I design the block diagram of a prototype I want to build.
The system is going to be battery operated and I am looking for low energy solutions
There are 5 x reed switches (RS1…RS5) triggered from a magnet (one magnet for every single reed switch).
The initial state of the reed switch is LOW and the MCU is in deep sleep mode.
When any of the reed switches change state (from LOW->HIGH) the MCU wakes up (through external interrupt) and starts reading the state of the reed switches through the Multiplexer.
It is possible more than one reed switches be HIGH at the same time (basically it could be 2^5 combinations)
In case that all the reed switches return to LOW state, the MCU will jump into a deep sleep state for energy saving.
Do you have any recommendations about this topology? Or any suggestions for improvement?