I built one of these a couple of months ago using a rPI and a simple relay to control the 12v feed to one of these:<p><pre><code>    http:&#x2F;&#x2F;www.super-feeder.com&#x2F;csfmodel.html
</code></pre>
Literally the code to feed them is a crontab:<p><pre><code>    0 5,11,17 * * * &#x2F;home&#x2F;pi&#x2F;bin&#x2F;feed - &gt; &#x2F;dev&#x2F;null 2&gt;&amp;1
</code></pre>
Using this script in &#x2F;home&#x2F;pi&#x2F;bin&#x2F;feed:<p><pre><code>    #!&#x2F;bin&#x2F;bash

    export PATH=$HOME&#x2F;bin:$PATH

    (
        source gpio
        echo &quot;Using pin 12&quot;
        gpio mode 12 out
        gpio mode 12 out
        gpio write 12 0
        sleep 1
        echo &quot;Turn On&quot;
        gpio write 12 1
        sleep 20
        echo &quot;Turn Off&quot;
        gpio write 12 0
    ) 2&gt;&amp;1 | logger -p local0.info -s -t feed

    gpio write 12 0

    exit 0

    &#x2F;home&#x2F;pi&#x2F;bin&#x2F;gpio is from here: https:&#x2F;&#x2F;github.com&#x2F;lasandell&#x2F;RaspberryPi.git
</code></pre>
I re-wrote it this weekend as a Openresty powered API (nginx+luajit) and put a web page on with a feed from the picam so my wife could look at the bowl and hit a button to dispense more if the cats needed it.