20pcs 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
$42.39
20pcs 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

20pcs 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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$42.39

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Product Description

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:

20 x 4 Key MCU Keyboard Matrix Button Board


More Detailed Photos:

20pcs 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
20pcs 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
20pcs 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
20pcs 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

Additional Information

When you order from Alexnld.com, you will receive a confirmation email. Once your order is shipped, you will be emailed the tracking information for your order’s shipment. You can choose your preferred shipping method on the Order Information page during the checkout process. Alexnld.com offers 3 different international shipping methods, Airmail, Airmail registered and Expedited Shipping Service, following are delivery times:

Airmail and Airmail Registered Area Time
United States, Canada 10-25 business days
Australia, New Zealand, Singapore 10-25 business days
United Kingdom, France, Spain, Germany, Netherlands, Japan, Belgium, Denmark, Finland, Ireland, Norway, Portugal, Sweden, Switzerland 10-25 business days
Italy, Brazil, Russia 10-45 business days
Other countries 10-35 business days
Expedited Shipping 7-15 business days to Worldwide

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