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  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
  • Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard
Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard

Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard COD

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                        Description: 
                         
                        Can be inserted directly into Arduino uno mega2560, Ideal for linking up to your  Arduino 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:

                        Keypad 4 Button Key Module Switch Keyboard For Arduino UNO MEGA2560 Breadboard

                        Package includes:

                        1 x Keyboard


                        Arduino uno/mega2560 Code
                         
                        //******************************************************//
                         
                         
                        /*
                        Arduino_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);
                        }
                            
                         //******************************************************//

















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