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Elecbee 20pcs Keypad 4 Button Key Module Switch Keyboard For UNO MEGA2560 Breadboard
SKU: EB0049372
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Key Features
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Description
Description:
Can be inserted directly into uno mega2560, Ideal for linking up to your 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:
20 x Keyboard
20 x Keyboard
uno/mega2560 Code
//******************************************************//
/*
_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);
}
//******************************************************//
Shopping Guide
Shipping | Delivery Period | For in-stock parts, orders are estimated to ship out in 3 days. Elecbee ships orders once a day at about 5pm except Sunday. Once shipped, estimated delivery time depends on the below carriers you chose. DHL Express: 3-7 business days DHLeCommerce: 12-22 business days FedEx International Priority: 3-7 business days EMS: 10-15 business days Registered Air Mail: 15-30 business days | |
| Shipping Rates | Shipping rates for your order can be found in the shopping cart. | ||
| Shipping Options | Shipping rates for your order can be found in the shopping cart. | ||
| Shipping Tracking | We will notify you by email with tracking number once order is shipped. You can track your order using the “Track My Order” feature. | ||
| Returning/Warranty | Returning | Returns are normally accepted when completed within 30 days from date of shipment, please contact customer service for a return authorization. Parts should be unused and in original packaging. Customer has to take charge for the shipping | |
| Warranty | All Elecbee purchases come with a 30-day money-back return policy, plus 1-year Elecbee warranty against any manufacturing defects. | ||
| This warranty shall not apply to any item where defects have been caused by improper customer assembly failure by customer to follow instructions, product modification, negligent or improper operation | |||
| Ordering | How to Buy | Elecbee accepts online orders. | |
| Add to cart > Check out > Submit order > Complete payment > Delivery | |||
| Payment | PayPal, Credit Card includes Visa, Master, American Express, Bank transfer. | ||
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In-Stock:9999
Qty.
1
Unit Price
$ 21.24$ 24.99
Ext. Price
$ 21.24$ 24.99
$ 21.24$ 24.99
Can Ship in 1-3 Business Days