visual basic barcode scanner input GUTTING A POLAROID SUN 660 CAMERA in Software

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GUTTING A POLAROID SUN 660 CAMERA
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Before moving on to the next subject of the chapter, it s worth noting that used Polaroid cameras are commonly available in thrift stores and on Internet auction sites such as eBay.
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Even models with the built-in sonar ranging system are commonly available for under $10, and unless the camera has been damaged, they likely still work. (This is a testament to the excellent manufacturing quality of Polaroid cameras, despite their snap-together construction, as you ll see in a bit.) Most of these cameras use a transducer and ranging module very similar to the units described already, though you will probably encounter a couple of variations. In addition, you must first disassemble the camera to extract the ultrasonic transducer and the ranging module board. This actually isn t as easy as it looks, because Polaroid was known for building their cameras with few, if any, screws. Instead, the cameras must be disassembled like a Chinese puzzle box: first this part, then that, then this one over here all the while being careful you don t break anything important. The methods for deconstructing the typical Polaroid camera are beyond the scope of this book, but here are a few tips. Bear in mind that when you dissect a Polaroid camera for its ultrasonic parts you render the camera completely inoperative:
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I Start first by removing the film door and/or film rollers. This is typically accomplished
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by finding and removing the small hinges and pins that hold these parts onto the main body of the camera. I Pry off the faceplate. Use a thin flat-bladed screwdriver and carefully look for the snap points. It s okay if you break off a little bit of plastic here and there. I When you reach the innards of the camera, locate the small plastic pins that secure the transducer element. This is a delicate part of the camera, so very carefully pry the transducer loose. Under no circumstances should you disassemble the transducer or touch the gold-plated contact surface inside. Doing so will ruin the transducer (the gold plating will come right off in your hands). Locate the ranging module and carefully pry it up (it ll likely be held down with two or more small plastic prongs). You can remove the wide multi-pin connector from the module, but keep the shielded wires to the ultrasonic transducer intact. When you are done, you should have something that looks like the module and transducer in Fig. 38.14. This module came out of a Sun 660, and not all Polaroid modules look the same. Though similar in design, the pinouts of the multi-pin connector are different from those found in the Model 6500 Ranging Module described earlier in the chapter. Table 38.3 lists the pinouts for the Model 6500 Ranging Module as well as the ranging module from the Sun 660. Note that the Sun 660 module has an eight-pin connector; the Model 6500 has a nine-pin connector. A disadvantage of using sonar ranging boards removed from Polaroid cameras is that in many cases, the board is not able to produce more than one ping of ultrasonic sound without recycling the power off, then back on. The Polaroid cameras from which the boards are taken are powered by a battery contained in the film pack. Between pictures, power to the electronics inside the camera is turned off, which resets the sonar ranging board. There are a number of ways to modify the sonar board to permit it to ping more than once, and without recycling its power. I ve found that one of the most effective and easy methods is to add a small single-pole, single-throw (SPST) five-volt relay between the sonar ranging module and the battery that powers it. The relay should be rated for at least one amp. The relay is controlled by the robot s microcontroller or microprocessor. A basic hook-up scheme for controlling a relay with a computer is shown in 18, Working with DC Motors.
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