Physics 219 - Project 1 At this point in the course you’ve built a lot of circuits and you have been exposed to most of the essential ideas in electronics. But the really fun and powerful part of electronics is learning how to design and build your own circuits Also you’ve now got at your disposal the LogoChip, a versatile building block for helping you make interesting things. The first design project is pretty open ended. I want you to concentrate on using the parts we’ve learned about (e.g. resistors, capacitors, diodes, transistor switches, LogoChip, photocells, motors, beepers, and numerical displays) to build something that you find interesting. This first project is due on Friday, October 18. You should be ready to show off your creation in class that day, and also hand in a short “manual” that documents what you’ve built. Here’s a list of ideas to get you started, but you shouldn’t feel bound to do something on the list. 20 Things to Do With a LogoChip 1. LogoLights – Connect LEDs to a LogoChip to make a novel display. Make interactive jewelry that features dynamic patterns of light. Arrange the LEDs a circle and display information by varying the “speed of rotation” around the circle or the size of a “sector”. Make your own bike display, but instead of making characters trying making dynamic patterns 2. Smart Alarms (Make soem king of “burglar alarm”, a refrigerator alarm or a diary security system, for example.) 3. Clocks – Make a stopwatch that uses a unique way to display the time. 4. Make Your Own Music – Start with a simple beep + square waves (perhaps making use of the PIC’s built in pulse width modulation feature.) Improve the sound quality by making your own sinusoidal wave tables. Improve sound further by modifying wave tables to correspond to different instruments. Connect a simple resistive sensor to make your own musical instrument, say a Play-Doh synthesizer or an Ice Theramin. 5. Automatic pet feeders or a plant waterers 6. Braitenberg Creatures - Make a creature that exhibits an interesting behavior based on simple sensors and rules. (See Valentino Baitenberg’s inspiring book Vehicles.) 7. Make Your Own Kinetic Sculpture or Interactive Art 8. Make Your Own Meter - We made a capacitance meter in class. Perhaps you could measure something more interesting. 9. Make Your Own Strobe Light (edgerton.doc) – This can be made using the transistor driven high brightness LEDs used in the bike speedometer. Use the strobe to look at a vibrating guitar string. Use the strobe to take high speed photo of a bat hitting a ball. 12. Marble Machines – Make your own programmable Fridge-Its, marble mazes, chain reactions, mini-golf (micro-golf), or pinball. 13. Make Your Own Sensor – Build a shadow sensor, or another simple sensor in the spirit of the Radio Shack / Forest Mims books. For example a Pinwheel and a reflectance sensor makes a wind speed sensor; use it to blow out electronic birthday candles. 14. Make Your Own Electronic Test Equipment – What do if you can’t afford an oscilloscope. Build something that can tell if the “clock” on a newly constructed LogoChip is running. Make a high speed logic analyzer, a digital voltmeter, or a simple logic probe. 15. Hack a Toy - Hack into a commercially manufactured toy such as bubble gun or a LEGO Duplo car. 16. Communicating Crickets – Communicate between two LogoChips by exchanging beeps, flashes of light, water drops or smoke signals. 17. Smart Coffee Cup – Keeps your coffee at the perfect temperature. 18. Build Your Own “Lock-in” amplifier for measuring weak signals. A lock-in amplifier improves the signal-to-noise ratio by arranging the signal of interest to have a known, well defined frequency. Perhaps you could make your own, more sensitive “reflectance sensor.” to lockin setamount 0 repeat 32 [ led-on mwait 1 setamount amount + sensor-reading led-off mwait 1 setamount amount - sensor-reading] output amount end 19. Make Your Own Things.- use stepper motors to make your own Etch-a-Sketch (using the Fisher-Technick plotter). This can be viewed as a first step towards making your own “CNC” machine. 20. Think of 20 More Things To Do With A LogoChip Other LogoChip Projects: AM radio – set PWM to 600 kHz square wave and toggle it on and off at audio frequencies to send notes to an AM radio in the next room.
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