This one takes readings from a remote sensor in the back yard. It was built for a friend who has a pool, so naturally it has a pool temperature sensor as well!
The sensor has a thermistor which dips into the pool. The sensor transmits using LoRa RF technology at 915MHz. It runs off a battery which should last about 20 years.
On the back there are buttons to switch the temperature readings from Celsius to Fahrenheit, and a little cage for the indoor sensor.
Inside, the analog gauges are run from miniature stepper motors. The main processor is an ESP32. A 240x320 TFT LCD hosts the digital readings.
The LoRa radio receiver uses an RFM95 module and an ATmega328 processor.
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