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Posts posted by SByke

  1. The Dallas 1-wire temp sensors are self-contained digital ICs and are designed to work at long distances FYI. They are ideal for temps sub-100C e.g. inside living spaces. Sent from my Galaxy Note II with Tapatalk 4


    Indeed.  Pretty slick.  The 1-wire interface is intended for long runs and you can chain quite a few sensors on the same run.  They even scavenge power from the data line.  Each has a unique 64 bit ID and there's a linux driver for the 1-wire interface.  So once you have the driver running and pointed at the right GPIO pin you can just read cat /sys/whatever to get the temperatures for each sensor.


    So they are pricier, but all in all if they are good fit for this project.

  2. Plan:

    1. Enable turning on attic fan when inside, outside, and attic temperatures indicate it's beneficial

    2. Open Garage door when a crypto signed request is made

    3. Send XMPP/Email and sound buzzer when garage door is open too long.

    4. Leave expansion for future sensors, monitoring, and control.


    Pasts list:

    * Beaglebone Black

    * http://www.amazon.com/gp/product/B0057OC5O8 Relay to control fan, and garage door open/close, and buzzer.

    * QTY 3 https://www.sparkfun.com/products/11050 1-wire temp sensors to monitor attic, inside, and outside temps.  To allow monitoring when best to turn on fan.

    * Wifi, any difference in reception?  Anything better out there?


    * QTY 2: One for door up, one for door down, to help make sure it never gets confused:
    * buzzer (hopefully audible from inside the house).
    * 5V/2000mA UL listed power adapter http://www.adafruit.com/products/276
    * Anything obvious missing?
    * Should everything be compatible/relatively easy to integrate?
    * Any suggestions for where to get a few hundred feet or wire for handling things like the temp
      sensors, magnetic switches, and to replace the existing garage door opening switch?
    * Any better parts than the above?  Especially the buzzer.
    * Any nice project cases with a few audio/rj11/rj45 built in to enable easy pluggable
      connections to 4 to 8 low voltage data lines?
    Comments?  Suggestions?  Links to similar projects?
    Oh I did find this one based on a Rasberry Pi:
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