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Using the resistance equation for the 8001 LDR, a Raw value can be predicted for the sensor at various light levels and plotted in Figure 5-35. Unlike the NXT Light Sensor, the Raw value decreases with increasing light. The Raw values vary over a range from almost 0 to more than 900. The CdS sensor also varies more at low light level than the NXT, and continues to vary after the NXT sensor hits 100 in bright light. The biggest disadvantage of the CdS sensor over the NXT sensor is that it changes value much more slowly.

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Draws a portion of an ellipse. Draws a B zier spline, which is a curve represented by two endpoints and two free-floating points controlling the angle of the curve. Draws a curved line defined by an array of points. Draws a closed curved line defined by an array of points. continued

function createQueryString() { var firstName = document.getElementById("firstName").value; var middleName = document.getElementById("middleName").value; var birthday = document.getElementById("birthday").value; var queryString = "firstName=" + firstName + "&middleName=" + middleName + "&birthday=" + birthday; return queryString; } function doRequestUsingGET() { createXMLHttpRequest(); var queryString = "GetAndPostExample "; queryString = queryString + createQueryString() + "&timeStamp=" + new Date().getTime(); xmlHttp.onreadystatechange = handleStateChange; xmlHttp.open("GET", queryString, true); xmlHttp.send(null); } function doRequestUsingPOST() { createXMLHttpRequest(); var url = "GetAndPostExample timeStamp=" + new Date().getTime(); var queryString = createQueryString(); xmlHttp.open("POST", url, true); xmlHttp.onreadystatechange = handleStateChange; xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;"); xmlHttp.send(queryString); } function handleStateChange() { if(xmlHttp.readyState == 4) { if(xmlHttp.status == 200) { parseResults(); } } } function parseResults() { var responseDiv = document.getElementById("serverResponse"); if(responseDiv.hasChildNodes()) { responseDiv.removeChild(responseDiv.childNodes[0]); }

The theremin was named after L on Theremin, who invented it in 1919. It was probably the first allelectronic musical instrument, and Figure 5-36 shows L on playing it. It was played by a musician merely waving his hands around the instrument without ever touching it. The distance of the right hand to a vertical antenna controlled the pitch or frequency of the note, while the distance of the left hand to a loop antenna controlled the volume. It produces an eerie monotone that was popular in 1950s science fiction films.

DrawEllipse DrawPie DrawLine DrawLines DrawPolygon DrawRectangle DrawRectangles FillClosedCurve FillEllipse FillPie FillPolygon FillRectangle FillRectangles DrawIcon DrawImage DrawImageUnscaled DrawString MeasureString DrawPath

Draws the outline of an ellipse represented by a rectangle or rectangular set of points Draws a portion of the outline of an ellipse, represented by a rectangle and two radial lines representing the start and finish angles Draws a single line from two points Draws a set of lines from an array of points Draws the outline of a polygon, which is a closed set of lines from an array of points Draws the outline of a rectangle represented by a coordinate and its width and height Draws the outline of a set of rectangles from an array of rectangles Draws a solid closed curve defined by an array of points Draws a solid ellipse represented by a rectangle or rectangular set of points Draws a portion of a solid ellipse, represented by a rectangle and two radial lines representing the start and finish angles.

Figure 5-36. Inventor L on Theremin playing his theremin The original theremin used radio waves to detect the placement of the musician s hands. The NXT theremin uses the amount of light falling on two homebrew Light Sensors. The sensors are mounted on arms extending from the sides of the NXT, as shown in Figure 5-37. While playing, you need to arrange the light so your hands cast shadows onto the sensors. The closer you hold your hand to the sensor, the darker the shadow.

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