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    <p>I found what I needed here: <a href="http://www.armhf.com/index.php/using-beaglebone-black-gpios/" rel="nofollow noreferrer">http://www.armhf.com/index.php/using-beaglebone-black-gpios/</a>.</p> <p>I'm running kernel 3.8.13.</p> <p>Based on that, I wrote this script:</p> <pre><code>#!/bin/bash # http://www.armhf.com/index.php/using-beaglebone-black-gpios/ # pin 9:11, gpio0[30] - 0 + 30 = 30 echo 30 &gt; /sys/class/gpio/export echo in &gt; /sys/class/gpio/gpio30/direction cat /sys/class/gpio/gpio30/value # 1=switch open; 0=switch closed while [ 1 ] ; do cat /sys/class/gpio/gpio30/value ; sleep .5 ; done </code></pre> <p>When the pin is held low, the script displays 0, and 1 when high. I breadboarded a circuit based on <a href="http://www.digikey.com/us/en/techzone/microcontroller/resources/articles/protecting-inputs-in-digital-electronics.html" rel="nofollow noreferrer">http://www.digikey.com/us/en/techzone/microcontroller/resources/articles/protecting-inputs-in-digital-electronics.html</a>.</p> <p>The orange wires on the right side of the pic act as a switch.</p> <p>My plan is to then take this and a door switch from a dead printer to make a freezer switch. Then I'll modify the script to email me when the freezer's been open for more than say, 10 minutes.</p> <p><img src="https://i.stack.imgur.com/SpdOu.jpg" alt="enter image description here"></p> <p>Edit:</p> <p>Did some study and found more info on how to set pinmux, specifically with device tree overlays:</p> <p>Okay, watched this, and learned a lot: <a href="http://www.youtube.com/watch?v=wui_wU1AeQc" rel="nofollow noreferrer">http://www.youtube.com/watch?v=wui_wU1AeQc</a></p> <p>Was able to finally get control over pinmux settings on the BBB with the device tree overlay below. The fragment@1 section is still magic to me, so at some point hopefully it'll make more sense. Nevertheless, at least I can detect closed switches on all for pins.</p> <p>One critical piece was the chart in Derek's project here: <a href="https://github.com/derekmolloy/boneDeviceTree/tree/master/docs" rel="nofollow noreferrer">https://github.com/derekmolloy/boneDeviceTree/tree/master/docs</a></p> <pre><code>/dts-v1/; /plugin/; / { compatible = "ti,beaglebone", "ti,beaglebone-black"; part-number = "mousetraps"; version = "00A1"; /* https://github.com/derekmolloy/boneDeviceTree/blob/master/docs/BeagleboneBlackP9HeaderTable.pdf */ fragment@0{ target = &lt;&amp;am33xx_pinmux&gt;; __overlay__ { mousetrap_pins: pinmux_mousetrap_pins { pinctrl-single,pins = &lt; 0x070 0x2f /* P9_11 30 INPUT MODE7 none */ 0x074 0x2f /* P9_13 31 INPUT MODE7 none */ 0x040 0x2f /* P9_15 48 INPUT MODE7 none */ 0x15c 0x2f /* P9_17 05 INPUT MODE7 none */ &gt;; }; }; }; fragment@1{ target = &lt;&amp;ocp&gt;; __overlay__ { test_helper: helper { compatible = "bone-pinmux-helper"; pinctrl-names = "default"; pinctrl-0 = &lt;&amp;mousetrap_pins&gt;; status = "okay"; }; }; }; }; </code></pre>
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