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5*4 keypad controller or 20 Chanel Momentary controller

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sribangaram

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Dear Friends I need 5*4 keypad controller means 20 Chanel momentary mode controller circuit Please give me the suggestion :thinker::-?:|
 

KlausST

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Hi,

if you don´t find a ready to by controller, then you could do build one with a microcontroller or a PLD.

4 rows x 5 columns. 16 keys (and 16 diodes if you need to detec multiple pressed keys).

Klaus
 

sribangaram

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Friend that is 16 channel But I need 20 channel and I don't know Program writing I am newly Learning stage in C language I know compiling for hex generating Please cooperate to me :sad::sad:
 

milan.rajik

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Bettter use ADC keypad. It needs only one ADC pin connnection.
 

KlausST

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Hi,

Friend that is 16 channel But I need 20 channel and I don't know Program writing I am newly Learning stage in C language I know compiling for hex generating Please cooperate to me
yes, i know it is 16 channel. But i´m sure you can add a fifth row or column. That´s not difficult.

if you look for a keypad driver IC, then you hardly will find one exactely for 20 keys.

Klaus
 

sribangaram

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Friend didn't found Keypad driver ic for 20 channel what can i do I need momentary mode Any logic gate Ic's can support it ? 8-O:oops::-?:-?

- - - Updated - - -

Means 74154 are 4049
 

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