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

By Mike Westerfield

Why easily play tune or log on in the event you can use your iPhone or iPad for a few relatively enjoyable tasks, similar to construction a steel detector, hacking a radio keep an eye on truck, or monitoring a version rocket in flight? how one can construct those and different cool issues through the use of iOS gadget sensors and cheap akin to Arduino and a Bluetooth Low strength (LE) Shield.

This hands-on e-book indicates you ways to jot down uncomplicated purposes with techBASIC, an Apple-approved improvement surroundings that runs on iOS units. through the use of code and instance courses outfitted into techBASIC, you’ll tips on how to write apps without delay in your Apple gadget 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 gather acceleration and rotation data
• Hack a radio regulate 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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Additional resources for Building iPhone and iPad Electronic Projects: Real-World Arduino, Sensor, and Bluetooth Low Energy Apps in techBASIC

Example text

1 seconds have elapsed since the last sensor reading. If so, a new one is recorded and displayed. Parameters: time - The time when the event occurred. accel The final subroutine is the one that actually collects and handles the acceleration data. This subroutine is called nullEvent. techBASIC calls it any time it is not busy doing The Accelerometer | 19 something else, which in this program means any time except when a tap on a button is being handled. The subroutine starts by grabbing the most recent accelerometer value.

02, samples) ! Find the average and maximum values for each ! sensor. ##"; _ mx/samples, my/samples, mz/samples While it’s not fancy, this complete program samples all three sensors at a rate of 50 samples per second for 5 seconds. It then prints the maximum and average values re‐ corded. This program is not one of the techBASIC samples. So how do you get it into techBASIC? Unfortunately, Apple is a tad overprotective of the iPhone here. Silly as it may be, there are only two ways to get the program to techBASIC.

The Gyroscope app The code is very similar, too. In fact, there are so few differences that we’re not going to go through the program line by line. Let’s look at the changes. The first and most obvious change is that we’re reading a different sensor. gyro There is another subtlety, though. Did you know that the gyroscope is only available in some models of the iPhone? That means it is very important to check to make sure it’s there before we use it. This changes the program in two places. The first is right in the setup code, when we grab our initial value for the time: !

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