#include <Keypad.h>
#include <WiFi.h>
#include "PubSubClient.h"
#include <DHT.h>
#include <DHTesp.h>
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "a";
const char * MQTT_ID = "8194acc9-23c8-4829-b11e-ffd228cf31bd";
int Port = 1883;
int buzzer=21;
const int DHTPIN = 25;
const int DHTTYPE = DHT22;
DHT dht(DHTPIN,DHTTYPE);
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 };
uint8_t rowPins[ROWS] = { 19, 18, 5, 17 };
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
WiFiClient espClient;
PubSubClient client(espClient);
void WIFIConnect() {
Serial.println("Connecting to SSID: Wokwi-GUEST");
WiFi.begin("Wokwi-GUEST", "");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected");
Serial.print(", IP address: ");
Serial.println(WiFi.localIP());
}
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);
}
}
}
String stMessage;
void callback(char* topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.println(topic);
Serial.print("Message: ");
stMessage="";
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
stMessage += (char)message[i];
}
Serial.println();
if(stMessage=="true"){
tone(buzzer, 1000);
delay(300);
noTone(buzzer);
digitalWrite(buzzer, LOW);
}
else if(stMessage=="false"){
tone(buzzer, 1000);
delay(300);
noTone(buzzer);
delay(300);
tone(buzzer, 1000);
delay(300);
noTone(buzzer);
delay(300);
tone(buzzer, 1000);
delay(300);
noTone(buzzer);
delay(300);
digitalWrite(buzzer, LOW);
}
}
void testdht(){
float doam = dht.readHumidity();
float doC = dht.readTemperature();
Serial.println(doam);
Serial.println(doC);
delay(10000);
String temp = String(doC);
String humidity = String(doam);
String JSONMessage = " {\"temp\": \""+temp+"\", \"humidity\": \""+humidity+"\"}";
client.publish("vlute/dht22/4223", (char*) JSONMessage.c_str());
Serial.println(JSONMessage);
}
void setup() {
Serial.begin(9600);
pinMode(buzzer, OUTPUT);
WIFIConnect();
dht.begin();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
client.subscribe(MQTT_Topic);
}
String matkhau;
void loop() {
if (!client.connected()) {
MQTT_Reconnect();
}
client.loop();
char key = keypad.getKey();
if (key != NO_KEY && key!='#'&& key!='*') {
if(matkhau.length()<6){
matkhau=matkhau+key;
Serial.println(key);
}
else{
Serial.println("Mật khẩu không quá 6 kí tự, nhập lại!");
matkhau="";
}
}
else if(key=='*'){
matkhau="";
Serial.println("Đã reset mật khẩu");
}
else if(key=='#'){
Serial.println("Mật khẩu đã gửi: "+matkhau);
client.publish("matkhau/1235",matkhau.c_str());
matkhau="";
}
// delay(10000);
// float doam = dht.readHumidity();
// float doC = dht.readTemperature();
// Serial.println(doam);
// Serial.println(doC);
// String temp = String(doC);
// String humidity = String(doam);
// String JSONMessage = " {\"temp\": \""+temp+"\", \"humidity\": \""+humidity+"\"}";
// client.publish("vlute/dht22/4223", (char*) JSONMessage.c_str());
// Serial.println(JSONMessage);
}