Want to combine iPhone, iPad, and iPod touch sensors with external electronic gadgets? This hands-on book helps you build several projects, using these built-in magnetic, light, and proximity sensors with inexpensive boards such as Arduino and a Bluetooth Low Energy Shield. And you'll tackle these projects by writing programs in techBASIC, an Apple-approved development environment that runs directly on these iOS devices. That's right. You'll quickly learn how to build metal detector, moisture sensing meter, and a rocket-bound iPhone without using Objective-C and Cocoa to access Apple's sensors and without having to enroll in Apple's iOS developer program. With just a few lines of BASIC code, you can write your apps directly on your mobile device for rapid development and prototyping - and watch your project take shape! This book is ideal for hobbyists, students, professional engineers, industrial designers, and inventors.