---------- Forwarded message ---------- From: Z Ero <zerotetrat...@gmail.com> Date: Sun, Mar 25, 2018 at 3:49 AM Subject: Re: door opening sensor HW for OpenBSD? To: Robert <info...@die-optimisten.net>
For example: https://www.smarthome.com/functional-devices-clc212-10a-closet-light-controller.html On Sun, Mar 25, 2018 at 2:16 AM, Z Ero <zerotetrat...@gmail.com> wrote: > Serial ports are rare on laptops today and just interrupting the power > supply to the laptop does not require any rewiring and can use off the > shelf parts. > > On Sun, Mar 25, 2018 at 2:12 AM, Z Ero <zerotetrat...@gmail.com> wrote: >> Interesting ideas. I had the barometer one too. Is GPS really >> sensitive enough to monitor a door opening and closing? >> >> In terms of practical solutions he can implement without over >> engineering I would say his best solution is to have a switch driving >> a 120 volt relay. When the door opens the switch actuates the relay >> causing it to open and the notebook to transition from AC to battery >> power. This transition in power sources could be monitored by a simple >> shell script which sends an email alert whenever the door opens (and >> AC power is temporarily interrupted). I am pretty sure whisker / >> proximity switches / door open relays are readily available at places >> like Amazon.com >> >> On Sat, Mar 24, 2018 at 4:50 PM, Robert <info...@die-optimisten.net> wrote: >>> On Sat, 24 Mar 2018 22:32:02 +0100 >>> "Hess THR" <hessnovth...@mail.com> wrote: >>>> Can you please recommend any hardware, that I could plug in to the >>>> notebook and though I could send a warning mail when the door was moved >>>> (open/closed). >>> >>> I can think of so many ways to do this, from boring to insane :) >>> >>> * Mount a switch on top of the door that gets unpressed when the door >>> opens, and connect to the serial port. Then read the pin status. >>> * The same, but mount the switch behind the door so that it gets >>> pressed when the door opens. >>> * Use a magnetic switch instead, and read it through the serial port. >>> * Put a keyboard behind the door, so that the door presses against a >>> key when it opens. Map the key to a script. >>> * Attach a mouse to the door and react on the mouse movement. >>> * Attach a GPS sensor to the door and measure movements. >>> * Attach a USB barometer and detect the air pressure diff when the door >>> opens. >>> * Attach a USB gyroscope to the door. Detect movement. >>> * Attach a USB light sensor (Arduino?) and detect movement. >>> * Put an RFID tag on the door, and attach an RFID reader, to detect >>> when the tag approaches the reader. >>> * Attach the laptop to the door and use the built-in gyroscope (if >>> available). >>> * Same, but use the gyroscope from the HD. Might require firmware >>> hacking. >>> * Don't oil the door and evaluate the microphone input. >>> * Attach any USB device, but route the 5V line through a switch >>> attached to the door. Detect when the device attaches. >>> * Mount the laptop behind the door so that the door opens/closes the >>> laptop lid. Detect wake/sleep state. >>> * Fix your credit card to the door and have it move through a card >>> reader when the door opens. Check account balance through script. >>> >>> Send pix! >>> >>> regards, >>> Robert >>>
