Reader Christian brought this to my attention.. (http://www.simpleiothings.com/10-diy-wifi-smoke-alarm-notifier-roost-nest-alternative-full-tutorial/) The guy uses a NodeMCU, a USB wall power supply and audio sensor (microphone) to catch the audible alarm and start a WiFi alert via IFTTT. The smoke alarm unit stays unaltered and you never have to think about running out of…
