Experiment 33: Moving in Steps

Chapter Experiment 33: Moving in Steps

Make Electronics Book Learning by Discovery
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Make Electronics Book Learning by Discovery

  • Experiment 33: Moving in StepsChapter 5284theoryCalculatingvoltagedrop(continued)This table shows the percent voltage lost in a circuit with 10-foot wire at 12 volts.Wire GaugeAmperes12345678910100.080.170.250.330.420.500.580.670.750.83120.130.270.400.530.660.800.931.11.21.3140.210.420.630.841.11.31.41.51.92.1160.330.671.01.31.72.02.32.73.03.4180.531.11.62.12.73.23.74.34.85.3200.851.72.63.44.35.16.06.87.78.5221.32.74.05.46.78.19.4111213242.14.36.48.6111315171921263.46.81014172024273134285.4111622273238434954308.6172634435260697786Remember, though, that the wire resistance will be higher if you are using stranded copper wire or tinned copper wire, and this will increase the percentage of voltage lost.Experiment 33: Moving in StepsTime now to build something more sophisticated: a cart that orients itself to-ward a light source. I’m going to tell you all you need to get started on this project, but this time I won’t go all the way to the end in exhaustive detail. I want you to get into the habit of figuring out the details, improving on plans, and eventually inventing things for yourself. You will need:• 555 timers. Quantity: 8.• Trimmer potentiometer, 2K linear. Quantity: 2.• LEDs. Quantity: 4. If you get tired of using series resistors to protect LEDs in a 12-volt circuit, consider buying 12-volt LEDs such as Chicago Miniature 606-4302H1-12V, which contain their own resistors built in. However, the schematic in Figure 5-108 assumes that you will use regular 2V or 2.5V LEDs.• Stepper motor: Unipolar, four-phase, 12-volt. Parallax 27964 or similar, consuming 100mA maximum. Quantity: 2.• Photoresistors, ideally 500 to 3,000Ω range. Quantity: 2.