By Alasdair Allan

Flip your iPhone or iPad into the hub of a disbursed sensor community with the aid of an Arduino microcontroller. With this concise advisor, you’ll how one can attach an exterior sensor to an iOS machine and feature them check with one another via Arduino. You’ll additionally construct an iOS software that may parse the sensor values it gets and plot the ensuing measurements, all in real-time.

iOS approaches facts from its personal onboard sensors, and you can now expand its achieve with this easy, inexpensive venture. If you're an Objective-C programmer who loves to test, this publication explains the fundamentals of Arduino and different elements you need—and allows you to have a good time within the process.
* tips on how to attach the Arduino platform to any iOS equipment
* construct an easy program to regulate your Arduino without delay from an iPad
* assemble measurements from an ultrasonic diversity finder and demonstrate them in your iPhone
* attach an iPhone, iPad, or iPod contact to an XBee radio community
* discover different equipment for connecting exterior sensors to iOS, together with Ethernet and the MIDI protocol

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Additional info for iOS Sensor Apps with Arduino: Wiring the iPhone and iPad into the Internet of Things

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In the Attributes inspector, set the View mode to be Aspect Fill, and the Image to be the Arduino image you added to your project a few moments ago. You should see something like Figure 3-1. Next drag twelve UISwitch elements from the Object library and position them as in Figure 3-2, in two blocks of six switches next to digital pins 2 through 13. We’re going to use these switches to switch the Arduino’s digital pins from LOW to HIGH and back again. 40 | Chapter 3: Controlling the Arduino from the iPad Figure 3-1.

Now let’s make the Arduino do something other than sending messages, and turn some LEDs on and off directly from our iPad. An Arduino on Your iPad We’re going to go ahead and build a simple application for the iPad that will let you pull an arbitrary pin on the Arduino HIGH or set it LOW. While we’ll be building the application for the iPad, because I want to take advantage of all that screen real estate, the code will run just fine on the iPhone (or the iPod touch) if you want to build it as an application for the iPhone without any modification.

The completed jumper cable Once you have bought or built your jumper cable, connect the Redpark Serial Cable to your RS-232 to TTL serial adaptor, and that in turn (using your jumper cable) to your Arduino board, as shown in Figure 2-7. To do so, connect the VCC pin of your adaptor to the 5V pin on the Arduino, the GND pin to one of the available GND pins on the Arduino, the RX pin on the adaptor to the TX pin on the Arduino, and the TX pin on the adaptor to the RX pin on the Arduino. The receive (RX) pin on your Arduino board (pin 0) must be routed to the transmit (TX) pin on your adaptor, and the transmit (TX) pin on the Arduino board (pin 1) must in turn be connected to the receive (RX) pin on your adaptor.

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