Dragino LHT65 is a $30 LoRaWAN Temperature & Humidity Sensor

If you’d like to monitor temperature and/or humidity in remote locations, one way is to get a LoRaWAN gateway, and setup a few LoRaWAN nodes connected to your own temperature & humidity sensors, and add a battery and enclosure.

But if you’d like to save some time, and get a turnkey solution, Dragino LHT65 LoRaWAN temperature & humidity sensor may be an option. The sensor comes with an internal SHT20 sensor, and as well as an external DS18B20 waterproof temperature sensor.

Features & specifications:

• LoRa Connectivity
  • Frequency Bands  – CN470, EU433, KR920, US915, EU868, AS923, AU915
  • LoRaWAN Class A protocol
• Sensors
  • Sensirion SHT20 (internal)
    • Temperature – Range: -40 ~ 125 °C; 0.1°C resoultion; +/-0.3°C accuracy; long term drift < 0.02 °C/yr
    • Relative Humidity – Range: 0 to 100%; resolution: 0.04%; accuracy +/-0.3%;
  • DS18B20 (external) – Range: -55 °C~ 125 °C; resolution: 0.0625 °C; +/-0.5°C accuracy from -10°C to +85°C; +/-2°C accuracy  outside this range
• Data Storage – Up to 3200 data records with datetime
• Misc – Tri-color status LED, ACT button to change modes (test, activate, deactivate)
• Battery – 2,400 mAh battery good for more than 10 years on a charge (depending on usage)
• Power Consumption
  • Without external sensor – Idle: 3uA. Transmit: max 130mA
  • With external sensor – Idle: 4uA, Transmit: max 130mA
• Dimensions – 135 x 70 x 30 mm
• Weight – 105 grams

The sensor can be configured using AT commands via the provided serial cable, and remotely over the LoRaWAN network.

LHT65 also support firmware upgrade over the serial cable, but apparently not over-the-air.

The sensor is configured as LoRaWAN OTAA Class A mode by default, and each unit is shipped with a worldwide unique set of OTAA and ABP keys which should can use to connect to any LoRaWAN network. The default period for each uplink is 10 minutes.  You can find more details in the download page of Dragino website including the firmware, a user manual showing how to connect the sensor to The Things Network, and a document detailing the AT commands set.

Dragino LHT65 LoRaWAN temperature sensor can be purchased on Aliexpress for $30 plus shipping. The package will also include DS18B20 temperature sensor and a program cable. Make sure you select the right frequency band at the time of order. I can see EU868 band is out of stock on Aliexpress, but there are a few EU resellers with this model including Antratek.

Thanks to Stanislav for the tip.

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