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York Jong

HackFurby.com - Furby Schematics - 0 views

www.hackfurby.com/schematic.html

3star calebchung circuit embedded furby robot schematics

shared by York Jong on 27 May 07 - Cached
  • York Jong on 27 May 07
     
    Through a lot of hard work by people other than myself, Furby's innner electronics have been fully reverse engineered. To the right is a rendering of the schematic created by Chris Brown. If you've got any corrections, I'm sure he'd be interested.
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

Ray's BEAM Bots -- BatteryVore - 0 views

raysbeambots.solarbotics.net/ivore.htm

battery batteryvore beam diy phototrope robot

shared by York Jong on 27 May 07 - Cached
  • It's simply a Phototropic BiCore driving two small motors
  • I had to add resistors across the motor leads to slow them down! I got this idea from Ben Hitchcock's Fred Troubleshooting Page -- "D) If the motor fires strongly once..."
  • York Jong on 27 May 07
     
    It's simply a Phototropic BiCore driving two small motors. -- a 74HCT240 chip with no motor driver. See the Schematic below.
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

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

Build this simple "electronic electroscope," a FET electrometer - 0 views

www.amasci.com/...chargdet.html

circuit electrometer electronics electrostatics fet mpf102

shared by York Jong on 30 May 07 - Cached
  • This simple circuit can detect the invisible fields of voltage which surround all electrified objects
  • ...9 more annotations...
  • The Gate acts as an antenna, so leave it unconnected.
  • The 1-meg resistor helps protect the FET from being harmed by any accidental sparks to its Gate lead. The circuit will work fine without this resistor. Just don't intentionally "zap" the Gate wire with a charged object or your charged finger.
  • To test the circuit, charge up a pen or a comb on your hair, then wave it close to the little "antenna" wire. The LED should go dark. When you remove the electrified pen or comb, the LED should light up again.
  • If you suspect that humidity is very high, test this by rubbing a balloon or a plastic object upon your arm. If the balloon does not attract your arm hairs, humidity is too high.
  • This FET sensor is not an ideal educational device because it responds differently to positive than to negative.
  • negative objects turn the LED off, it lights again when removed. positive objects make the LED bright, then dark when removed.
  • Obtain a small capacitor with a value below 100 picofarads. Connect it between the FET gate lead and one of the other FET leads (doesn't matter which one.) This greatly reduces the sensitivity of the device
  • Now make the circuit MORE sensitive. Obtain an alligator clip-lead, and connect it to the Gate lead of the FET. Let it hang loose without touching anything. You'll find that this has vastly increased the sensitivity of your FET circuit.
  • York Jong on 30 May 07
     
    This simple circuit can detect the invisible fields of voltage which surround all electrified objects. It acts as an electronic "electroscope.
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