Steve Hoefer at Grathio labs shows off his Arduino based door opener, which responds to knocks on the door by timing the gaps between the sound bursts.
Deadbolt always thought there was something strange about his brother. But they were never really open with each other. ~NSHA Submitted by: iizluvhappy
Still trying to wrap my head around this one, but I’m thinking the coat hanger/toiler paper roll thing is attached to the locking mechanism, meaning he has to first pull that before swinging the door open.