2pcs 4 Key MCU Keyboard Matrix for Arduino MEGA2560 DUE Button Banana Pi Breadboard Switch FPGA CPLD STM32
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2pcs 4 Key MCU Keyboard Matrix for Arduino MEGA2560 DUE Button Banana Pi Breadboard Switch FPGA CPLD STM32
$11.03
Sale price
$11.03
Regular price
$0.00
Description
SPECIFICATIONS
Application: MCU
Brand Name: eletechsup
Choice: yes
Condition: New
Dissipation Power: 0.001
High-concerned chemical: none
Operating Temperature: -30-80
Origin: Mainland China
Supply Voltage: 3-12V
Type: Module
is_customized: Yes
semi_Choice: yes
Packing list(Does not include UNO R3):
2 PCS 4 key push button switch;
Description:
Can be inserted directly into Arduiuo uno mega2560 due,Ideal for linking up to your Arduiuo UNO Mini Nano Mega2560 Breadboard raspberry pi banana pi etc,or others MCU PLD CPU ( AVR STM32 ARM PIC C51 NRF24LE1 CC2530 MSP430 STM8 FPGA CPLD etc.)
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: 12.7MM x 33MM.
Arduiuo uno/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 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 :
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30-Day Return Policy
- Returns: 30-day hassle-free return window
- Condition: Items must be unused and in original packaging
- Refund: Full refund processed within 3-5 business days
Why Choose Us?
- Factory Direct: ISO/TS 16949 certified manufacturer
- Quality: 100% electrical continuity tested before shipment
- Experience: 15+ years in automotive connector industry
- Support: Professional technical support available
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