LoRaWAN water level sensor
I’ve been thinking about doing something similar to this water level monitoring sensor, but with temperature, at a location that’s just a little too far for Wi-Fi. There are some good ideas here. For e.g. I didn’t know that the TPL5110 timer existed.
The components are all on Arduino shields to reduce as much cables as possible. There is a Buck/Boost-converter which is connected to either a 9v battery or 4 1.5V batteries. To improve the life span of those batteries, a TPL5110 board with a timer activates the Arduino about every 1 and a half hour.