2pcs 4 Key MCU Keyboard Push Button Switch Matrix for UNO MEGA2560 DUE

2pcs 4 Key MCU Keyboard Push Button Switch Matrix for UNO MEGA2560 DUE

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Description:

Can be inserted directly into Arduiuo uno mega2560,Ideal for linking up to your Arduiuo UNO Pro Mini Nano Mega2560 Breadboard raspberry pi etc,or others MCU ( PLC AVR STM32 ARM PIC AT89C51 MSP430 STM8 Xilinx Altera Lattice FPGA CPLD etc.)

1 4-button Common Cathode key module .
2 " GND K1 K2 K3 K4" 4 PIN OUT 2.54mm
3? Working voltage: Can be DC 1.2V 1.8V 2.5V 3V 3.3V 4.5V 5V 9V 12V 24V 36V 48V
4 Size: 12.7MM x 33MM.

Arduiuo uno/mega2560 Code
//******************************************************//
/*Arduiuo_4key_uart
This example code is in the public domain.
*/
// Define key pin
int K1 = 13;
int K2 = 12;
int K3 = 11;
int K4 = 10;

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
// the setup routine runs once when you press reset:
void setup()

?{// initialize the keys pin as an input.
pinMode(K1, INPUT);
pinMode(K2, INPUT);
pinMode(K3, INPUT);
pinMode(K4, INPUT);
?
//Activate key pin internal pull-up resistors
digitalWrite(K1, HIGH);
digitalWrite(K2, HIGH);
digitalWrite(K3, HIGH);
digitalWrite(K4, HIGH);
?
// initialize serial communications at 9600 bps:
Serial.begin(9600);}

// the loop routine runs over and over again forever:
void loop() {buttonState = digitalRead(K1);
if(!buttonState)Serial.print("k1 \n" );
do{buttonState = digitalRead(K1);}
while(!buttonState);//Wait button release
?
buttonState = digitalRead(K2);
if(!buttonState)Serial.print("k2 \n" );
do{buttonState = digitalRead(K2);}
while(!buttonState);//Wait button release
?
buttonState = digitalRead(K3);
if(!buttonState)Serial.print("k3 \n" );
do{buttonState = digitalRead(K3);}

while(!buttonState);//Wait button release
buttonState = digitalRead(K4);
if(!buttonState)Serial.print("k4 \n" );
do{buttonState = digitalRead(K4);}

while(!buttonState);//Wait button release
delay(100);}
//******************************************************//

Packing list:1 PCS? 4 key push button switch Module;

GTIN: 774048924894

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