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., 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.