That was actually the initial plan because of fun factor but I got access to a wharf so that will be easier.Why not get a boat anchor and some balls. Make floats in a string. Have one ball have a solar panel. Make the lowest be the battery holder. Put a temperature sensor in all but the top ball. The water will ensure the batter never overheats or freezes. This should also keep the PICO in a safe range.
Sorry, hopefully wifi coverage is enough and MQTT into homeassistant. If wifi coverage is lacking I might go for Lora. The sleep function will be handled by the timer breakout board, so no fret there I think.A big unknown -- the one major item that is missing from the description -- is how OP wants the temp reading. Lakeside display? E-paper display? Wired data? Wireless? Short range BT? Wifi, say MQTT? GSM MQTT? Free-space laser comms to the house? So many options...
The method to get the reading will have some impact on power. Granted, if the temp is updated once an hour, the data rate is very low, but if Wifi there will be non-trivial power draw and it needs to sleep as well, and something like GSM may draw lots and lots of battery juice.
I realized that I wont be able to read the voltage of the battery as I also will read the charging current.
Statistics: Posted by shazbot — Sun Jul 28, 2024 1:41 pm