SENIOR DESIGN PROJECT 1/23/06

Schematic vs Board Layout

Pinouts and Datasheets

Debugging

Soldering and Standards Wiring: Black for ground and red for plus! Soldering: Both parts have to be equally heated. The thicker the material, the longer it takes to heat up. Solder should just be “absorbed in,” not be smeared on… .

H-Bridge and Power

H-Bridge and Power C Motor Control with a TIP120 TransistorThis example assumes you're using a DC motor that runs on low voltage DC, in the 5-15V range. Connect leads to Its terminals, and run if from a benchtop power supply if you have one. Try changing the voltage on it, and seeing what effect it has. Don't go over the motor's rated voltage. Connect a switch in series with the motor and use it to turn on the motor. Connect the base of a TIP120 transistor to one pin of your microcontroller. Note the second power supply. Most motors take a great deal more current than a microprocessor , and need their own supply. The example below uses a 9V battery as a separate power source. Whatever motor you use, make sure the power source is compatible (i.e. don't use a 9V battery f or a 3V motor!). Although the example shown is on a BX-24, you can use it with any microcontroller. Just connect the 1K resistor to the output pin of your microcontroller.

H-Bridge and Power This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn't use exotic parts.

http://www.allegromicro.com/ H-Bridge and Power

H-Bridge and Power

H-Bridge and Power

H-Bridge and Power PWM MOTOR DRIVER

Translating Rotational Movement WORM GEAR

Translating Rotational Movement Linkages

Translating Rotational Movement Belt Drive

Translating Rotational Movement Mechanical Movements

Robotic Mechanisms http://www.beatrizdacosta.net/projects.html

Motor Positioning

Motor Positioning

Motors

Relays and Solenoids

THOUGHT EXPERIMENT ONE -> design vs marketing …. -> work alone….

Announcements Engaging Ambivalence + Guest Speaker next week. Project Proposal & Presentation on FEB 6 ->start researching now! FAB Lab Tomorrow

Final Project/Presentation http://www.squid-labs.com/ http://www.instructables.com/

Kevin Assignment The purpose of this assignment is to use the LCD, joystick, light sensor, and piezoelectric sounder. For this assignment you will use the Butterfly to decode morse code sent "wirelessly" with light. Project Requirements: * Write decoded text to the LCD. * Demonstrate joystick-based user interface. * Calibrate high and low light thresholds. * Detect morse code dots (short pulses) and dashes (long pulses). * Signal dots and dashes through different sounds on piezo (longer/shorter or higher/lower frequency). * Decode dots and dashes into A-Z and 0-9 based on standard morse code. * Display at least 10 characters on LCD and clear screen. (Do not need to be able to show spaces.) Testing: You should be able to display the following using decoded light: 1. "HELLOWORLD" (quotation marks not included) 2. Your choice of any short word. 3. Our choice of one 5 letter word

Assignments (for today) FAB READING ONE 1.: On Page 4 the author compares the world to computer: "If the world is a computer, then the science of computing is really the science of science." How do you feel about this statement? Do you agree? Could you forsee potential downsides to looking at the world through this lense? [200-300 words] 2.: What is Gershenfeld's overall argument throughout the first half of the book? Why does he belief in the future of personal fabrication and how does he relate it to previous developments in computing technologies? What are his main hopes? Does his approach relate in anyway to the open source movement, and if so, how? [300-400 words] 3.: Gershenfeld describes several projects which have been developed by MIT students over the past years. Is there any particular one that particularly strikes you as an interesting project? Why? [200 words] 4.: Gershenfeld describes the roles and inventions of Anil Gupta, Nan Kyei and Mel King within their respective communities. Can you think of a particular "invention" that would be useful within your "community" ? What would that be? - KELLY’S WORK http://web.media.mit.edu/~monster/

EAGLE OVERVIEW