LoRa Temperature and Humidity Data Logger

A wireless temperature and humidity logger that removes the need for cabling across large or hard-to-wire sites. Spread spectrum LoRa radio with frequency hopping delivers more than 3,000 m line-of-sight range outdoors and passes through three to four reinforced concrete walls indoors, while resisting electromagnetic interference. The logger can be wall-mounted or fixed to the outside of a refrigerator, is configured over Bluetooth, and runs on its built-in battery for about 8 months at a 120-second upload interval, or from an external 5 V supply. A built-in buzzer provides local alarms.