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York Jong

Reduce Motor Noise - 0 views

www.kronosrobotics.com/...GAN142.shtml

5star anti-interference electronics motor noise

shared by York Jong on 27 May 07 - Cached
  • This is the 3 capacitor method.  I used this one in all my RC cars and many of the RC toys that I have taken apart use this method.
  • One of the easiest and most overlooked technique that can be done to lower motor noise is the twist your motor and motor power wires.  This in affect forces the magnetic fields to cancel each other out.
  • By placing a metal shield between your motors and radio can do wonders.  Also keep in mind that some metals shield better than others.   Carbon Steel shields several hundred times better than aluminum.  Dont use this shielding as a conductor or you may compound the problem.
  • ...1 more annotation...
  • Place your high current wires away from sensitive areas and antennas.  Don't run the wire parallel with wires that are used as signaling in your micro controller.  If you must its best to have them cross at 90 degrees.
  • York Jong on 27 May 07
     
    In the past when I built a Bot I would just slap it together and hope for the best. However when I started to use RC receivers to aid in the control of my bots the results left a lot to be desired.
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

ROBOT SENSOR INTERPRETATION - 0 views

www.societyofrobots.com/sensors_interpret.shtml

robot sensor

shared by York Jong on 14 Jun 07 - Cached
  • how to interpret sensor data into a mathematical form readable by computers
  • There are only 3 steps you need to follow: Gather Sensor Data (data logging) Graph Sensor Data Generate Line Equation
  • Some sensors (such as sonar and Sharp IR) do not work properly at very close range
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  • The way to get rid of noise is get a bunch of readings, then only keep the average. Make sure you test for noise in the actual environment your robot will be in
  • York Jong on 14 Jun 07
     
    Most roboticists understand faily well how sensors work. They understand that most sensors give continuous readings over a particular range. Most usually understand the physics behind them as well, such as speed of sound for sonar or sun interference for IR. Yet most do not understand how to interpret sensor data into a mathematical form readable by computers.
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
ubtechcommercial

auto room cleaning machine - 0 views

commercial.ubtrobot.com/...mercial-cleaning-robot-machine

auto room cleaning machine

shared by ubtechcommercial on 09 Dec 24 - No Cached
  • ubtechcommercial on 09 Dec 24
     
    Empowered by Technology Modular Design for Rapid Disassembly within 5 Seconds* Robust Endurance, Single Dust-Pushing Capacity of 4,400 Square Meters* Compact Body Design for Seamless Maneuverability in Complex Environments Ultra-Low Noise Cleaning for Discrete Operations in Quiet Settings Integrated Suction, Scrubbing, and Pushing Capabilities, Ideal for a Wide Range of Soft and Hard Surfaces CleInbot CC201: An Intelligent auto room cleaning machine
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