Product Name: Tb371 8pcs Universal Dc 0-48v 4 Keyboard Button Switch Module For Due Breadboard Leonardo Zero Tre Micro Banana Pi Zigbee
Packing list(Does not include UNO R3 Board):
8 PCS 4xkey push button switch module,
Description:
Can be inserted directly into Arduiuo uno mega2560 due Leonardo ZERO,Ideal for linking up to your Arduiuo DUE UNO Pro Mini Nano Mega2560 Breadboard raspberry pi banana pi etc,or others MCU PLD CPU ( AVR STM32 ARM PIC C51 Zigbee NRF24LE1 CC2530 MSP430 STM8 FPGA CPLD etc.)
1 4-button Common Cathode botton board(When pressed button, output low level).
2 '' GND K1 K2 K3 K4'' 4 PIN OUT 2.54mm Pin Header
3Working voltage: DC 0-48V(Can be DC 1.8V 2.5V 3.3V 5V 12V 24V 36V 48V)
4 Size: 12.7MM x 33MM.
Arduiuo uno/mega2560/
Leonardo
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 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),
}
//******************************************************//
Circuit schematics :