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    SENSORS AND APP                                                                          CHAPTER

                     FUNCTIONALITY                                                                           B3

                        learning outcomes

                       The student will be able to:
                          understand how sensors enhance app functionality by collecting environmental data.
                          identify different sensors and their everyday applications.
                          design and develop a Pedometer App using MIT App Inventor.
                          program the app to start, stop and reset step counts accurately.
                          debug and fix common issues to ensure smooth app performance.

                     Sensors help phones and devices  feel  and  understand the world  around them, like
                     movement, light and location. They make apps fun and useful, like helping in games, maps
                     and fitness tracking. In this chapter, we will learn about different sensors and create a
                     Pedometer App to count steps using the Pedometer Sensor.

                               SENSOR

                     A sensor is a component that helps an app interact with the physical environment by
                     detecting motion, location, sound and other data from the device. Sensors can be found
                     in the Sensors category in the Palette.

                     TYPES OF SENSORS AND THEIR APPLICATIONS

                     There are many different types of sensors that help devices detect and respond to changes
                     in their surroundings.

                     1. Accelerometer Sensor
                     An accelerometer sensor is like a tiny helper inside your phone that feels when the phone
                     moves, shakes or tilts. Used in gaming apps to control characters by tilting the phone, in
                     fitness apps to track movement and in security apps to detect phone drops or theft.

                     2. Barcode Scanner
                     A barcode scanner is like a magic eye in your phone that can read secret codes on
                     objects. Used in shopping apps to scan product barcodes, library apps for book check-ins
                     and payment apps to scan QR codes for transactions.

                                                                                           Sensors and App Functionality  101

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