By Mike Westerfield
Why easily play tune or log on in the event you can use your iPhone or iPad for a few fairly enjoyable tasks, comparable to construction a steel detector, hacking a radio keep an eye on truck, or monitoring a version rocket in flight? the best way to construct those and different cool issues by utilizing iOS gadget sensors and cheap equivalent to Arduino and a Bluetooth Low power (LE) Shield.
This hands-on ebook indicates you the way to jot down easy purposes with techBASIC, an Apple-approved improvement surroundings that runs on iOS units. by utilizing code and instance courses outfitted into techBASIC, you’ll the best way to write apps without delay in your Apple machine and feature it have interaction with different hardware.
• construct a steel detector with the iOS magnetometer
• Use the HiJack platform to create a plant moisture sensor
• positioned your iPhone on a small rocket to gather acceleration and rotation data
• Hack a radio regulate truck with Arduino and Bluetooth LE
• Create an arcade video game with an iPad controller and iPhone paddles
• regulate a sweet desktop with an iOS machine, a micro servo, and a WiFi connection
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Additional info for Building iPhone and iPad Electronic Projects: Real-World Arduino, Sensor, and Bluetooth Low Energy Apps in techBASIC
Lots of Options The accelerometer and gyroscope handle the plot update differently. Which do you like better? If you prefer one to the other, it’s an easy matter to change the program so it behaves the way you prefer. Since the program is now showing the current time at the right and going back 10 seconds into the past as you look farther left, the x-axis range has been changed from 0 to 10 to –10 to 0. The two changes needed to make this happen are in setUpGUI. The first is when the x values are initially assigned to the plot arrays: !
Finally, if we’re going to write stuff to a file, we need to open the file. The OPEN command opens a file for output. The Accelerometer | 17 Files in BASIC Files are one of those things that seem to be different in just about every programming language. If you’re already good at a programming language other than BASIC, most of what you have seen up to this point should be pretty easy to read, even if the syntax is not quite what you are used to. The OPEN command may look odd, though. BASIC files are referenced by a file number.
The program is called Magneto‐ meter: ! Shows a running plot of the local magnetic field for ! 1-second intervals. Supports ! recording the values and emailing the results. Create the plots and arrays to hold the plot points. DIM p as Plot, px as PlotPoint, py as PlotPoint, pz as PlotPoint DIM mx(100, 2), my(100, 2), mz(100, 2) ! Create the controls. DIM quit AS Button, record AS Button, send AS Button ! Create and initialize the global tracking variables. txt" recording = 0 ! Get and set an initial time for the magnetometer.