Vending machine control with improved vendor selector switch detection and decoding apparatus
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United States of America Patent
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Mar 28, 1989
Grant Date -
N/A
app pub date -
Mar 2, 1987
filing date -
Mar 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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