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York Jong

MECHANICS - ROBOT CHASSIS CONSTRUCTION - 0 views

www.societyofrobots.com/nics_chassisconstruction.shtml

mechanics robot tutorial wheel

shared by York Jong on 31 May 07 - Cached
  • Large diameter wheels give your robot low torque but high velocity. So if you already have a very strong motor, then you can use wheels with larger diameters.
  • But if your motor is weak (such as if it does not have any gearing), you want to use a much smaller diameter wheel. This will make your robot slower, but at least it has enough torque to go up a hill!
  • Wheel width. You do not want it too wide as it causes increased resistance to rotating the wheel on a surface.
  • ...1 more annotation...
  • Make sure you get a motor which already has a gear box attached, as it makes your robot much better controlled, more efficient, and stronger.
  • York Jong on 31 May 07
     
    This robot tutorial should help you with the mechanical aspect of building your very first robot. You should have already read my build your first robot tutorial before moving on to this tutorial.
York Jong

[News] Superbot：可任意變形的模組化機器人 - 47 views

作者: mybigfish (ghoti) 看板: News 標題: [News] Superbot：可任意變形的模組化機器人 時間: Sun Feb 25 16:08:05 2007 Superbot：可任意變形的模組化機器人 Modular robot's wriggles show greater flexibility http://www.newscientisttech.com...

news

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

A Bot With Peripheral Vision - 0 views

www.geocities.com/...PVRoller.html

5star beam behavior-based circuit electronics photopopper phototrope robot

shared by York Jong on 27 May 07 - Cached
  • I wanted to share an adaptation of the Schead v4, that I have been experimenting with. It is (for lack of a better term) a Master/Slave Schmitt Comparitor Head (M/S SC-H). With the addition of a 74 AC 240 or two (as motor drivers) and a pair of motors, you can put together an interesting little light seeking, wheeled robot with peripheral vision.
  • As long as the light reaching the photo-bridge of the Master SC-H is balanced, then the Slave SC-H acts as a regular, lone SC-H would. So, if one of the slave photo-diodes detects more light then the other, the inverter that controls the motor on that side changes states and is now the same as the inverter of the Master SC-H tied to the same motor. This turns that motor off and the robot will pivot around the stopped wheel toward the greater light source until the light on each sensors is balanced and the motor again begins to turn.
  • I am also using SCar to continue experimenting with Stacking separate Sensor/Behavior circuits onto a robot. I will post more as progress is made.
  • ...9 more annotations...
  • The diodes between the  photo-diodes create a constant voltage drop between the inputs of the inverters. They cause  a dead band to exist between the thresholds of the two inverters. In a way they cause the circuit to act like a kind of window  comparator. Without these diodes both inverters would always be in the same state. With them, there is a small range where their outputs are in opposite states.
  • The Slave section has only two diodes (or one LED) between the photo-diodes. This makes it respond to smaller differences in light levels than does the Master part of the circuit
  • Basically, what I did was to stack one SC-H on top of another
  • I?m using a 74 HC 139 to direct the outputs of the M/S SC-H circuit to the appropriate motor(s)
  • Cheesy works very well. I?ve had fun making him chase a spot of light from a flashlight around on the floor. He has even been able to detect and react to the flashlight spot on the floor of the brightly lighted lab where I work.
    • York Jong
      York Jong on 03 Jun 07
       
      Stacking separate Sensor/Behavior
York Jong

Robot Room - Recommended books and periodicals - 0 views

www.robotroom.com/books.html

book electronics robot

shared by York Jong on 16 Jun 07 - Cached
  • York Jong on 16 Jun 07
     
    Hobbyist may have difficultly finding a book about electronics that doesn't contain too much mathematical or theoretical material. The books listed on this page are those that I found helpful, readable, and interesting.
York Jong

Reversing a motor without use of sensors - 0 views

www.solarbotics.net/...tutorials_nosensrevers.html

3star beam circuit electronics motor sensor theory

shared by York Jong on 27 May 07 - Cached
  • The motor is driven in either the forward or reverse direction, but will swap polarity if the motor encounters too sudden or great of a load
  • York Jong on 27 May 07
     
    The sensorless reversing circuit is used for driving one motor of a wheeled robot. The motor is driven in either the forward or reverse direction, but will swap polarity if the motor encounters too sudden or great of a load.
York Jong

74*240-based photopopper circuits - 0 views

library.solarbotics.net/...bot_popper_240.html

5star 74x240 beam circuit electronics maxibug photopopper phototrope robot

shared by York Jong on 27 May 07 - Cached
  • This adapted photodiode is not as sensitive as large area types so C2 may need to be reduced to 0.01uF while the value of R2 and R3 can be increased by a factor of 10.
  • Two leaded phototransistors can also be used but may require extra shielding to reduce light current in the bridge to acceptable levels
  • basic photopopper functions plus reverse -- all on a single chip
  • ...8 more annotations...
  • The monocore capacitor is for positive feedback for fast switching between the two motors and to slow down and avoid high frequency oscillations.
  • R2 together with C2 limits the maximum frequency of the monocore and motor drivers when the light is bright and the sensors are equally lit
  • R3 together with C2 sets the minimum frequency of the waggle even in the complete dark which is more interesting than twirling endlessly in a circle.
  • Having said that, maxibug is not perfect: it churns its wheels while feeding and does not back out of the feeding station when full. CD MaxiBug v5 uses just a few more parts but has powerful and efficient motor drivers, its motors are off while feeding, and it backs up when full.
  • The CD Maxibug v5 uses just one 74AC240 chip
York Jong

Robot Room - Intermediate Robot Building Book - 0 views

www.robotroom.com/IRB.html

book electronics mechanics robot

shared by York Jong on 09 Sep 07 - Cached
  • York Jong on 09 Sep 07
     
    Includes all of the step-by-step instructions you need to create your own robot that can explore rooms, follow lines, or battle opponents in mini sumo. The circuits and parts in this book are presented as independent modules, so that you can build the complete robot as described or apply the modules to your own unique robot designs.
York Jong

CAROLL: a Cheap Autonomous Robot for On-Line Learning - 0 views

www2.lifl.fr/...caroll.html

learning pic q-learning robot

shared by York Jong on 29 May 07 - Cached
  • The algorithm used here is a simple Q-learning algorithm
  • York Jong on 29 May 07
     
    This document describes the conception, building and programmation of a non-expensive autonomous wheeled robot, using as few electronic parts and special skills as possible. It makes use of a cheap but strong micro-controller, with enough program and data
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