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York Jong

Robotics -- Logo Products - 0 views

el.media.mit.edu/...robotics.html

5star collection logo robot toy

shared by York Jong on 19 Jun 07 - Cached
  • Many Logo-based and other robotics products produced by LEGO are distributed to schools in the USA by Pitsco.
  • This free-range turtle does not require connection to a computer. All the controls are on board.
  • The Cricket is a tiny computer, suitable for all kinds of robotics projects, that you can program using Logo.
  • York Jong on 19 Jun 07
     
    Logo has long been used to control mechanical turtles and other robotic devices. Here are some sources of equipment and related software.
York Jong

BEAM Pieces -- Integrated circuits - 0 views

library.solarbotics.net/...parts_elect_ic.html

5star beam collection electronics ic motor robot solar survey

shared by York Jong on 27 May 07 - Cached
  • 1381s are CMOS voltage-controlled triggers -- these "gate" a source until the voltage is above some "trip" limit, at which point it is allowed onto a third pin
  • We use them as 3- or 5-volt triggers
  • This chip is often considered the heart of Nv net technology
  • ...22 more annotations...
  • The '240 is often called "the bicore chip," because we can take advantage of the 240's inverters to turn a single 74*240 into a bicore
  • The '240 also has tri-state outputs, so an enable line can be used to turn its outputs on and off simply (good for adding reversing capability to a 'bot).
  • any *cores built with a 74*04 will require additional logic "downstream" to amplify the current to levels sufficient to drive a moto
  • Schmitt triggers can't easily be used in suspended bicore implementations
  • use its buffers as little current amplifiers
  • it is usable for either grounded or suspended bicore designs (but better for suspended)
  • 74HC/HCTxx non-buffers (74HC14 or 74HC04) draw about half of the current consumption, and have about half the drive current compared to HC / HCT buffer chips (74HC240 or 74HC245). Non-buffer chips are thus better for oscillators, say Nv and Nu applications; they are not suited for use in driving motors.
  • 74AC is best suited for motor driver applications with all inputs driven rail to rail.
  • The '245 is an octal buffer chip, and so has 8 channels of buffering power available for our misuse. This chip was designed for data transmission uses, but we'll misuse it as a motor driver chip
  • The '244 provides us with 8 (thus the "octal") buffers, enableable in banks of 4. This is a very useful chip for amplifying small currents
  • it can drive up to 4 motors in 2 directions each, or you can "buddy up" inputs and outputs to drive fewer motors at higher current
  • it can drive up to 4 motors in 2 directions each, or you can "buddy up" inputs and outputs to drive fewer motors at higher current
  • If you can't find 1381s locally, you might have better luck finding its European cousin, the TC-54 -- for details on it
  • Note that if you need more than about 200 mA per motor, you'll need to use an H-bridge, or some similar motor driver
  • The ideal BEAM circuit would use a low (2V-3V) voltage core and sensors combined with level shifting high (5-6V) volt motor drivers to maximize efficiency.
  • 74ACxxx used in typical BEAM applications uses 4x more supply current than does 74HC/HCTxxx.
  • York Jong on 27 May 07
     
    The following material is intended to cover usage and part selection details of ICs you're most likely to see in BEAM robots.
York Jong

BEAMbot Circuits << BEAM Reference Library - 0 views

www.solarbotics.net/...default.htm

5star beam circuit electronics portal robot

shared by York Jong on 27 May 07 - Cached
  • York Jong on 27 May 07
     
    This section of the BEAM Reference Library is devoted to collecting designs (and links to designs hosted elsewhere) for circuits of interest to BEAMers.
York Jong

HomePage of GoGoBoard - 0 views

padthai.media.mit.edu/...home.xsp

diy gogo-board logo mit opensource robot

shared by York Jong on 09 Sep 07 - Cached
  • York Jong on 09 Sep 07
     
    The GoGo board framework is a collection of open-source hardware platforms mainly aimed for educational projects.
York Jong

BEAM Reference Library -- BEAMbot Pieces - 0 views

www.solarbotics.net/...default.htm

beam collection electronics portal robot

shared by York Jong on 26 May 07 - Cached
  • York Jong on 26 May 07
     
    You'll be making use of a number of components in the creation of your BEAM robot. This section's pages describe the most-common of them.
York Jong

Behavior-Based Control: A Brief Primer - 0 views

robotics.usc.edu/bbs.html

5star behavior-based delicious imported robot theory

shared by York Jong on 26 May 07 - Cached
  • Note that behaviors themselves can have state, and can form representations when networked together. Thus, unlike reactive systems, behavior-based systems are not limited in their expressive and learning capabilities.
  • York Jong on 26 May 07
     
    Behavior-based controllers consist of a collection of behaviors. Behaviors are processes or control laws that achieve and/or maintain goals.
York Jong

BEAM From the Ground Up - 0 views

bftgu.solarbotics.net/

5star beam electronics portal robot

shared by York Jong on 26 May 07 - Cached
  • York Jong on 26 May 07
     
    Welcome to the leaner, cleaner, BEAM From the Ground Up! This site is designed to be a useful collection of material for BEAM roboticists of all experience levels and abilities. The unifying focus here is on learning -- so this is the place to look for tu
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