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Jinx escreveu:
> Added this page
>
> http://home.clear.net.nz/pages/joecolquitt/input_select.html
>
> Part of an ongoing project, hopefully will post the whole thing shortly
>
> wbr
>  =20

It is possible to give up the 74HC251 and achieve almost the same result
(each strobe pin reads six keys instead of eight).

You could use the pins that connect to D4 - D7, RS and R/W as inputs and
read six keys at once. If you have six keys or less, you don=B4t even nee=
d
a strobe pin.

If you ground the R/W pin, then it is possible to read five keys with
each strobe pin. The only pin that can=B4t be shared is the LCD EN pin.

Normally all the strobes are at high-impedance (it is good to pull them
up with a high value resistor). In this mode you can communicate with
the LCD in the normal way, forgetting the keys.

To read the keys, put all pins that connect to the LCD in
high-impedance, except for EN, which goes low. Then set the strobe pins
low one at a time (the others remain in high-impedance) and read the
multiplexed pins.

If you have six or less keys, then you don=B4t need a strobe, just connec=
t
the low side of the keys to ground.

Regards,

Isaac


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