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License: BSD 2-Clause "Simplified" License
Automatically exported from code.google.com/p/alm335.alm335i
License: BSD 2-Clause "Simplified" License
aLM335i Copyright 2011 Kes Calhoun 1. Description aLM335i is a library for controlling the common LM335 sensor. This sensor is used, in among other places, the Arduino explorer kit. It's one of the first "complicated" sensors an Arduino user tends to poke at, and has a few pitfalls in its use. This library handles most of the difficult tasks faced by someone wishing to use this component, and includes several helpful functions. This library is the pure integer version, for use in constrained memory situations. 2. Usage This library will handle setting up the microcontroller, polling the ADC, converting data from the ADC to the desired units, and managing the reference voltages. 2.1 Initialization This library is initialized much like any other C library: aLM335i variable [(any, optional, parameters)]; Because most of the time, people don't care about large customizations, the library will handle most of the common cases for you. If you just want to use the library with the bare defaults of activating on pin zero, with a five volt internal reference, you instantiate it as follows: aLM335i variable; Instantiating it with using another pin is done as follows: aLM335i variable(int pin); For example, for a sensor reading from pin 0: aLM335i sensor(0); With using other than a 5 volt reference voltage, you have to multiply your reference voltage by ten: aLM335i variable(int pin, int refVoltage); For example, on a pin reading from pin 0, with a 3.3 volt reference voltage: aLM335i sensor(0, 33); And, if you also want to switch to using an external reference voltage: aLM335i variable(int pin, int refVoltage, bool use_ext_ref); For example, for readon on pin 3, with a 4 volt external reference voltage: aLM335i complicatedsensor( 3, 40, TRUE); 2.2 Getting values: There are four functions included in the library for handling values: getRaw(); getKelvin(); getCelsius(); getFahrenheit(); getRaw returns an integer with the raw value from the ADC, no conversion done, just a straight integer. getKelvin() will return a float with the temperature in Kelvin, getCelsius() will do the same with a Celsius value, and getFahrenheit() will do the same with a Fahrenheit value. 3. Licensing This library is available under the BSD license. This allows you to use the code in pretty much whatever way you want, as long as you abide by the rules it sets out: Copyright (c) 2011 Kes Calhoun All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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