c# create barcode 1: Accessory Overview in Objective-C

Generate QR Code in Objective-C 1: Accessory Overview

CHAPTER 1: Accessory Overview
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everything can be programmed in an off-the-shelf chip, smaller than a pea, and is more powerful than personal computers of just two decades ago. The software to develop the circuit boards comes for free from rapid prototyping houses that will turn around your board in just a few days for as little as one hundred dollars. You can see the area where I developed my first iPhone accessory in Figure 1 4.
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Figure 1 4. A madman s iPhone lair. Note the use of PCs in the accessory development process
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Logic design, soldering, programming, and mechanical design are just some of the skills required to make a legitimate iPhone accessory. Fortunately, there are thousands of resources available instantly via online search engines to help you find the resource that you need to make your dream a reality. To get a better idea of what it takes to develop an iPhone hardware accessory, let s take a look at the insides of one.
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Credit Card Reader
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Rather than focus now on our game controller, let s take a closer look at another typical accessory for an iPhone. iPhone PoS terminal applications allow the small business to enter a customer s purchase, connect to an online merchant services account, and charge the card for the amount of purchase. The merchant no longer has to worry about bad checks or credit card transactions that won t get approved. Up until now, these PoS applications were just that applications that ran on the iPhone and nothing else. The merchant manually entered the card number, expiration date, card code, and other information required for the transaction. Mistakes were easily made.
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CHAPTER 1: Accessory Overview
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Further, because the complete card stripe data was not sent to the merchant services account, the transaction was processed as if the card was not present. This results in higher fees for each transaction than if the card was swiped and the actual data transmitted. By attaching a credit card reader to the iPhone PoS application, the actual data from the card s magnetic stripe is sent, requiring much less manual data entry, and allowing the merchant lower fees for each transaction (see Figure 1 5).
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Figure 1 5. iPhone Point of Sale Terminal
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Breaking down the PoS terminal determines that it is composed of two primary components. The card reader subassembly provides a slot for the card to slide through which aligns it up to the proper area of the read head, and the logic board connects the wires from the read head to the 30-pin connector of the iPhone. Figures 1 6 and 1 7 show the heart of the pPoS accessory, the logic board containing all the processing hardware. Note that there are two primary integrated circuits (ICs) that make up the function on the logic board. The chip on the left, the controller, contains all the processing logic of the accessory and is where the firmware resides. The chip on the right contains all the security mechanisms to assure that this is an authorized accessory. The board is roughly 1mm thick and contains four layers of interconnections between the ICs and the other components. Plainly visible at the top is the 30-pin iPhone mating connector. In the lower right of the board s top view, you can plainly see the orange socket that connects via cable to the card reader subassembly.
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CHAPTER 1: Accessory Overview
Figure 1 6. Credit Card Reader (pPos) logic board (top view). The two black squares are the ICs that do most of the accessory s heavy lifting. The silver connector at the top attaches the board to the iPhone and the orange connector at the lower right goes to the card reader subassembly.
The key point to take away from this discussion of the PoS accessory is how simple the actual accessory really is. Think of it this way: the iPhone is a computer, to which you wish to attach something to do something. With an external accessory, you make this connection happen. You attach a card reader to do point of sale processing. You attach a thermocouple (temperature sensor) to monitor heating and cooling. You attach a knob and a button to play a game your game controller. NOTE: The distinction between what an accessory may be used for and the portion of the accessory that acts as merely an interface will not always be this clear. In some cases, the processor shown in the PoS terminal may act as both an interface and the accessory itself, only if the processor has been tasked to perform some special processing that cannot be done by the iPhone hardware alone.
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