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To speed up the home page, the projects and events on this page
have been moved from the main home page.|
Second-Generation Combination Tachometer|
To display RPMs on 4-inch tall LEDs, the original digital tachometer circuit needed to be redesigned. A comparator was successfully included along with a canned oscillator, quad-tach mode, and adjustable overheat temperature setting.
Finding the Center of a Circle|
There's a simple method for finding the center of a square, circle, or octagon. The technique is useful if you're making your own wheels. Two lines drawn at a 45-degree angle to two different sides will cross in the center. Perhaps the described tool and pictures will make it clearer.
Homemade Double-Sided Printed Circuit Board|
After learning how to make a single-sided board, creating a double-sided PCB takes nothing more than a little careful alignment and some through-hole soldering. The example board is two-sided copper with components and DIP sockets on one side.
Homemade Surface-Mount Component Printed Circuit Board|
Surface-mount components are now the mainstay of the electronics industry. The ability to create a board for these packages is important to anyone wishing to access the latest and greatest technologies.
LEGO MindStorms Crown Gears|
There are at least three variations of the LEGO 24-tooth crown gears. Watch out that you don't accidentally mismatch pairs!
N-Size Rechargeable Battery|
Information about an N-size nickel-metal hydride (NiMH) rechargeable battery. The small size and ability to be recharged makes this cell perfect for a very small robot.
Parallax Boe-Bot Robot|
A review of a well-engineered commercial robot kit for hobbyists and students.
LEGO MindStorms Chipmunk Chaser Robot|
Snapshots and some design notes of a robot built with LEGO MindStorms bricks.
Infrared Transmitter Project|
The heart of this project is a NAND gate turned into a 40-kHz oscillator. A simple 9-volt to 5-volt regulator circuit schematic is also included.
AMP Hexadecimal Switch|
Details and a sample schematic for a rotary switch with 16 positions that encodes its output as 4 SPDT switches.
PLL Clock Generation|
The 68HC08 family of microcontrollers has a built-in phase-locked loop that can generate various bus clock speeds from an inexpensive 32.768 kHz crystal. This project shows you how to build the oscillator and connect it to an MC68HC908GP32. Includes schematics and source code.
Bugs With P&E Microcomputer Systems ICS08GP Assembler|
I've encountered a few bugs with the free assembler for the 68HC08GP20 and 68HC08GP32 microcontrollers. Here are the emails and source code I sent to the developers and the workarounds I'm using.
Twofold I - 68HC908GP32 Robot|
A peek at one of my incomplete robots. Designed around an MC68HC908GP32 microcontroller and featuring a 4-line 20-character LCD display.
CIRC Sumo Robot Contest 2000|
The Central Illinois Robotics Club hosted a Sumo robot contest on November 5th, 2000. Bill Harrison announced and judged the matches. Home movies, photos, and a description of the event are posted.
|Droolingly fascinating site history.|