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Add support for additional Arexx sensors #3076

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Nov 5, 2024
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Add support for additional Arexx sensors #3076

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43 changes: 32 additions & 11 deletions src/devices/arexx_ml.c
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Original file line number Diff line number Diff line change
Expand Up @@ -103,26 +103,47 @@ static int arexx_ml_decode(r_device *decoder, bitbuffer_t *bitbuffer)
// Extract data from buffer
int id = (b[2] << 8) | (b[1]); // little-endian
int sens_val = (b[3] << 8) | (b[4]); // big-endian?
int is_humi = id & 1; // even number: Temperature, odd number: Humidity

// MCP9808 Ambient Temperature Register "5-4":
int temp_alert = (sens_val >> 13) & 7;
int temp_raw = (int16_t)(sens_val << 3); // uses sign-extend
float temp_c = temp_raw / 128;

if (msg_len == 5) { // not sure if this is the proper check
// Decode readings
float temp_c = 0.0;
float humidity = 0.0;
int is_humi = 0;
int is_temp = 0;
int is_alert = 0;
int temp_alert = 0;

if (msg_len == 5 && (id & 0xF000) == 0x2000) {
// temperature reading from TL-3TSN, TSN-33MN, etc.
is_temp = 1;
temp_c = (int16_t)sens_val * 0.0078125f;
}
else if (msg_len == 5 && (id & 0xF001) == 0x4000) {
// temperature reading from TSN-TH70E, IP-TH70EXT, etc.
is_temp = 1;
// SHT10 Temperature
temp_c = sens_val * 0.01f - 40.0f; // offset actually varies by Vdd
}
// SHT10 Humidity
float humidity = -2.0468 + 0.0367 * sens_val - 1.5955E-6 * sens_val * sens_val;
else if (msg_len == 5 && (id & 0xF001) == 0x4001) {
// humidity reading from TSN-TH70E, IP-TH70EXT, etc.
is_humi = 1;
sens_val = (int16_t)sens_val;
// SHT10 Humidity
humidity = -2.0468 + 0.0367 * sens_val - 1.5955E-6 * sens_val * sens_val;
}
else if (msg_len == 6) {
is_temp = is_alert = 1;
// MCP9808 Ambient Temperature Register "5-4":
temp_alert = (sens_val >> 13) & 7;
int temp_raw = (int16_t)(sens_val << 3); // uses sign-extend
temp_c = temp_raw / 128;
}

/* clang-format off */
data_t *data = data_make(
"model", "", DATA_STRING, "Arexx-ML",
"id", "ID", DATA_FORMAT, "%04x", DATA_INT, id,
"temperature_C", "Temperature", DATA_COND, !is_humi, DATA_FORMAT, "%.2f C", DATA_DOUBLE, temp_c,
"temperature_alert", "Alert", DATA_COND, !is_humi, DATA_FORMAT, "%x", DATA_INT, temp_alert,
"temperature_C", "Temperature", DATA_COND, is_temp, DATA_FORMAT, "%.2f C", DATA_DOUBLE, temp_c,
"temperature_alert","Alert", DATA_COND, is_alert, DATA_FORMAT, "%x", DATA_INT, temp_alert,
"humidity", "Humidity", DATA_COND, is_humi, DATA_FORMAT, "%.1f %%", DATA_DOUBLE, humidity,
"sensor_raw", "Sensor Raw", DATA_FORMAT, "%04x", DATA_INT, sens_val,
"mic", "Integrity", DATA_STRING, "CRC",
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