// Acurite 609 Temperature and Humidity Sensor
// 5 byte messages
// II ST TT HH CC
// II - ID byte, changes at each power up
// S - Status bitmask, normally 0x2,
// 0xa - battery low (bit 0x80)
// TTT - Temp in Celsius * 10, 12 bit with complement.
// HH - Humidity
// CC - Checksum
//
// @todo - see if the 3rd nybble is battery/status
//
static int acurite_th_callback(bitbuffer_t *bitbuf) {
uint8_t *bb = NULL;
int cksum, battery_low, valid = 0;
float tempc;
uint8_t humidity, id, status;
data_t *data;
local_time_str(0, time_str);
for (uint16_t brow = 0; brow < bitbuf->num_rows; ++brow) {
if (bitbuf->bits_per_row[brow] != 40) {
continue;
}
bb = bitbuf->bb[brow];
cksum = (bb[0] + bb[1] + bb[2] + bb[3]);
if (cksum == 0 || ((cksum & 0xff) != bb[4])) {
continue;
}
tempc = acurite_th_temperature(bb);
id = bb[0];
status = (bb[1] & 0xf0) >> 4;
battery_low = status & 0x8;
humidity = bb[3];
data = data_make(
"time", "", DATA_STRING, time_str,
"model", "", DATA_STRING, "Acurite 609TXC Sensor",
"id", "", DATA_INT, id,
"battery", "", DATA_STRING, battery_low ? "LOW" : "OK",
"status", "", DATA_INT, status,
"temperature_C", "Temperature", DATA_FORMAT, "%.1f C", DATA_DOUBLE, tempc,
"humidity", "Humidity", DATA_INT, humidity,
NULL);
data_acquired_handler(data);
valid++;
}
if (valid)
return 1;
return 0;
}
// @tdodo - determine which Acurite temp/humidity
// sensors this acutally decodes
static int acurite_th_callback(bitbuffer_t *bitbuffer) {
bitrow_t *bb = bitbuffer->bb;
uint8_t *buf = NULL;
int i;
for(i = 0; i < BITBUF_ROWS; i++){
if(acurite_th_detect(bb[i])){
buf = bb[i];
break;
}
}
if(buf){
fprintf(stdout, "Temperature event:\n");
fprintf(stdout, "protocol = Acurite Temp&Humidity\n");
fprintf(stdout, "temp = %.1f°C\n", acurite_th_temperature(buf));
fprintf(stdout, "humidity = %d%%\n\n", buf[3]);
return 1;
}
return 0;
}
