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 .
|Card Counter/Process Controller Parts List|
Allied Part #
|1||Battery 2 AAA||729-5173|
|1||Battery holder Dual AAA||839-9989|
|1||620V 0.25W resistor||296-0039|
|1||Momontary button right angle||821-0330|
|1||Button Cap black||821-0391|
|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 .