SKU: OT2085-B118 Artikelnummer: NA171 EAN: 8126478667001
Knappsats med plastknappar. Perfekt till exempel för att mata in en åtkomstkod.
Knappsatsen har membranbrytare och alla knappar är numrerade 0-9, samt tecknen * och #. Till höger finns ytterligare 4 knappar med A,B,C och D
Modulen är mycket lämplig för inbyggnad. På modulen finns också fyra 2mm hål för montering.
Mått
Längd: 6,9cm
Bredd: 6,5cm
Höjd: 1cm
Så här kopplar du 4x4 matris-knappsats svart till en Arduino UNO eller ESP32, med ett exempelsketch som du kan ladda upp direkt.
This project demonstrates how to read inputs from a 4x4 matrix keypad using an Arduino Uno. When any button on the keypad is pressed, the corresponding character is printed directly to the Serial Monitor at 115200 baud.
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Aileen/*
* ==================================================================
* Generated by Codey.online — https://www.codey.online
* ==================================================================
* Project : 4x4 Matrix Keypad Input Reader
* Board : Arduino UNO (arduino:avr:uno)
* Parts : Keypad 4x4
* Libraries : Keypad 3.1.1
*
* Codey Online is an AI-powered browser IDE for Arduino and ESP32.
* Describe your project and Codey writes the code, draws the wiring
* diagram and uploads it to your board, straight from the browser.
* This code is free to use, modify and share, without warranty.
* ==================================================================
*/
#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void setup() {
Serial.begin(115200);
Serial.println(F("4x4 Keypad Demo"));
Serial.println(F("Press any key on the keypad..."));
}
void loop() {
char key = keypad.getKey();
if (key) {
Serial.print(F("Key Pressed: "));
Serial.println(key);
}
}Nödvändiga bibliotek: Keypad 3.1.1
Wiring diagram and example code generated by Codey.online — https://www.codey.online
This circuit connects a 4x4 matrix keypad directly to the ESP32 GPIOs. The Keypad library scans the matrix rows and columns using internal pull-up resistors. Pressing any key prints its character to the Serial Monitor in real time.
/*
* ==================================================================
* Generated by Codey.online — https://www.codey.online
* ==================================================================
* Project : ESP32 4x4 Matrix Keypad Reader
* Board : ESP32 DEVKIT V1 (esp32:esp32:esp32doit-devkit-v1)
* Parts : Keypad 4x4
* Libraries : Keypad 3.1.1
*
* Codey Online is an AI-powered browser IDE for Arduino and ESP32.
* Describe your project and Codey writes the code, draws the wiring
* diagram and uploads it to your board, straight from the browser.
* This code is free to use, modify and share, without warranty.
* ==================================================================
*/
#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {19, 18, 5, 4};
byte colPins[COLS] = {13, 12, 14, 27};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void setup() {
Serial.begin(115200);
Serial.println("4x4 Keypad Test Ready. Press any key...");
}
void loop() {
char customKey = keypad.getKey();
if (customKey) {
Serial.print("Key pressed: ");
Serial.println(customKey);
}
}Nödvändiga bibliotek: Keypad 3.1.1
Wiring diagram and example code generated by Codey.online — https://www.codey.online
