help regarding alpha numeric keypad

[harish.n.j]

Hi all,
am planning to use alphanumeric keypad for my project, i tried different algorithm but it don seems to be working.

Am planning to use 4X4 keypad.

get alphabets in a way as we use mobile keypad in writing SMS in dictionary off mode.
for eg if 2 button is pressed once its 'a',twice 'b',three times 'c'

does anyone worked on this, can u help me on this

 

[bobcat1]

Hi

the easy way is to use a keypad controller like the max7360

All the best

Bobi

The microcontroller specialist

 

[harish.n.j]

Thanks Bobcat1 ,
but i would like to achieve this by pure c coding. do u have any idea how to do it by coding

more over i was trying to mean the regular mobile keypad (4X3) , which has 1 - 9,*,0,#

 

[nikhilele]

Even I am going to start the same... code.. may be today or tomorrow i will start.. once its completed i will upload.. it...
logic is...
first u write normal keyscan code...
in this code add one more delay as u r adding debounce delay we will call it "recur delay=500ms"
if same key is pressed in before this is over then instead of numeric code it start with alpanumeric code eg if digit 2 is
pressed once then code is "2"
if pressed twice then code is "a"
if pressed twice then code is "b"
if pressed twice then code is "c"

 

[harish.n.j]

Thanks nikile , i have came across many algorithm for this but i tried n couldn succeed hence if u succeed do inform me too... thanks in advance !

 

[fouwad]

yeah i need it too
so plz if u do successfully complete this code kindly upload it
thanx

 

[nikhilele]

ok i will do it for you...
within a week you check the post you will get the code...

 

[nikhilele]

Code for alpha but not numeric keypad

hi friends..
I have done small modification as per my required you can change the code
each key can be used to provide one of three input

	        0- {' ','.',','},     #Space Dot comma
		1- {'A','B','C'},
		2- {'D','E','F'},
		3- {'G','H','I'},
		4- {'J','K','L'},
		5- {'M','N','O'},
		6- {'P','Q','R'},
		7- {'S','T','U'},
		8- {'V','W','X'},
		9- {'Y','Z','@'},

if somebody wants to add numeric then instead of 3 column in each row you add one more char as i have shown below

1- {'A','B','C','1'},
2- {'D','E','F','2'},

and change n==3 by n==4 in the code

Enjoy...

pasword is my ID

 

[srinu249]

Yes i too doing the same keypad in my PIc project..

i not yet started .. but i worked on normal keypad...

Now only the thing is .. if we press same key within a short time span it should read one more alhanumeric no..


eg: Press S2 : it show 2
within 2sec S2 has to repress then it should show 'A'
again repress 'B' , again repress 'C' ..then 2 again.. same sequence continuous...


so we should implement this logi in the code..


i hope u got my idea...

any way i am going to do it..

bye
SRINu

 

[fatimanm92]

I need help regarding alphabetic keypad code.. plzzzzzz!!!!