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York Jong

How to free form the Bicore - 0 views

www.beam-online.com/...bicore.html

beam bicore electronics robot

shared by York Jong on 26 May 07 - Cached
  • York Jong on 26 May 07
     
    The Bicore is one of the easiest BEAM circuits to free form and can be built in 10 to 60 minutes depending on your skill level. I would recommend you read the whole tutorial first, this will GREATLY lower the chance of you making a mistake.
York Jong

The Player Project - 37 views

作者: JJS0527 (小信信) 看板: Robotics 標題: The Player Project 時間: Mon Oct 30 00:20:41 2006 The Player Project http://playerstage.sourceforge.net/ The Player Project creates Free Software that enables res...

simulator

started by York Jong on 28 May 07 no follow-up yet
Filip Bártek

Recursive Bayesian estimation - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Recursive_Bayesian_estimation

shared by Filip Bártek on 18 May 15 - No Cached
  • is constant relative to
  • is constant relative to
  • is constant relative to
  • ...13 more annotations...
  • Markov assumption
  • conditionally independent of the other earlier states
  • measurement at the k-th timestep is dependent only upon the current state
  • proportional
    • Filip Bártek
      Filip Bártek on 18 May 15
       
      It is proportional with the factor \alpha. \alpha = 1 / p(z_k|z_{1:k-1}) A way to compute the value of \alpha is shown below. It is common to all the updated states x_k at a given time k and measurement z_k.
  • predicted
  • marginalising out the previous states
  • predicted state
    • Filip Bártek
      Filip Bártek on 18 May 15
       
      p(x_k|z_{1:k-1})
  • update
  • predict and update steps
  • measurement likelihood
    • Filip Bártek
      Filip Bártek on 18 May 15
       
      p(z_k|x_k)
  • is constant relative to
  • can usually be ignored in practice
    • Filip Bártek
      Filip Bártek on 18 May 15
       
      We are typically interested in relative probabilities of the states. Equivalently [?], the p(x_k|z_{1:k}) across all the estimated states x_k is a probability distribution: \Sum_{x_k}{p(x_k|z_{1:k})} = 1
  • simply normalized, since its integral must be unity
Filip Bártek

Monte Carlo localization - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Monte_Carlo_localization

shared by Filip Bártek on 18 May 15 - No Cached
  • particle filter localization
  • typically starts with a uniform random distribution of particles
  • hopefully most particles will converge to where the robot actually is.
  • ...19 more annotations...
  • environment is static and does not change with time
    • Filip Bártek
      Filip Bártek on 18 May 15
       
      We also need to capture the robot's velocity in the state (pose) in case the robot has some momentum, so the three parameters may be not enough for a 2D robot.
  • assumes the Markov property
  • position and orientation
  • particles are uniformly distributed over the configuration space
  • Given a map
  • every time
  • every time
  • motion_update
  • sensor_update
  • sensor_update
  • some noise is applied
  • It now believes it is at one of two locations.
  • The robot has successfully localized itself.
  • actuation command
  • no actuator is perfect: they may overshoot or undershoot the desired amount of motion
  • the motion model must be designed to include noise as necessary
  • Particles which were consistent with sensor readings are more likely to be chosen
  • possibly more than once
  • a robot becomes increasingly sure of its position as it senses its environment
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

Pleo - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Pleo

calebchung pleo robot toy

shared by York Jong on 09 Sep 07 - Cached
  • camera-based vision system (for light detection and navigation) two microphones, binaural hearing beat detection (allows pleo to dance and listen to music) - this feature was removed but may be added on again. eight touch sensors (head, chin, shoulders, back, feet) four foot switches (surface detection) fourteen force-feedback sensors, one per joint orientation tilt sensor for body position infrared mouth sensor for object detection into mouth infrared transmit and receive for communication with other Pleos Mini-USB port for online downloads SD card slot for Pleo add-ons infrared detection for external objects 32-bit Atmel ARM 7 microprocessor (main processor for Pleo) 32-bit NXP ARM 7 sub processor (camera system, audio input dedicated processor) four 8-bit processors (low-level motor control)
  • York Jong on 09 Sep 07
     
    Pleo is a robotic dinosaur, made for all ages, designed to emulate the appearance and behavior of a week-old baby Camarasaurus. It was designed by Caleb Chung, the co-creator of the Furby, and manufactured by Ugobe.
York Jong

Photodiode - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Photodiode

electronics photoconductive photovoltaic sensor

shared by York Jong on 30 May 07 - Cached
  • Reverse bias induces only little current (known as saturation or back current) along its direction. But a more important effect of reverse bias is widening of the depletion layer (therefore expanding the reaction volume) and strengthening the photocurrent. Circuits based on this effect are more sensitive to light than ones based on the photovoltaic effect and also tend to have lower capacitance, which improves the speed of their time response. On the other hand, the photovoltaic mode tends to exhibit less electronic noise.
  • Photodiodes can be used under either zero bias (photovoltaic mode) or reverse bias (photoconductive mode)
    • York Jong
      York Jong on 31 May 07
       
      zero bias -> photovoltaic mode -> basis for solar cells
      reverse bias -> photoconductive mode -> similar to LDR
York Jong

BASIC Stamp - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/BASIC_Stamp

basic-stamp pic robot

shared by York Jong on 09 Sep 07 - Cached
  • The BASIC Stamp is a microcontroller with a small, specialized BASIC interpreter (PBASIC) built into ROM.
  • The third variant is the Javelin stamp. This stamp uses Sun Microsystem's Java programing language instead of Parallax's PBasic
  • all current PICs are Flash-based, and support in-circuit programming.
  • ...2 more annotations...
  • The Basic Stamp > interprets instructions in real-time, essentially running a virtual machine on the PIC. This means that it is much slower
  • The Stamp implements a complete solution on a single PCB. In comparison, a bare PIC requires a separate power regulator and substantial decoupling on its output.
York Jong

BEAM robotics - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...BEAM_robotics

beam biology electronics mobile robot

shared by York Jong on 27 May 07 - Cached
  • York Jong on 27 May 07
     
    The word "beam" in BEAM robotics is an acronym for Biology, Electronics, Aesthetics, and Mechanics. This is a term that refers to a style of robotics that primarily uses simple analog circuits instead of a microprocessor in order to produce an unusually s
York Jong

Mark Tilden - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Mark_Tilden

beam biology electronics mobile robot

shared by York Jong on 27 May 07 - Cached
  • York Jong on 27 May 07
     
    Mark W. Tilden is perhaps most well known for his invention of BEAM robotics. He is a robotics physicist, who produces complex robotic movements from simple logic circuits, often all on the single logic chip and without a microprocessor.
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