--- /dev/null
+/* LaCrosse TX Temperature and Humidity Sensors
+ * Tested: TX-7U and TX-6U (Temperature only)
+ *
+ * Not Tested but should work: TX-3, TX-4
+ *
+ * Protocol Documentation: http://www.f6fbb.org/domo/sensors/tx3_th.php
+ *
+ * Message is 44 bits, 11 x 4 bit nybbles:
+ *
+ * [00] [cnt = 10] [type] [addr] [addr + parity] [v1] [v2] [v3] [iv1] [iv2] [check]
+ *
+ * Notes:
+ * - Zero Pulses are longer (1,400 uS High, 1,000 uS Low) = 2,400 uS
+ * - One Pulses are shorter ( 550 uS High, 1,000 uS Low) = 1,600 uS
+ * - Sensor id changes when the battery is changed
+ * - Values are BCD with one decimal place: vvv = 12.3
+ * - Value is repeated integer only iv = 12
+ * - Temperature is in Celsius with 50.0 added (to handle negative values)
+ * - There is a 4 bit checksum and a parity bit covering the three digit value
+ * - Parity check for TX-3 and TX-4 might be different.
+ * - Msg sent with one repeat after 30 mS
+ * - Temperature and humidity are sent as separate messages
+ * - Frequency for each sensor may be could be off by as much as 50-75 khz
+ */
+
+#include "rtl_433.h"
+
+// buffer to hold localized timestamp YYYY-MM-DD HH:MM:SS
+#define LOCAL_TIME_BUFLEN 32
+
+void local_time_str(time_t time_secs, char *buf) {
+ time_t etime;
+ struct tm *tm_info;
+
+ if (time_secs == 0) {
+ time(&etime);
+ } else {
+ etime = time_secs;
+ }
+
+ tm_info = localtime(&etime);
+
+ strftime(buf, LOCAL_TIME_BUFLEN, "%Y-%m-%d %H:%M:%S", tm_info);
+}
+
+// Check for a valid LaCrosse Packet
+//
+// written for the version of pwm_p_decode() (OOK_PWM_P)
+// pulse width detector with two anomalys:
+// 1. bits are inverted
+// 2. The first bit is discarded as a start bit
+//
+// If a fixed pulse width decoder is used this
+// routine will need to be changed.
+static int lacrossetx_detect(uint8_t *pRow, uint8_t *msg_nybbles) {
+ int i;
+ uint8_t rbyte_no, rbit_no, mnybble_no, mbit_no;
+ uint8_t bit, checksum, parity_bit, parity = 0;
+
+ // Actual Packet should start with 0x0A and be 6 bytes
+ // actual message is 44 bit, 11 x 4 bit nybbles.
+ if ((pRow[0] & 0xFE) == 0x14 && pRow[6] == 0 && pRow[7] == 0) {
+
+ for (i = 0; i < 11; i++) {
+ msg_nybbles[i] = 0;
+ }
+
+ // Move nybbles into a byte array
+ // shifted by one to compensate for loss of first bit.
+ for (i = 0; i < 43; i++) {
+ rbyte_no = i / 8;
+ rbit_no = 7 - (i % 8);
+ mnybble_no = (i + 1) / 4;
+ mbit_no = 3 - ((i + 1) % 4);
+ bit = (pRow[rbyte_no] & (1 << rbit_no)) ? 1 : 0;
+ msg_nybbles[mnybble_no] |= (bit << mbit_no);
+
+ // Check parity on three bytes of data value
+ // TX3U might calculate parity on all data including
+ // sensor id and redundant integer data
+ if (mnybble_no > 4 && mnybble_no < 8) {
+ parity += bit;
+ }
+
+ // fprintf(stderr, "recv: [%d/%d] %d -> msg [%d/%d] %02x, Parity: %d %s\n", rbyte_no, rbit_no,
+ // bit, mnybble_no, mbit_no, msg_nybbles[mnybble_no], parity,
+ // ( mbit_no == 0 ) ? "\n" : "" );
+ }
+
+ parity_bit = msg_nybbles[4] & 0x01;
+ parity += parity_bit;
+
+ // Validate Checksum (4 bits in last nybble)
+ checksum = 0;
+ for (i = 0; i < 10; i++) {
+ checksum = (checksum + msg_nybbles[i]) & 0x0F;
+ }
+
+ // fprintf(stderr,"Parity: %d, parity bit %d, Good %d\n", parity, parity_bit, parity % 2);
+
+ if (checksum == msg_nybbles[10] && (parity % 2 == 0)) {
+ return 1;
+ } else {
+ fprintf(stderr,
+ "LaCrosse Checksum/Parity error: %d != %d, Parity %d\n",
+ checksum, msg_nybbles[10], parity);
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+// LaCrosse TX-6u, TX-7u, Temperature and Humidity Sensors
+// Temperature and Humidity are sent in different messages bursts.
+static int lacrossetx_callback(uint8_t bb[BITBUF_ROWS][BITBUF_COLS],
+ int16_t bits_per_row[BITBUF_ROWS]) {
+
+ int i, m, valid = 0;
+ uint8_t *buf;
+ uint8_t msg_nybbles[11];
+ uint8_t sensor_id, msg_type, msg_len, msg_parity, msg_checksum;
+ int msg_value_int;
+ float msg_value = 0, temp_c = 0, temp_f = 0;
+ time_t time_now;
+ char time_str[25];
+
+ static float last_msg_value = 0.0;
+ static uint8_t last_sensor_id = 0;
+ static uint8_t last_msg_type = 0;
+ static time_t last_msg_time = 0;
+
+ for (m = 0; m < BITBUF_ROWS; m++) {
+ valid = 0;
+ if (lacrossetx_detect(bb[m], msg_nybbles)) {
+
+ msg_len = msg_nybbles[1];
+ msg_type = msg_nybbles[2];
+ sensor_id = (msg_nybbles[3] << 3) + (msg_nybbles[4] >> 1);
+ msg_parity = msg_nybbles[4] & 0x01;
+ msg_value = msg_nybbles[5] * 10 + msg_nybbles[6]
+ + msg_nybbles[7] / 10.0;
+ msg_value_int = msg_nybbles[8] * 10 + msg_nybbles[9];
+ msg_checksum = msg_nybbles[10];
+
+ time(&time_now);
+
+ // suppress duplicates
+ if (sensor_id == last_sensor_id && msg_type == last_msg_type
+ && last_msg_value == msg_value
+ && time_now - last_msg_time < 50) {
+ continue;
+ }
+
+ local_time_str(time_now, time_str);
+
+ switch (msg_type) {
+ case 0x00:
+ temp_c = msg_value - 50.0;
+ temp_f = temp_c * 1.8 + 32;
+ printf("SENSOR:TYPE=LACROSSE_TX,TIME=%s,ID=%02x,TEMPERATURE=%3.1f\n",
+ time_str, sensor_id, temp_c);
+ break;
+
+ case 0x0E:
+ printf("SENSOR:TYPE=LACROSSE_TX,TIME=%s,ID=%02x,HUMIDITY=%3.1f\n",
+ time_str, sensor_id, msg_value);
+ break;
+
+ default:
+ fprintf(stderr,
+ "%s LaCrosse Sensor %02x: Unknown Reading % 3.1f (%d)\n",
+ time_str, sensor_id, msg_value, msg_value_int);
+ }
+
+ time(&last_msg_time);
+ last_msg_value = msg_value;
+ last_msg_type = msg_type;
+ last_sensor_id = sensor_id;
+
+ } else {
+ return 0;
+ }
+ }
+
+ if (debug_output)
+ debug_callback(bb, bits_per_row);
+ return 1;
+}
+
+r_device lacrossetx = {
+/* .id = */15,
+/* .name = */"LaCrosse TX Temperature / Humidity Sensor",
+/* .modulation = */OOK_PWM_P,
+/* .short_limit = */238,
+/* .long_limit = */750,
+/* .reset_limit = */8000,
+/* .json_callback = */&lacrossetx_callback, };
projects / rtl-433.git / blobdiff