Membrane 5x4 Keypad คีย์แพดแบบฟังก์ชัน สำหรับบอร์ด Arduino ESP8266 ESP32

Features:
Matrix 20 key Membrane
Pad Size:75mm(L)*85mm(W)
Total Length: 180mm
Connector: Dupont 9 pin
โค้ดต้วอย่าง
227 lines (206 sloc) 4.88 KB


/******************************************************
4x5 keyboard matrix

By Chris Rouse April. 2016

Connect:
Row 1 to Arduino pin 2
Row 2 to Arduino pin 3
Row 3 to Arduino pin 4
Row 4 to Arduino pin 5
Row 5 to Arduino pin 6

Column A to Arduino pin 8
Column B to Arduino pin 9
Column C to Arduino pin 10
Column D to Arduino pin 11

Key values with connector at top

4 9 14 19
3 8 13 18
2 7 12 17
1 6 11 16
0 5 10 15

Connector (from left to right with keys facing up, connector at top):

Columns Rows
X X X X X X X X X
A B C D 1 2 3 4 5

(Rows link keys from left to right,
columns link keys from top to bottom)

****************************************************/

int rowCounter =0; // row counter
int columnCounter =0; // column counter
int foundColumn = 0;
boolean foundCol = false;
int keyValue = 0;
int noKey = 0;
boolean readKey = false;
int debounce = 300; // set this to the lowest value that gives the best result
String keyString;
int keyNum; // used for numeric keys
boolean numericValue = false; // flag to show if number selected

const int row1 = 2;
const int row2 = 3;
const int row3 = 4;
const int row4 = 5;
const int row5 = 6;
const int colA = 8;
const int colB = 9;
const int colC = 10;
const int colD = 11;

const int ledPin = 13; // onboard LED

void setup(){
Serial.begin(9600);
pinMode(row1, OUTPUT);
pinMode(row2, OUTPUT);
pinMode(row3, OUTPUT);
pinMode(row4, OUTPUT);
pinMode(row5, OUTPUT);
pinMode(colA, INPUT_PULLUP);
pinMode(colB, INPUT_PULLUP);
pinMode(colC, INPUT_PULLUP);
pinMode(colD, INPUT_PULLUP);
//
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW); // turn LED off
}

void loop(){
if(noKey == 20){ // no keys were pressed
readKey = true; // keyboard is ready to accept a new keypress
}
noKey = 0;
for(rowCounter=row1; rowCounter(row5 +1); rowCounter++){
scanRow(); // switch on one row at a time
for(columnCounter = colA; columnCounter 1; columnCounter++){
readColumn(); // read the switch pressed
if (foundCol== true){
keyValue =(rowCounter-row1) +5*(columnCounter - colA);
}
}
}
if(readKey==true noKey == 19){ // a key has been pressed
convertKey(); //convert key number to keypad value
//
// used for debug
Serial.print(keyValue);
Serial.print(" - ");
Serial.println(keyString);
//
if (keyValue == 15){
digitalWrite(ledPin, !digitalRead(ledPin)); // toggles LED ON/OFF
}
else{
digitalWrite(ledPin, LOW);
}
//-------------------------------------------------------
// call to part of the sketch that will use the key number





//-------------------------------------------------------

readKey = false; // reset the flag
delay(debounce); // debounce
}
}
/************************************************************/
void scanRow(){
for(int j =row1; j (row5 +1); j++){
digitalWrite(j, HIGH);
}
digitalWrite(rowCounter , LOW); // switch on one row
}
/************************************************************/
void readColumn(){
foundColumn = digitalRead(columnCounter);
if(foundColumn == 0){
foundCol = true;
}
else{
foundCol=false;
noKey=noKey +1; // counter for number of empty columns
}
}
/************************************************************/
void convertKey(){
// converts the key number to the corresponding key
keyString ="";
keyNum = 99;
numericValue = false;
//
switch (keyValue) {
// column A
case 0:
keyString = "Left Arrow";
break;
case 1:
keyString = "7";
keyNum = 7;
break;
case 2:
keyString = "4";
keyNum = 4;
break;
case 3:
keyString = "1";
keyNum = 1;
break;
case 4:
keyString = "F1";
break;
// column B
case 5:
keyString = "0";
keyNum = 0;
break;
case 6:
keyString = "8";
keyNum = 8;
break;
case 7:
keyString = "5";
keyNum = 5;
break;
case 8:
keyString = "2";
keyNum = 2;
break;
case 9:
keyString = "F2";
break;
// column C
case 10:
keyString = "Right Arrow";
break;
case 11:
keyString = "9";
keyNum = 9;
break;
case 12:
keyString = "6";
keyNum = 6;
break;
case 13:
keyString = "3";
keyNum = 3;
break;
case 14:
keyString = "#";
break;
// column D
case 15:
keyString = "Ent";
break;
case 16:
keyString = "Esc";
break;
case 17:
keyString = "Down Arrow";
break;
case 18:
keyString = "Up Arrow";
break;
case 19:
keyString = "*";
break;
}
if (keyNum == 99){
numericValue = false; // show a non numeric key pressed
}
else{
numericValue = true; // show a number key pressed
}
}
/************************************************************/

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