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York Jong

How to freeform the H-bridge - by Brian Hendrickson - 0 views

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

beam driver electronics h-bridge motor

shared by York Jong on 26 May 07 - Cached
  • York Jong on 26 May 07
     
    Most of us are familiar with Beckingham's photovore block (also known as Chiu's). The following is a similar format used for freeforming a simple H-bridge motor driver that can be used for walkers, heads, and any other project that uses motors that requir
York Jong

MetaCricket: A designer's kit for making computational devices - 0 views

www.research.ibm.com/...martin.html

5star cricket martin robot

shared by York Jong on 16 Jun 07 - Cached
  • All Cricket devices have a built-in bidirectional infrared communications channel, which is used for Cricket-to-desktop communication (when downloading programs to a Cricket, or viewing sensor data) and Cricket-to-Cricket communication.
  • Cricket Logo is based on an iterative, interactive model of project development. It includes a “command center” window; instructions typed into this window are instantaneously compiled, downloaded to a Cricket, and executed, giving the system the flavor of an interpreted software environment such as LISP, BASIC, or FORTH.
  • The MetaCricket software system is based on a virtual machine, written in PIC assembly language and running on the Cricket, and a compiler for the virtual machine running on a desktop development computer
  • ...13 more annotations...
  • It is straightforward to implement an interpreter-like interface, where user commands are transparently compiled, downloaded, and executed.
  • The Cricket virtual machine is burned into the PIC microprocessor's internal ROM
  • The user's code resides in a serial EEPROM
  • Built-in infrared communications routines include a protocol for reading and writing to this external EEPROM, and for asking the virtual machine to begin execution of byte codes already loaded into the EEPROM.
  • Users write programs for the Cricket in Cricket Logo, a dialect of Logo specialized for the Cricket virtual machine. Essentially, there is a one-to-one mapping between statements in Cricket Logo and primitive functions built into the virtual machine. This makes the implementation of the compiler far simpler than typical compilers.
  • The infrared protocol includes the following capabilities: Check that a Cricket is present and ready for other commands. Write a byte to the Cricket's EEPROM. Read a byte from the Cricket's memory. Begin program execution from a particular memory address.
  • we have found that a debugger is not necessary because of the interactive and incremental style of project development that occurs when using the Cricket.
  • The compiler includes an interactive mode—a text window where user expressions are compiled, downloaded, and executed in one step when the user presses the return key. A portion of the Cricket's memory is set aside for these dynamic programs.
  • User-level primitive functions compile to one, two, or three bytes of object code for the Cricket virtual machine.
  • The Cricket virtual machine has two process threads: a foreground process and a background daemon. In most Cricket programs, the foreground thread handles all the work, but for some tasks, the background daemon is valuable. For example, the background daemon can be used to instigate a periodic activity, or take action when some event occurs.
  • There are hardware-specific primitives for interacting with on-board Cricket hardware. Motor commands set state (on or off), direction, and power levels for each of the two integrated motor drivers. Analog sensor primitives (sensora and sensorb) return a value (0 to 255) for each of the two voltage inputs. These inputs also may be interpreted as digital values using the switcha and switchb primitives. There is a pair of primitive functions for generating tones on the piezo beeper: beep and note, the latter taking pitch and duration arguments.
  • there is a background millisecond timer that is updated every four milliseconds
  • One foreground thread plus one background daemon Daemon fires when provided Boolean expression makes false-to-true transition
York Jong

PHOTORESISTOR ALGORITHMS - 0 views

www.societyofrobots.com/rogramming_photoresistor.shtml

algorithm photoresistor photovore robot sensor

shared by York Jong on 14 Jun 07 - Cached
  • pseudocode: read left_photoresistor read right_photoresistor if left_photoresistor detects more light than right_photoresistor then turn robot left if right_photoresistor detects more light than left_photoresistor then turn robot right if right_photoresistor detects about the same as left_photoresistor then robot goes straight loop
  • Photovore Algorithm, Improved This algorithm does the same as the original, but instead of case-based it works under a more advanced Fuzzy Logic control algorithm. Your robot will no longer just have the three modes of turn left, turn right, and go forward. Instead will have commands like 'turn left by 10 degrees' or 'turn right really fast', and with no additional lines of code! pseudocode: read left_photoresistor read right_photoresistor left_motor = (left_photoresistor - right_photoresistor) * arbitrary_constant right_motor = (right_photoresistor - left_photoresistor) * arbitrary_constant loop
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  • Photovore, Split Brain Approach This algorithm works without comparison of photoresistor values. Instead, just command the right motor based on light from the right sensor, and the left motor with only data from the left sensor. You can also get interesting variations by reversing the sensors for a cross-brain algorithm. pseudocode: read left_photoresistor read right_photoresistor move left_wheel_speed = left_photoresistor * arbitrary_constant move right_wheel_speed = right_photoresistor * arbitrary_constant loop
  • York Jong on 14 Jun 07
     
    The photovore is a robot that chases light, and is perhaps the simplest of all sensor algorithms. If you are a beginner, this should be your first algorithm.
York Jong

BEAM Circuits -- 74*24x-based motor drivers compared - 0 views

library.solarbotics.net/...driver_24x_comp.html

3star beam comparison driver electronics ic motor

shared by York Jong on 27 May 07 - Cached
  • In many ways, both the 74*240 and 74*245 are equally handy for BEAM use; both have 20 pins, and so the main difference that most folks will care about is that one inverts drive inputs, while the other doesn't. Out of curiousity, I decided to torture test the two chips to see how they compared under load.
York Jong

Chiu-Yuan Fang's BEAM Walker Page - 0 views

www.geocities.com/...walk3.html

beam electronics robot walker

shared by York Jong on 26 May 07 - Cached
  • York Jong on 26 May 07
     
    Three motor designs are much more able walkers with longer strides and very tall steps. They are also a huge jump in construction complexity from a two motor walker. Walker Ver3.0 is controlled by a six-neuron nervous net. I opted not to go with the 4 neu
York Jong

ROBOT GEARS TUTORIAL - 0 views

www.societyofrobots.com/mechanics_gears.shtml

gear mechanics robot tutorial

shared by York Jong on 31 May 07 - Cached
  • motors commercially available do not normally have a desirable speed to torque ratio (the main exception being servos and high torque motors with built in gearboxes)
  • With gears, you will exchange the high velocity with a better torque.
  • the larger gear will move more slowly than the smaller gear, but it will move with more torque.
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  • Suppose your gearing ratio is 3/1. This would mean you would multiple your torque by 3 and your velocity by the inverse, or 1/3.
  • York Jong on 31 May 07
     
    No good robot can ever be built without gears. As such, a good understanding of how gears affect parameters such as torque and velocity are very important.
York Jong

Maxibug, Minibug, Microbug - 0 views

home.wanadoo.nl/...maxibug.htm

5star 74x14 beam circuit diy electronics maxibug photopopper phototrope photovore robot tutorial

shared by York Jong on 27 May 07 - Cached
  • It is powered with two 3.3F Goldcaps. They can be charged in a few seconds. When they are charged, MAXIBUg gets "afraid" of light, and wanders of to go to play "in the dark". After a while, about 20 seconds (depending on the current used by the two motors ), the power has dropped, and it wants to "eat". It gets light attracted, and will turn and go to the light. When it gets there, it will recharge and still will be atrackted to the light until it reaches a trigger voltage , at which it gets "afraid"of the light again. This will go on all day until someone turns off the lightsource. While doing all this it also will backup when bumping into something.
  • Because of the "on-off" output of the first schmitt trigger, the inputs for the LDRs will switch. That's why it gets light atracted -light afraid. This also means that you cannot use IR diodes (like SHF205). You have to use LDRs !
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  • The change in output is visualised with two red LEDs. When the LEDs are burning, the bot is "afraid" of light. They are mounted as eyes off the bot, that's why I used two off them. One LED will do also, but doesn't look nice !
York Jong

Building Sensors and Motors for the Red and Blue Dot Crickets - 0 views

llk.media.mit.edu/...index.html

diy electronics mit solder wiring

shared by York Jong on 31 May 07 - Cached
  • York Jong on 31 May 07
     
    This document explains how to interface a variety of devices to the Red Dot Cricket:
York Jong

Robot Room - IRB and Roundabout Resourcess - 0 views

www.robotroom.com/IRBGoodies.html

book errata robot

shared by York Jong on 09 Sep 07 - Cached
  • "Exposing a Flaw: Shoot-Through" describes the serious problem with that circuit, especially when pulsed
  • Above is an improved version of the circuit, which is now PWM compatible. PWM, coast mode, and the capability to avoid shoot-through are provided by adding a fifth MOSFET (labeled Q5) to the source/ground connections of Q1 and Q3.
  • ...1 more annotation...
  • By default at power-up, the circuit is in coast mode. To brake, set IN A to 0 V, IN B to 0 V, and Q5 to 5 V. To spin clockwise, set IN A to 5 V, IN B to 0 V, and Q5 to 5 V. To spin counterclockwise, set IN A to 0 V, IN B to 5 V, and Q5 to 5 V. At any time you can return to coast by applying 0 V to Q5. Or, you can apply pulses of 0 V/5 V/0 V/5 V (and so on) to control the speed. The more time spent at 5 V, the faster the motor will spin. Whenever you change modes, if you set Q5 to 0 V before making changes to IN A and IN B (and then set Q5 back to 5 V or pulsing) there will be no shoot-through.
  • York Jong on 09 Sep 07
     
    This secret page is for owners of the book, Intermediate Robot Building. On this page, you'll find updates, corrections, and source files. Thank you for buying the book!
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

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

Robotics, Mechatronics, and Artificial Intelligence - 0 views

books.google.com/books

book choice electronics robot toread

shared by York Jong on 09 Sep 07 - Cached
  • York Jong on 09 Sep 07
     
    this book simplifies the process of finding basic circuits to perform simple tasks such as how to control a DC or step motor, and offers instruction on creating moving robotic parts such as an eye or an ear.
York Jong

Getting Started With Crickets - 0 views

llk.media.mit.edu/...getting_started.html

cricket logo robot tutorial

shared by York Jong on 09 Sep 07 - Cached
  • the Cricket's yellow LED flashes when the Cricket is sending infrared signals.
  • You can type any Cricket Logo instruction in the Cricket Logo Command Center, and it will be immediately transferred to the Cricket and executed.
  • ...3 more annotations...
  • the Cricket's green LED light goes on while the Cricket is executing commands.
  • You can "launch" a procedure directly from the Cricket by pressing the white button on the Cricket.
  • You can send information from the Motor/Sensor Cricket back to the computer using the send instruction.
York Jong

Furby Schematics - 0 views

mechatronics.mech.northwestern.edu/...Furby_schematics.html

5star calebchung circuit embedded furby robot schematics

shared by York Jong on 27 May 07 - Cached
  • Note that the resistor value of the pull-down resistor affects the voltage at pin 3 of the Furby's connector. We used a 1k ohm resistor to make it less sensitive to light (since we're now operating with it open to ambient light).
  • In the above diagram, a 20k ohm resistor is used as the pull-up resistor. You can, however, use any resistor as the pull-up resistor as long as the resistance is high enough to protect the circuit.
  • York Jong on 27 May 07
     
    There are a number of sensors and a motor driver on the Furby. The following is a list of these sensors and their functions.
York Jong

Building Sensors and Motors for Handy Board - 0 views

www.handyboard.com/sensors

diy electronics hardware mit robot sensor solder wiring

shared by York Jong on 31 May 07 - Cached
  • York Jong on 31 May 07
     
    This document explains how to interface a variety of devices to the Handy Board:
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