#include <WiFi.h>
#include "PubSubClient.h"
#include <Keypad.h>
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "Keypad";
// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "9392e878-a5de-48cf-9e1c-f8523020d1";
int Port = 1883;
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
{ '1', '2', '3', 'A' },
{ '4', '5', '6', 'B' },
{ '7', '8', '9', 'C' },
{ '*', '0', '#', 'D' }
};
uint8_t colPins[COLS] = { 16, 4, 2, 15}; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 19, 18, 5, 17}; // Pins connected to R1, R2, R3, R4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;
void WIFIConnect() {
Serial.println("Connecting to SSID: Wokwi-GUEST");
WiFi.begin("Wokwi-GUEST", "");
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected");
Serial.print(", IP address: ");
Serial.println(WiFi.localIP());
}
String pass="";
void GuiPass(String a){
client.publish("KeyPad",String(a).c_str());
}
void MQTT_Reconnect() {
while (!client.connected()) {
if (client.connect(MQTT_ID)) {
Serial.print("MQTT Topic: ");
Serial.print(MQTT_Topic);
Serial.print(" connected");
client.subscribe(MQTT_Topic);
Serial.println("");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void callback(char* topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.println(topic);
Serial.print("Message: ");
String stMessage;
if(stMessage="success"){
tone(21,100,1000);
delay(2000);
}else if(stMessage="error"){
digitalWrite(21, HIGH);
delay(1000);
digitalWrite(21, LOW);
delay(1000);
}
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
stMessage += (char)message[i];
}
Serial.println();
}
void setup() {
Serial.begin(115200);
delay(10);
WIFIConnect();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
pinMode(21, OUTPUT);
}
void loop() {
char key = keypad.getKey();
if (key) {
if(key!='#'){
Serial.println(key);
pass +=key;
}
else{
GuiPass(pass);
Serial.println(pass);
pass="";
}
}
delay(10);
if (!client.connected()) {
MQTT_Reconnect();
}
client.loop();
}