Vending machine control with improved vendor selector switch det

Details Vending machine control with improved vendor selector switch det Vending machine control with improved vendor selector switch det

Filed on

1987-03-02

Date issued

1989-03-28

Examiner

Ruggiero, Joseph

Patent Class

Boots, shoes, and leggings

Other Related Categories

194217, 221 9, 34082535, 341 25, G06F 1520, G06F 704

Type

Patent

Status

active

Patent number

048170100

Description

ABSTRACT:
A vending machine control with an improved vendor selector switch detection and decoding circuit is described which detects and decodes the closure of selector switches in a vending machine utilizing a low cost decoding arrangement. Each selector switch is associated with a corresponding impedance in a keyboard network so that a unique impedance is presented on a keyboard decode line from the keyboard network. Decode circuitry and a decode algorithm are also disclosed for a period based decoding scheme which compensates for various tolerances and environmental affects.

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IBM Technical Disclosure Bulletin, vol. 14, No. 8, Jan. 1972, J. L. Holt & L. S. Rogers--Keyboard Using Elastic Diaphram Switches.

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