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3pcs TB371 4 Key MCU Keyboard Button Board Compatible UNO MEGA2560 Pro Mini Nano Due for Raspberry Pi Teensy++ Geekcreit for Arduino – products that work with official for Arduino boards

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                  Description:
                    
                  1. 4-button Common Cathode key module(When pressed output low level). 
                  2. GND K1 K2 K3 K4" 4 PIN OUT  2.54mm
                  3. Working voltage: DC 0-48V 
                  4. Size: 12.7 x 33mm
                  5. It can be inserted directly into Arduiuo uno3 mega2560 due, for linking up to your  Arduiuo uno3 Mini Nano Mega2560 Breadboard for raspberry pi banana pi  etc,or others MCU PLD CPU ( AVR STM32 ARM PIC C51 NRF24LE1 CC2530 MSP430 STM8 FPGA CPLD etc.)

                  Circuit schematics:

                  Arduiuo uno3/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
                  // 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);
                  }
                      

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

                  Package Included:

                  3 x 4 Key MCU Keyboard Matrix Button Board


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