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Build Your Own Combat Robot

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340 <strong>Build</strong> <strong>Your</strong> <strong>Own</strong> <strong>Combat</strong> <strong>Robot</strong><br />

the screw loosens a little, the connector could become loose. A loose wire can<br />

mean loses of control of your robot or could short out some of your components if<br />

it touches something it shouldn’t.<br />

Also, you should make it a practice to secure all of your wires so that they don’t<br />

move around in your robot. Zip-Ties make great tie-downs for wires.<br />

Static Sensitivity<br />

Certain metal oxide semiconductors are used on many robots, and these can be<br />

easily damaged by static from handling. Even large, high-power Metal Oxide<br />

Semiconductor Field Effect Transistor (MOSFETs) used to make power<br />

H-bridges can be zapped by static from hands. Many of the newer ICs and discrete<br />

semiconductors have input protection diodes to carry static charges. One way to<br />

determine which products can be damaged by static is to see what material it was<br />

packaged in when you bought it. If the leads are stuck in a black foam, or the part<br />

was stored in a pink plastic package or tube, it’s probably static sensitive.<br />

One way to prevent this is to use a static band to ground you to the equipment.<br />

This is a band you strap around your wrist; it has a wire and clip you attach to the<br />

circuit to be worked on. The use of an anti-static board, such as one of the pink<br />

plastic sheets on top of your work bench, works well to eliminate static. Dry and<br />

cold days, artificial fiber clothing, and most carpeting cause a lot of static<br />

build-up. Use common sense in your robot-building area.

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