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The code for this project is short and simple. You start off by defining the sensor pin. In this case, you are using Analog Pin 0. #define sensorPin 0 You then need some variables to store the temperatures in Celsius, Fahrenheit, and Kelvin. As you want accuracy, you use variables of type float. float Celsius, Fahrenheit, Kelvin; Then you create an integer to hold the value read from the analog pin: int sensorValue; The setup loop begins serial communication at a baud rate of 9600: Serial.begin(9600); Then you display Initialising .. to show the program is about to start: Serial.println("Initialising....."); In the main program loop, you call the GetTemp() function that reads the temperature from the sensor and converts it to Celsius and Fahrenheit. Then it prints out the temperatures in the serial monitor window. GetTemp(); Serial.print("Celsius: "); Serial.println(Celsius); Serial.print("Fahrenheit: "); Serial.println(Fahrenheit); Serial.println(); Now you create the GetTemp() function: void GetTemp() First, the sensor is read and the value stored in sensorValue: sensorValue = analogRead(sensorPin); // read the sensor The output from the sensor is in Kelvin, with every 10mV being one K. Kelvin starts at zero degrees K when the temperature is at absolute zero, or the lowest possible temperature in the universe. So at absolute zero, the sensor will be outputting 0 volts. According to the datasheet, the sensor can be calibrated by checking that the voltage from the sensor is 2.98 volts at 25 C. To convert from Kelvin to Celsius, you simply subtract 273.15 from the Kelvin temperature to get the Celsius temperature. So 25 C in Kelvin is 298.15 and if every degree is 10mV, then you simply move the decimal point two places to the left to get the voltage at that temperature, which is indeed 2.98 volts.

1. Create a Struts directory in a convenient location on your hard drive. 2. Copy the lab4.zip file on the CD-ROM into this Struts directory. 3. Unzip the contents, making sure you ve preserved the directory structure. 4. You should see a subdirectory called .\Struts\lab4\. 5. Open .\Struts\lab4\compile.bat in a text editor and amend the PATH environment

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Steve brings historical and big-picture perspectives to technical and operational issues and leverages business intelligence to expand CA's ability to positively impact our planet and communities. During Steve s 20 year career in the IT industry, prior to joining CA, he held positions in strategy, development and management. Steve was a member of IBM s Software Group Strategy unit and led an effort to determine where Digital Media fit into IBM s overall strategy and helped to define the company s Itanium II positioning. Steve has filed more than 25 patent applications in various emerging technology areas. He participates in CA's Technology Innovation Committee and is a member of CA s Council for Technical Excellence. Steve serves as member of the U.S. Council for Competitiveness on the Energy, Security, Innovation and Sustainability committee. He is also a member of the World Economic Forum s Committee for Information and Communication Technology. Steve attended Northeastern University where he majored in business.

So, to get the temperature in Kelvin, you read the value from the sensor, which will range from 0 to 1023, and then divide it by 1023, and multiply that result by 5. This will effectively map the range from 0 to 5 volts. As each degree K is 10mV, you then multiply that result by 100 to get degrees K. Kelvin = (((float(sensorValue) / 1023) * 5) * 100); // convert to Kelvin The sensor value is an integer so it is cast to a float to ensure the result is a float, too. Now that you have your reading in K, it s easy to convert to Celsius and Fahrenheit. To convert to Celsius, subtract 273.15 from the temperature in K: Celsius = Kelvin - 273.15; // convert to Celsius And to convert to Fahrenheit, multiply the Celsius value by 1.8 and add 32: Fahrenheit = (Celsius * 1.8) +32; // convert to Fahrenheit

2. Put in this taglib declaration: <%@ taglib uri="http://struts.apache.org/shale/

The LM135 range of sensors is nice in that they can be easily calibrated so you can ensure an accurate reading every time. They are also cheap so you can purchase a whole bunch of them and obtain readings from different areas of your house or the internal and external temperatures from a high altitude balloon project. Other analog sensors can be used. You may find that the third pin on some sensors, which is the adj (adjustment) pin in the LM335, is the temperature output pin. Therefore, you should use this third pin to read the temperature instead of the supply voltage pin. Calibrating these types of sensors can be done easily in software. You will next look at a digital temperature sensor. By far the most popular of these types is the DS18B20 from Dallas Semiconductor (Maxim).

If you want client-side validation, you need to add the extra attribute onsubmit='validateForm(this)' and the child tag <s:validatorScript functionName= "validateForm"/> to the <h:form>. The former invokes the JavaScript functions to validate the form, while the latter instructs Shale to paste in the JavaScript validation code. Listing 20-17 shows how we might rewrite logon.jsp (see Listing 20-11) using Shale s Validator framework. As usual, we ve stripped out the <f:verbatim> tags.

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