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| == SCH ==
| | https://w2.electrodragon.com/gollum/search?q=keypad-dat.md |
| <gallery>
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| File:Keypad_sch_01.png | Kaypad SCH 01
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| </gallery>
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| | |
| | |
| === Demo code ===
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| | |
| <syntaxhighlight lang="Arduino">
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| /* @file CustomKeypad.pde | |
| || @version 1.0
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| || @author Alexander Brevig
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| || @contact alexanderbrevig@gmail.com
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| ||
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| || @description
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| || | Demonstrates changing the keypad size and key values.
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| || #
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| */
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| #include <Keypad.h>
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| | |
| const byte ROWS = 4; //four rows
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| const byte COLS = 4; //four columns
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| //define the cymbols on the buttons of the keypads
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| char hexaKeys[ROWS][COLS] = {
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| {'0','1','2','3'},
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| {'4','5','6','7'},
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| {'8','9','A','B'},
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| {'C','D','E','F'}
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| };
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| byte rowPins[ROWS] = {7, 6, 5, 4}; //connect to the row pinouts of the keypad
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| byte colPins[COLS] = {11, 10, 9, 8}; //connect to the column pinouts of the keypad
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| | |
| //initialize an instance of class NewKeypad
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| Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
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| | |
| void setup(){
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| Serial.begin(9600);
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| }
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|
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| void loop(){
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| char customKey = customKeypad.getKey();
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|
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| if (customKey){
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| Serial.println(customKey);
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| }
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| }
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| | |
| </syntaxhighlight>
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| | |
| ====Updated Demo Code 2013-05-24 ====
| |
| We have tested with library on 4X4 keypad, but there is some thing need to change.Please follow the steps.<br />
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| * Download this [[:File:Keypad.zip|library]], and it's refer to this arduino page.
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| * Use the example called "custom keypad" in the menu
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| * switched the pins, pin 1 connect to the keypad will make one row or one column not work out. so let's change all the wirings from 1-4 and 5-7 to 5-7 and 8-11.
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| * Always try to avoid pin 1, in other keypad version.
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| | |
| | |
| === Pin Definitions ===
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| VCC Row 1, 2, 3, 4<br />
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| NC Column 1, 2, 3, 4<br />
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| <br />
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| Output high TTL signal when either row or column buttons are pressed.<br />
| |
| === Demo code ===
| |
| * Same demo code for arduino can be found [[Membrane_4*4_button_pad|here]].
| |
| <syntaxhighlight lang="c">
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| #include<reg51.h>
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| #define uchar unsigned char
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| #define uint unsigned int
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| //sbit key1=P3^4;
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| //sbit key2=P3^5;
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| //sbit key3=P3^6;
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| //sbit key4=P3^7;
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| uchar code table[]={
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| 0x3f,0x06,0x5b,0x4f,
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| 0x66,0x6d,0x7d,0x07,
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| 0x7f,0x6f,0x77,0x7c,
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| 0x39,0x5e,0x79,0x71,
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| };
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| uchar num,temp;
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| void delay (uint z)
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| {
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| uint x,y;
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| for(x=z;x>0;x--)
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| for(y=110;y>0;y--);
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| }
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| void main ()
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| {
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| num=1;
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| while(1)
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| {
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| P3=0xfe;// low TTL on first row
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| temp=P3;//扫面P3口的数据，送给temp
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| temp=temp&0xf0;//扫描是否有按键按下，如果有则temp的高四位肯定有一位是0.
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| while(temp!=0xf0)
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| {
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| delay(5);//消抖
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| temp=P3;//再次读P3口的数据
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| temp=temp&0xf0;
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| switch(temp)
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| {
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| case 0xee: num=1;break;
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| case 0xde: num=2;break;
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| case 0xbe: num=3;break;
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| case 0x7e: num=4;break;
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| default: break;
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| }
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| temp=temp&0xf0;
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| }
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| }
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| }
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| P1=table[num-1];
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|
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| | |
| P3=0xfd;//将第二行电平拉低
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| temp=P3;//扫面P3口的数据，送给temp
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| temp=temp&0xf0;//扫描是否有按键按下，如果有则temp的高四位肯定有一位是0.
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| while(temp!=0xf0)
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| {
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| delay(5);//消抖
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| temp=P3;//再次读P3口的数据
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| temp=temp&0xf0;
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| switch(temp)
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| {
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| case 0xed: num=5;break;
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| case 0xdd: num=6;break;
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| case 0xbd: num=7;break;
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| case 0x7d: num=8;break;
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| default: break;
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| }
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| temp=temp&0xf0;
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| }
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| }
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| }
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| P1=table[num-1];
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|
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|
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| P3=0xfb;//将第三行电平拉低
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| temp=P3;//扫面P3口的数据，送给temp
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| temp=temp&0xf0;//扫描是否有按键按下，如果有则temp的高四位肯定有一位是0.
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| while(temp!=0xf0)
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| {
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| delay(5);//消抖
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| temp=P3;//再次读P3口的数据
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| temp=temp&0xf0;
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| switch(temp)
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| {
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| case 0xeb: num=9;break;
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| case 0xdb: num=10;break;
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| case 0xbb: num=11;break;
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| case 0x7b: num=12;break;
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| default: break;
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| }
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| temp=temp&0xf0;
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| }
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| }
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| }
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| P1=table[num-1];
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|
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| | |
| P3=0xf7;//将第四行电平拉低
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| temp=P3;//扫面P3口的数据，送给temp
| |
| temp=temp&0xf0;//扫描是否有按键按下，如果有则temp的高四位肯定有一位是0.
| |
| while(temp!=0xf0)
| |
| {
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| delay(5);//消抖
| |
| temp=P3;//再次读P3口的数据
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| temp=temp&0xf0;
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| switch(temp)
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| {
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| case 0xe7: num=13;break;
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| case 0xd7: num=14;break;
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| case 0xb7: num=15;break;
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| case 0x77: num=16;break;
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| default: break;
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| }
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| while(temp!=0xf0)
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| {
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| temp=P3;
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| temp=temp&0xf0;
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| }
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| }
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| }
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| P1=table[num-1];
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| | |
| }
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| }
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| | |
| </syntaxhighlight>
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| === Documents===
| |
| * [[:File:Key_header.zip|8051 key header file]].
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| [[category:input]]
| |