20pcs Keypad 4 Button Key Module Switch Keyboard For UNO MEGA2560 Breadboard

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$24.99

Ex Tax: $24.99

Stock: In Stock
Model: EB0049372
SKU: EB0049372

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Description:

Can be inserted directly into uno mega2560, Ideal for linking up to your UNO Mini Nano Mega2560 Breadboard etc, or others MCU ( AVR STM32 ARM PIC AT89C51 STC MSP430 STM8 FPGA CPLD etc.)

4-button Common Cathode key module

GND "K1 K2 K3 K4" 4 PIN OUT 2.54mm

Size: 12.7MM x 33MM.

Circuit schematics:

20pcs-Keypad-4-Button-Key-Module-Switch-Keyboard-For-UNO-MEGA2560-Breadboard-1590012

Package includes:

20 x Keyboard

uno/mega2560 Code

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

_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" );

{

buttonState = digitalRead(K1);

}

while(!buttonState);//Wait button release

buttonState = digitalRead(K2);

if(!buttonState)Serial.print("k2 n" );

{

buttonState = digitalRead(K2);

}

while(!buttonState);//Wait button release

buttonState = digitalRead(K3);

if(!buttonState)Serial.print("k3 n" );

{

buttonState = digitalRead(K3);

}

while(!buttonState);//Wait button release

buttonState = digitalRead(K4);

if(!buttonState)Serial.print("k4 n" );

{

buttonState = digitalRead(K4);

}

while(!buttonState);//Wait button release

delay(100);

}

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

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Shipping Method Shipping Rates Shipping Times
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Tags: Keyboard