In this Design Idea, an old technique of diode-based 16-to-4 encoding is combined with a new design, to scan a record number of buttons – 74 – with only four I/O pins! First start with the ancient ...
Encoders and decoders are common elements in alarm, remote-control, and measurement systems. However, most of these devices require many I/O lines when under microprocessor or PC control. For example, ...
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