Case #83 William Played A Mean Game of Go Fish!
By Design News Staff -- Design News, April 23, 2006
Take down the house with this gadget. William's handheld controller provides the display of a monitored process deviation — but after hours it doubles as a card counter. (In either case, the algorithm is identical.) It works by adding or subtracting manually-entered "event" counts to a common 8-bit counter register. The value is subtracted from a predefined mean to generate the error or variation around the mean. This error "index" selects a display state sequence, continuously scheduled in an LED display. For William's complete instructions, click here.
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| Card Counter/Process Controller Parts List | ||
|---|---|---|
| Amt | Part Description | Allied Part # |
| 1 | Battery 2 AAA | 729-5173 |
| 1 | Battery holder Dual AAA | 839-9989 |
| 1 | Green LED | 782-0045 |
| 1 | Red LED | 782-0030 |
| 1 | 620V 0.25W resistor | 296-0039 |
| 1 | Momontary button right angle | 821-0330 |
| 1 | Button Cap black | 821-0391 |
| 1 | Header jumper | 518-0009 |
| 1 | Perf board .010-inch centers pads/2sides | 977-1250 |
| Additional parts required: 8-pin controller MicroChip/PIC12C508A; 1 header, 3 pin, 0.10-inch centers, right angle (Molex/22-288033); Hookup wire, 30ga/solid/insulated (OK Industries/KSW30WR-0100) | ||
For parts information, call (800) 433-5700, or go to www.alliedelec.com/gf.asp
For William Grill's complete instructions and microcontroller code to build a handheld card counter/process controller, click here.
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