Bit of 433mhz Lora madness for a school predator trap competition (dad got a little carried away)
Hub is a STM32F427 running NETMF 4.4 with a 3.5in Nextion display
Node is a STM32030F4 running C++ which a TPL5100 nano timer so it basically draws no current most of the time. Node reads either a hall effect, microswitch or IR sensor on the traps and sends its state info back to the hub every 1 - 7200 secs depending on VR1 position.
** Edit - just measured current with a uCurrent Gold on the meter - 300nA when sleeping