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

Name: 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
Brand: Elecbee
SKU: EB0049264
Price: 8.99 USD
Availability: InStock
Rating: 141 / 29 (29 reviews)

$8.99

SKU: EB0049264

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

EB0049264

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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" );

{

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);

}

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

Package Included:

3 x 4 Key MCU Keyboard Matrix Button Board

Reviews (29)
comment

Q & A

: Where is the origin of Elecbee products? Are they certificated?

2023-03-03

Answer:

Elecbee has long-term cooperation agreements with the OEM factories in China. So that we are able to reduce the intermediate channel cost, and help you save money. Our products are all made strictly according to the relative global standard, to ensure the products have good compatibility and excellent quality.

2023-03-03

: What forms of payment do you accept?

2023-03-03

Answer:

Our main payment methods include Paypal, Credit Cards, Debit Cards, Bank Transfer, and more to discover. Please choose the payment methods in your favor.

2023-03-03

: When will you arrange shipment?

2023-03-03

Answer:

After confirming receipt of your payment. We will arrange the delivery as soon as possible and upload the courier number to the website for you to track.

2023-03-03

: How to exchange or return?

2023-03-03

Answer:

1. You can apply to return within 30 days after receipt of the goods. Please make sure the outside package is intact, and the product is in its original condition. We will arrange your refund according to the relevant provisions once the package is received.

2. Return process: You Apply for a Return - Approve the Return - Arrange a Return - Receive the Products and make Inspection - We arrange a Refund;

3. We will bear the freight charges for returns caused by us, for instance, the quality problem. As to returns caused by the buyer, the buyer should be responsible for the shipping fee.

2023-03-03