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
$18.99
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

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

availability:In stock

Shipping: Free Airmail
Dispatch: Ships within 2-5 business days
Estimated Delivery: Between

$18.99

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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:

3 x 4 Key MCU Keyboard Matrix Button Board

More Detailed Photos:

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
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
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
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

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, United Arab Emirates 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

We accept payment through PayPal,and via credit card.

Paying with PayPal / Credit Card -

NOTE: Your order will be shipped to your PayPal address. Ensure you have selected or entered the correct delivery address.

1) Login To Your Account or use Credit Card Express.

2) Enter your Card Details the order will be shipped to your PayPal address. and click Submit.

3) Your Payment will be processed and a receipt will be sent to your email inbox.

Returns

You may return this item within 30 days of delivery for a full refund. We’ll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.

 

Product not working as expected?

Our Customer Service team are able to resolve most product related issues quickly and efficiently. For the support, please contact our team using the submission form on our Contact page.

 

Returns Eligibility

In order for a return to be eligible for a refund please ensure you return within 30 days from the delivery date of your item.

We kindly ask that you return your item to us in new or lightly used condition with no signs of worn out. If the item is in used condition, please send us the photo to confirm its condition before returning it. We reserve the right to refuse any return if there are any signs of worn out or if parts are missing.

Please be aware, we do cover the cost of the returns fees only if the return is a result of our error (you received an incorrect or defective item, etc.).

All customers should contact us before sending anything to us. We will not be responsible for returned item(s) without notifying us in advance.

 

Refunds

Following a successful inspection of your return we will process a full refund to the credit / debit card or PayPal account which was used to place the original order. 

You should expect to receive your refund within four weeks of returning your package, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 20 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (3 to 5 business days).

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