Appendix 20 Things to Do With a by fjhuangjun


									                           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

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

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

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
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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