Meeting Minutes for 2012-02-08

buildscc | 08 Feb 2012 | | meeting-minutes

02/08/2012

Kyle Brogle

Allan Wirth

John-Nicholas Furst

Valerie Young

Monica Gribouski

Christopher Woodall

Anthony Inzero

John-Nicholas Furst

Danny Cooper

John-Nicholas Furst

David House

Monica Gribouski

Avery Gray

Christopher Woodall


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Foucault Pendulum

Overview

This is a joint BUILDS - PHOTON project. BUILDS is working on a small scale model for PHOTON to take and work with BU to have a large scale model installed in a building on campus (SCI?).

Joining

If you want to join this project, email John-Nicholas Furst

Background Research

Build an Accurate Foucault Pendulum: [1]

Result

After a consultation with PHOTON BUILDS engineers discussed with PHOTON that they would need approval from structural engineers, BU Facilties, and Boston Building Modifications Board.

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Tweeting Typewriter

Overview

Christopher Woodall and Tom Nadovich found a semi functional typewriter being thrown out around campus. We have decided to fix it up to a semi functional condition and turn it into a tweeting typewriter.

Design

Specifications

  • Make typewriter semi functional

Parts List

  • Royal Jupiter 12 typewriter (current use)

Ideas For Getting Key Inputs

Using conductive tape, we can sense if the conductive levers for the keys are touching the tape or not. We would do this by grounding and filtering the metal contacts on the typewriter. Then connect the conductive tape to a uC pin and 5V through a 10k Resistor. This will give us a digital input of 0 when the key is unpressed and 1 when its been triggered. Detection time depends on how fast the machine moves the lever. If the body of the typewriter is connected to ground there should be limited potential for AC noise. Needs a series of multiplexers and possibly some other supporting electronics to make communication with such a multiplexer practical. Would use part of an 6-bit 64 input multiplexer. Could get complex and hard to deal with, but would be straightforward.

This other guys uses shift registers to pass a pulse through each key at a very rapid speed. When a key is pressed down and the shift register sends that contact high you will send the carriage high. Since you have a counter which can tell where the signal is/should be at any given point in time you can effectively find which key was pressed down using a bunch of shift registers and two uC pins.

USB Type Writer

Members