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7.8 ELIMINATING STATIC ELECTRICITY
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FIGURE 7-7 Using connectors makes for more manageable robots. Use connectors on all subsystems of your robot.
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When making interconnecting cables, cut the wires to length so there is a modest amount of slack between subsystems. You don t want, or need, gobs of excess wire. Nor do you want the wire lengths so short that the components are put under stress when you connect them together.
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7.8 Eliminating Static Electricity
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The ancient Egyptians discovered static electricity when they rubbed animal fur against the smooth surface of amber. Once the materials were rubbed together, they tended to cling to one another. Similarly, two pieces of fur that were rubbed against the amber tended to separate when they were drawn together. While the Egyptians didn t understand this mysterious unseen force better known now as static electricity they knew it existed. Today, you can encounter static electricity by doing nothing more than walking across a carpeted floor. As you walk, your feet rub against the carpet, and your body takes on a static charge. Touch a metal object, like a doorknob or a metal sink, and that static is quickly discharged from your body. You feel the discharge as a shock. Carpet shock has never been known to kill anyone. The amount of voltage and current is far too low to cause great bodily harm. But the same isn t true of electronic circuits. Considering how your body can develop a 10,000- to 50,000-V charge when you walk across a carpet, try to imagine what that might do to electrical components rated at just 5 or 15 V. The sudden crash of electrical energy can burn holes right through a sensitive transistor or integrated circuit, rendering it completely useless.
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ELECTRONIC CONSTRUCTION TECHNIQUES
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Transistors and integrated circuits designed around a metal-oxide substrate can be particularly sensitive to high voltages, regardless of the current level. These components include MOSFET transistors, CMOS integrated circuits, and most computer microprocessors.
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7.8.1 STORING STATIC-SENSITIVE COMPONENTS
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Plastic is one of the greatest sources of static electricity. Storage and shipping containers are often made of plastic, and it s a great temptation to dump your static-sensitive devices into these containers. Don t do it. Invariably, static electricity will develop, and the component could be damaged. Unfortunately, there s no way to tell if a static-sensitive part has become damaged by electrostatic discharge just by looking at it, so you won t know things are amiss until you actually try to use the component. At first, you ll think the circuit has gone haywire or that your wiring is at fault. If you re like most, you won t blame the transistors and ICs until well after you ve torn the rest of the circuit apart. It s best to store static-sensitive components using one of the following methods. All work by grounding the leads of the IC or transistor together, which diminishes the effect of a strong jolt of static electricity. Note that none of these storage methods is 100 percent foolproof.
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Anti-static mat. This mat looks like a black sponge, but it s really conductive foam. You can (and should) test this by placing the leads of a volt-ohm meter on either side of a length of the foam. Dial the meter to ohms. You should get a reading instead of an open circuit. The foam can easily be reused, and large sheets make convenient storage pads for many components. Anti-static pouch or bag. Anti-static pouches are made of a special plastic (which generates little static) and are coated on the inside with a conductive layer. The bags are available in a variety of forms. Many are a smoky black or gray; others are pink or jet black. As with mats, you should never assume a storage pouch is anti-static just from its color. Check the coating on the inside with a volt-ohm meter its resistance should be in the 10k to 1 M range. Anti-static tube. The vast majority of chips are shipped and stored in convenient plastic tubes. These tubes help protect the leads of the IC and are well suited to automatic manufacturing techniques. The construction of the tube is similar to the anti-static pouch: plastic on the outside, a thin layer of conductive material on the inside. You can often get tubes from electronic supply stores by just asking for leftover tubes that would normally be thrown away. It is a good idea to only put one type of chip in each tube, label the tube, and keep the same family of chips together. This will make finding specific components much easier.
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