http://www.ti.com/lit/ds/symlink/tpl5111.pdf 35nA thing that controls pwr converter and shutdown via gpio. only works with up to 5v though, not nine volt battery. so minimal power conversion still would be necessary.
A project log for hacking a smoke detector
adding an ESP-12 with some flipflop magic and MQTT
http://www.ti.com/lit/ds/symlink/tpl5111.pdf 35nA thing that controls pwr converter and shutdown via gpio. only works with up to 5v though, not nine volt battery. so minimal power conversion still would be necessary.
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Cool littel project. What brand of smoke detector did you use?
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