Hex keypad

262

03:42:44

Yes! Finally got EC updated on iOS. No more 'shorting' out push button latches with my fat finger :) :)

published 10 years ago

NICK343

10 years ago

How exactly does this keypad work, if you don't mind me asking?

roops1967

10 years ago

Using lamps as pull down resistor for the push buttons, OR gates to demux into binary, the counter ic for latching . Also more OR gates to check any keypress to clock(load) the counter(latch) ic. Try simplifying by deleting the left 2 7seg displays with its driver and counters, might be easier to follow then

roops1967

10 years ago

The 4x7 rows of OR gates used for converting the keypress to binary. The 3 OR gates in a column next to keypad are to load the latch if any input, and OR gate above keypad to check if zero is pressed. Hope that makes a little more sense

Karma247

10 years ago

Excellent

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