usersguide:beagleboneweather
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usersguide:beagleboneweather [2014/11/11 14:52] 127.0.0.1 external edit |
usersguide:beagleboneweather [2014/11/12 10:49] (current) lionelsambuc |
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| + | ====== BeagleBone ====== | ||
| + | |||
| + | The [[http://circuitco.com/support/index.php?title=BeagleBone_Weather|BeagleBone Weather]] cape is an expansion board for the [[http://beagleboard.org/Products/BeagleBone|BeagleBone]]. It enhances the BeagleBone's capabilities by providing environment sensors (temperature, humidity, pressure, and ambient light level). | ||
| + | |||
| + | |||
| + | ===== General Overview ===== | ||
| + | |||
| + | ===== weatherstation ===== | ||
| + | |||
| + | Minix comes with a demo application for the Weather Cape called weatherstation. It's a web application. A tiny web server is automatically started at boot time whenever the weather cape is attached. To use the demo, you just need to plug in the cape and have a working network connection; the system will do the rest. | ||
| + | |||
| + | ==== Requirements ==== | ||
| + | |||
| + | **Hardware** | ||
| + | * BeagleBone | ||
| + | * BeagleBone Weather Cape | ||
| + | * Network (doesn't have to be connected to the Internet) | ||
| + | |||
| + | **Software** | ||
| + | * Web Browser with HTML5 support and JavaScript enabled. | ||
| + | |||
| + | |||
| + | ==== Setup ==== | ||
| + | |||
| + | This demo is meant to work 'out of the box'. It requires the BeagleBone be | ||
| + | connected to the network and have the BeagleBone Weather cape attached at | ||
| + | boot. | ||
| + | |||
| + | - Attach the BeagleBone Weather Cape. | ||
| + | - Connect a network cable to the BeagleBone. | ||
| + | - Power on the BeagleBone. | ||
| + | - Configure the network by running these commands. <code> | ||
| + | # netconf | ||
| + | # reboot | ||
| + | </code> | ||
| + | - Enter the BeagleBone's IP address into your web browser. | ||
| + | |||
| + | ==== Usage ==== | ||
| + | |||
| + | |||
| + | This demo is a web application. You just need to point your web browser at | ||
| + | the BeagleBone's IP address to view a nice display of the sensor values. You | ||
| + | can get your BeagleBone's IP address by running ''ifconfig'' on the BeagleBone. | ||
| + | If the address is 192.168.12.138, you'd enter http://192.168.12.138/ into your | ||
| + | web browser. | ||
| + | |||
| + | ===== Accessing Raw Sensor Data ===== | ||
| + | |||
| + | You can access the raw data via the device files. Simply read from the device file corresponding to each sensor to get the values.The labels and values are delimited by a ':' that is located a fixed number of spaces from the start of the line. This should be easy to parse in most programming languages and in shell scripts. Here's some example output: | ||
| + | <code> | ||
| + | # cat /dev/sht21b3s40 | ||
| + | TEMPERATURE : 29.126 | ||
| + | HUMIDITY : 45.818 | ||
| + | # cat /dev/bmp085b3s77 | ||
| + | TEMPERATURE : 28.5 | ||
| + | PRESSURE : 100432 | ||
| + | # cat /dev/tsl2550b3s39 | ||
| + | ILLUMINANCE : 830 | ||
| + | # | ||
| + | </code> | ||
| + | Temperature is measured in [[http://en.wikipedia.org/wiki/Celsius|Celsius]], humidity is [[http://en.wikipedia.org/wiki/Relative_humidity|relative humidity]] expressed as a percentage, pressure is measured in [[http://en.wikipedia.org/wiki/Pascal_%28unit%29|Pascals]], and light is measured in [[http://en.wikipedia.org/wiki/Lux|lux]]. | ||
usersguide/beagleboneweather.txt · Last modified: 2014/11/12 10:49 by lionelsambuc
