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for the Hi and Lo constants (As an aside, I couldn t use High and Low as names for these two constants because the compiler reserves those two words for the High and Low commands) In order to understand how the Hi and Lo values were determined, let s consider the three possibilities: the point in the circuit that the probe is touching is either at a digital high level, a digital low level, or open (ie, not connected to any other point in the circuit)

function PIPHP_JS_PostAjaxRequest(url, params, target) { request = new PIPHP_JS_AjaxRequest() requestonreadystatechange = function() { if (thisreadyState == 4) if (thisstatus == 200) if (thisresponseText != null) targetinnerHTML = thisresponseText // You can remove these two alerts after debugging else alert("Ajax error: No data received") else alert( "Ajax error: " + thisstatusText) } requestopen("POST", url, true) requestsetRequestHeader("Content-type", "application/x-www-form-urlencoded") requestsetRequestHeader("Content-length", paramslength) requestsetRequestHeader("Connection", "close") requestsend(params) }

Working with LocationProvider and LocationManager Testing location in the emulator Receiving location alerts with LocationListener Drawing with MapActivity and MapView Looking up addresses with the Geocoder

Accurate location awareness makes a mobile device more powerful. Combining location awareness with network data can change the world and Android shines here. Other platforms have gained similar abilities in recent years, but Android excels with its easy-to-use and popular location API framework based on Google Maps. From direct network queries to triangulation with cell towers and even satellite positioning via GPS, an Android-powered device has access to different types of LocationProvider classes that allow access to location data. Various providers supply a mix of location-related metrics, including latitude and longitude, speed, bearing, and altitude.

11:

divider is 990 , which will lower the ADC reading almost to 0 (My actual ADC reading in this situation was 10) The Hi constant is the dividing line between a high input and an open input, so I defined Hi to be 190, which is approximately halfway between 134 and 254 Similarly, I defined Lo to be 70 because that s roughly halfway between 10 and 134 Download LogicProbebas to your breadboard circuit For test purposes, you can just use an eight- or ten-inch piece of jumper wire for the probe When you (carefully) touch the jumper wire to a high point in the circuit (eg, pin 1 of the 08M2), the red LED should light; when you touch a grounded point (eg, pin 8 of the 08M2), the green LED should light; whenever the jumper is not touching anything (or touching a point on the breadboard that isn t connected to anything in the circuit), neither LED should be lit

Developers generally prefer to work with GPS because of its accuracy and power. But some devices may not have a GPS receiver, and even GPS-enabled devices can t access satellite data when inside a large building or otherwise obstructed from receiving the signal. In those instances the Android platform provides a graceful and automatic fallback to query other providers when your first choice fails. You can examine provider availability and hook into one or another using the LocationManager class. Location awareness1 opens up a new world of possibilities for application development. In this chapter you ll build an application that combines location awareness with data from the U.S. National Oceanic and Atmospheric Administration (NOAA) to produce an interesting and useful mashup. Specifically you ll connect to the National Data Buoy Center (NDBC) to retrieve data from buoys and ships located around the coastline in North America. Thanks to the NOAA-NDBC system, which polls sensors on buoys and makes that data available in RSS feeds, you can retrieve data for the vicinity, based on the current location, and display condition information such as wind speed, wave height, and temperature. Although we won t cover non-location-related details in this chapter, such as using HTTP to pull the RSS feed data, the full source code for the application is available with the code download for this chapter. Our Wind and Waves application has several main screens, including an Android MapActivity with a MapView. These components are used for displaying and manipulating map information, as shown in figure 11.1.

GET requests are also supported via Ajax and they can achieve the same results as POST requests The only main difference is that the data sent back to the server is passed in the tail of a URL, known as the query string, rather than in HTML headers Figure 11-3 shows the Amazon mobile home page being loaded into a <div> </div> pair of tags using this plug-in