looks like a great option for Raspberrypi Zero and esp8266 or pic nanoWatt series , stm32L series.
copper is poisonous
might be ideal to place these underground or with something to capture moisture
paiting the outsides of them
also found this
looks like a great option for Raspberrypi Zero and esp8266 or pic nanoWatt series , stm32L series.
copper is poisonous
might be ideal to place these underground or with something to capture moisture
paiting the outsides of them
also found this