if (debug_output) {
bitbuffer_print(bitbuffer);
fprintf(stderr, "Sensor ID = %2x\n", sensor_id);
fprintf(stdout, "Bitstream HEX = %02x %02x %02x %02x %02x %02x\n",bb[1][0],bb[1][1],bb[1][2],bb[1][3],bb[1][4],bb[1][5]);
fprintf(stdout, "Humidity HEX = %02x\n", bb[1][3]);
fprintf(stdout, "Humidity DEC = %u\n", humidity);
fprintf(stdout, "Button = %d\n", button);
fprintf(stdout, "Battery Low = %d\n", battery_low);
fprintf(stdout, "Channel HEX = %02x\n", bb[1][1]);
fprintf(stdout, "Channel = %u\n", channel);
fprintf(stdout, "temp_with_offset HEX = %02x\n", temperature_with_offset);
fprintf(stdout, "temp_with_offset = %d\n", temperature_with_offset);
fprintf(stdout, "TemperatureF = %.1f\n", temperature_f);
}

data = data_make("time", "", DATA_STRING, time_str,
"model", "", DATA_STRING, "S3318P Temperature & Humidity Sensor",
"id", "House Code", DATA_INT, sensor_id,
"channel", "Channel", DATA_INT, channel,
"battery", "Battery", DATA_STRING, battery_low ? "LOW" : "OK",
"button", "Button", DATA_INT, button,
"temperature_F", "Temperature", DATA_FORMAT, "%.02f F", DATA_DOUBLE, temperature_f,
"humidity", "Humidity", DATA_FORMAT, "%u %%", DATA_INT, humidity,
NULL);

data_acquired_handler(data);

return 0;
}

static char *output_fields[] = {
"time",
"model",
"id",
"channel",
"battery",
"button",
"temperature_C",
"humidity",
NULL
};


r_device s3318p = {
.name = "S3318P Temperature & Humidity Sensor",
.modulation = OOK_PULSE_PPM_RAW,
.short_limit = 2800,
.long_limit = 4400,
.reset_limit = 8000,
.json_callback = &s3318p_callback,
.disabled = 0,
.demod_arg = 0,
.fields = output_fields
};

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