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Good Design Principles
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While building circuits for your robots, observe the good design principles described in the following sections, even if the schematic diagrams you are working from don t include them.
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PULL-UP/PULL-DOWN RESISTORS
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When a device is unplugged, the state might waver back and forth, which can influence the proper functioning of your program. Use pull-up or pull-down resistors on all such inputs (6.8K to 10K should do it). In this way, the input always has a default state, even if nothing is connected to it. With a pull-up resistor, the resistor is connected between the input and the V supply of the circuit; with a pull-down resistor, the resistor is connected between the input and ground, as shown in Fig. 6.4.
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Output Pull-down resistor
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FIGURE 6.4 Use a pull-up or pull-down resistor to ensure that an input never floats.
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TIE UNUSED INPUTS LOW
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Unless the instructions for the component you are using specify otherwise, you should tie unused inputs to ground to keep them from floating. This is especially important for CMOS integrated circuits. A floating input can cause the circuit to go into oscillation, rendering it practically unusable.
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USE BYPASS CAPACITORS
Some electronic components, especially fast-acting logic chips, generate a lot of noise in the power supply lines. You can reduce or eliminate this noise by using bypass capacitors. These are capacitors of between 0.1 and 10 F that are positioned between the V and ground terminals of the noisy chip. Some designers like to use a bypass capacitor on every integrated circuit, while others place them beside every third or fourth chip on the board. It s also a good idea to put bypass (so-called decoupling) capacitors between the V and ground rails of any circuit at the point of entry of the power supply wires, as shown in Fig. 6.5. Many engineering texts suggest the use of 1 to 10 F tantalum capacitors for this job. Be sure to orient the capacitor with proper polarization.
KEEP LEAD LENGTHS SHORT
Long leads on components can introduce noise in other parts of a circuit. The long leads also act as a virtual antenna, picking up stray signals from the circuit, from overhead lighting, and even from your own body. When designing and building circuits, strive for the shortest lead lengths on all components. This means soldering the components close to the board and clipping off any excess lead length.
AVOID GROUND LOOPS
A ground loop is when the ground wire of a circuit comes back and meets itself. The V and ground of your circuits should always have dead ends to them. Ground loops can cause erratic behavior and excessive noise in the circuit.
Bypass or decoupling capacitor
FIGURE 6.5 Add decoupling and bypass capacitors near active electronic components (like ICs and microprocessors).
Ground
74 ELECTRONIC CONSTRUCTION TECHNIQUES
Soldering Tips and Techniques
Few electronic projects can be assembled without soldering wires together. Soldering sounds and looks simple enough, but there really is a science to it. If you are unfamiliar with soldering or want a quick refresher course, read the primer on soldering fundamentals provided in the next several sections.
TOOLS AND EQUIPMENT
Good soldering means having the proper tools. If you don t have them already, you can purchase them at Radio Shack and most any electronics store. Let s take a quick look at the tools you will need.
Soldering iron and tip You ll need a soldering iron, of course, but not just any old soldering iron. Get a soldering pencil with a low-wattage heating element, such as the model in Fig. 6.6. For electronics work, the heating element should not be higher than about 30 watts. Most soldering pencils are designed so you can change the heating elements as easily as changing a light bulb. Avoid using a soldering iron that is not grounded, or you will risk damaging sensitive electronic components by subjecting them to electrostatic discharge. Do not use the instant-on type soldering guns favored in the old tube days. They create far too much unregulated heat. If your soldering iron has a temperature control and readout, dial it to between 665 and 680 Fahrenheit. This provides maximum heat while posing the minimum danger of
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