co2 co2 각인쪽(바깥쪽)이 gpio3 시리얼 rx , 안쪽이 gpio1 시리얼 tx이다. on System#Boot do   timerSet,1,10   oledcmd,off endon On Rules#Timer=1 do   timerSet, 2, 10   oledcmd,on endon On Rules#Timer=2 do   timerSet,1,120   oledcmd,off endon https://www.reddit.com/r/SmartThings/comments/6uxj1a/has_anyone_reverse_engineered_some_of_the_cheap/ https://github.com/codetheweb/tuyapi https://blog.ipsumdomus.com/sonoff-switch-complete-hack-without-firmware-upgrade-1b2d6632c01 http://support.iteadstudio.com/support/discussions/topics/11000010107/page/2?url_locale= https://github.com/mdopp/simple-sonoff-server https://github.com/mirko/SonOTA