usersguide:beagleboneweather [Wiki]

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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]].
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