68 lines
2.6 KiB
Plaintext
68 lines
2.6 KiB
Plaintext
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<!-- { "title": "Something really useful: 433MHz Power-Outlet Control" } -->
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<h1>#title#</h1>
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<p>
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We've lots of more or less cheap 433MHz Switchable Power-Outlets in the house, mostly for decorative lights. You get them for under 15€ in the Building Center, three at once with a remote control. Usually, you can control four switches with one remote, period. (A promising exceptions are the device from Intertechno.)
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</p>
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<p>
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Now I was looking for a way to
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<ol>
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<li>Control the switches from different manufacturers with one remote.</li>
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<li>Control them from really remote - from the office or from holiday.</li>
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<li>Control them programmatically.</li>
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</ol>
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There are a couple of Arduino libraries out there which are working with this cheap 433MHz senders and receivers from China:
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<img src="files/sender_receiver.png" alt="sender_receiver" width="406" height="386" /><br/>
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I tried several ones, not all a really working, but finally I stopped at <a href="https://github.com/sui77/rc-switch" target="_blank">https://github.com/sui77/rc-switch</a>, which works really good.
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</p>
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<p>
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First challenge now is to get the codes out of the remotes. For this purposes the rc-switch library provides an example sketch for the Arduino. I extended it a bit and got this:
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</p>
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<p>
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<a href="files/img_01012-e1478087121580.jpg"><img src="files/img_01012-e1478087121580.jpg?w=730" alt="img_0101" width="730" height="548" /></a><
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</p>
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<p>
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<a href="files/img_0105.jpg"><img src="files/img_0105.jpg?w=730" alt="img_0105" width="730" height="548"/></a>
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</p>
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<p>
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Software for this thing can be found here <a href="https://gitlab.com/wolutator/433Receiver.git" target="_blank">https://gitlab.com/wolutator/433Receiver.git</a>.
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</p>
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<p>
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This is how it works:
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</p>
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<p>
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<a href="files/img_0111-e1478087101747.jpg"><img src="files/img_0111-e1478087101747.jpg?w=730" alt="img_0111" width="730" height="548"/></a>
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</p>
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<p>
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The second challenge is to send the codes out into air and let the power switches receive them. This is done with this thing:
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</p>
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<p>
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<a href="files/img_0100-e1478087375824.jpg"><img src="files/img_0100-e1478087375824.jpg?w=730" alt="img_0100" width="730" height="548" /></a>
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</p>
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<p>
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It is a Arduino Ethernet Board with a PoE-adapter and the 433MHz sender directly attached to it. I glued it under a table in the living room.
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</p>
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<p>
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This thing received messages via MQTT and send them out via 433MHz.
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</p>
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<p>
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The software is <a href="https://gitlab.com/wolutator/Mqtt433Gateway.git" target="_blank">here at Gitlab</a>.
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</p>
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<p>
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BTW: do not expect beautiful software, this has been made on Halloween evening and night when waiting for the kids to come home.
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</p>
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