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2.54mm Female Key board Raspberry pi Development Board Keypad FPGA CPLD ARM AVR

2.54mm Female Key board Raspberry pi Development Board Keypad FPGA CPLD ARM AVR

$3.48 USD
$3.48 USD $3.48 USD
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Raspberry pi key board
Development Board Keypad
FPGA Key CPLD Key ARM Key AVR Key
 
 
 
 
 
 
Packing list:
 
1 PCS  4-button modules
 
 
 
 
 
 
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.) 
   
 
 
1 4-button Common Cathode key module .
 
 
2 " GND K1 K2 K3 K4" 4 PIN OUT  2.54mm
 
 
3 Size: 12.7MM x 33MM.
 
 
 
 
Circuit schematics : 
 
 
 
 
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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