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about.html
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<html>
<head>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-36561164-2"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-36561164-2');
</script>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Weather Station | About</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet">
<style>
h3 {
/* text-transform:uppercase; */
font-weight:bold;
}
</style>
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="/" class="navbar-brand">Home Weather Station</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li><a href="/">Weather</a></li>
<li class="active"><a href="#">About <span class="sr-only">(current)</span></a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<div class="container">
<div class="page-header">
<h1>About</h1>
</div>
<h3>
What is it?
</h3>
<p>
This is a DIY project to measure and display temperature and windspeed. The weather station – pictured below – is mounted behind windmill blades. A homemade sensor unit records and shares data, which is accessable via web browser.
</p>
<div class="row">
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-arduino-home-weather-station-2018-4.jpg" class="img-thumbnail" alt="image">
<em>
The sensors are housed in a wooden box about 10 x 10 cm.
</em>
</div>
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-arduino-home-weather-station-2018-5b.jpg" class="img-thumbnail" alt="image">
<em>
The box attaches with velcro behind the windmill blades.
</em>
</div>
</div>
<h3>
How does it work?
</h3>
<p>
<b>Inside the Weather Station</b>
<br>
- A microcontroler (<a href="https://learn.adafruit.com/adafruit-feather-huzzah-esp8266" target="_blank">Adafruit Feather Huzzah</a>)
<br>
- A temperature sensor (<a href="https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-sensor-guide/overview" target="_blank">Adafruit MCP9808</a>)
<br>
- An ultrasonic sensor (<a href="http://www.microcenter.com/product/476331/HC-SR05_Ultrasonic_Sensor" target="_blank">HC-SR0</a>)
<br>
- A power jack
<br>
<div class="row">
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-arduino-home-weather-station-2018-1.jpg" class="img-thumbnail" alt="image">
<em>
The electronics are held in place because the ultrasonic sensor fits tightly into the two cut holes. (A smaller, better fitting container could also be used.)
</em>
</div>
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-arduino-home-weather-station-2018-2.jpg" class="img-thumbnail" alt="image">
<em>
The Arduino board takes 3-6V to run.
</em>
</div>
</div>
<br>
<b>Power</b>
<br>
Electricity is supplied through a 3.7v battery charged by a solar panel.
<br>
<br>
<b>Calculating the Windspeed</b>
<br>The windspeed is calculated using the ultrasonic sensor.
<br>
<br>
<div class="row">
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-ultrasonic-sensor-response.jpg" class="img-thumbnail" alt="image">
</div>
<div class="col-sm-6">
<img src="/img/about/mcmillanthomas-ultrasonic-sensor-no-response.jpg" class="img-thumbnail" alt="image">
</div>
</div>
<br>
<p>
The ultrasonic sensor sends a signal every 2 milliseconds. If a windmill blade is in front of the sensor, the sensor receives and records a response. By adding how many responses the sensor receives per 300 signals sent, the windspeed can be calculated.
<br>
<br>
<em style="text-align: center;display: block;font-size: 2em;">
windspeed = (number of blade passes) x (conversion constant)
</em>
<br>
<br>
To enable calculating even slow windspeeds – where a blade might be in front of the sensor for more than 2 milliseconds – a new response is recorded only if the previous signal did not return a response.
</p>
<br>
<b>Data Transmition</b>
<br>
The weather station connects to a local wifi network and transmits the windspeed, temperature and a timestamp to a MySQL database.
<br>
<br>
<b>Website</b>
<br>On the website, the windmill image's blades spin faster or slower based on the actual windspeed. Every 34 seconds the website updates with new data from the database.
<br>
<br>
<b>Code</b>
<br>
The weather station code runs on an Arduino microcontroler, and the website was built using <a href="https://getbootstrap.com/" target="_blank">Bootstrap</a>.
<br>
<br>
<a href="https://github.com/McMillanThomas/Home-Weather-Station" target="_blank"><button class="btn btn-primary">View Project Code on GitHub</button></a>
<br>
<br>
<h3>
Contact
</h3>
thomas [at] mcmillanthomas [dot] com
<br>
<br>
Design portfolio at <a href="http://mcmillanthomas.com" target="_blank">mcmillanthomas.com</a>
</p>
<br>
<br>
</div>
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</body>
</html>