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Building iPhone and iPad Electronic Projects: Real-World by Mike Westerfield

By Mike Westerfield

Why easily play song or go browsing in the event you can use your iPhone or iPad for a few particularly enjoyable tasks, corresponding to development a steel detector, hacking a radio keep an eye on truck, or monitoring a version rocket in flight? tips on how to construct those and different cool issues by utilizing iOS gadget sensors and cheap comparable to Arduino and a Bluetooth Low strength (LE) Shield.

This hands-on ebook exhibits you the way to jot down basic functions with techBASIC, an Apple-approved improvement surroundings that runs on iOS units. by utilizing code and instance courses outfitted into techBASIC, you’ll easy methods to write apps at once in your Apple machine and feature it engage 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 assemble acceleration and rotation data
• Hack a radio keep watch over truck with Arduino and Bluetooth LE
• Create an arcade online game with an iPad controller and iPhone paddles
• regulate a sweet laptop with an iOS gadget, a micro servo, and a WiFi connection

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Extra info for Building iPhone and iPad Electronic Projects: Real-World Arduino, Sensor, and Bluetooth Low Energy Apps in techBASIC

Example text

This code is simpler because it only has one plot to update, not three, but is otherwise the same: ! Update the plot. 1 THEN ! Update the arrays holding the points to plot. 1 FOR i = 1 TO 99 mm(i, 2) = mm(i + 1, 2) NEXT mm(100, 2) = fieldStrength WEND ! Adjust the function range based on the maximum observed value. setView(-10, -range, 0, range, 0) ! Update the plots. setPoints(mm) END IF END SUB There are some similar changes at the start of setUpGUI, where the plot and plot array are initialized.

It’s the accuracy of the reading, which was –1 for the first three readings. That means these readings are not accurate at all, and reminds us that it takes a while for the heading to return valid values. Even after the heading settles down, the accuracy is not that good; iOS is only claiming the heading is good to within 40 degrees. The last value is the time when the reading was taken. Location The last service from the Sensors class is the location. Is that a new internal sensor, or a report from the external sensors made up of the GPS satellite system?

The last value is the time when the reading was taken. Location The last service from the Sensors class is the location. Is that a new internal sensor, or a report from the external sensors made up of the GPS satellite system? I think of it as a combination. In any case, it’s used pretty much like the heading and, like the heading, takes some time to warm up. Here’s a short sample that shows how to read the location. ##"; location(3) PRINT USING "Horiz. ###"; location(4) PRINT USING "Vert. ###"; location(6) PRINT USING "Direction : ####"; location(7) PRINT "Time stamp : "; location(8) Running it from my desk, here’s what I got with a few digits of precision removed from the location—it’s pretty accurate!

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