#include "DHTesp.h"
#include <WiFi.h>
#include "PubSubClient.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "VLUTE/Ngoc";
const char * MQTT_DoAm = "DoAm";
const char * MQTT_NhietDo = "NhietDo";
// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "98e77b52-0a50-44ff-bc23-2c38d2a2b22e";
int Port = 1883;
#define ROW_NUM 4
#define COLUMN_NUM 4
char keys[ROW_NUM][COLUMN_NUM] = {
{'1','2','3', 'A'},
{'4','5','6', 'B'},
{'7','8','9', 'C'},
{'*','0','#', 'D'}
};
byte pin_rows[ROW_NUM] = {19, 18, 5, 17};
byte pin_column[COLUMN_NUM] = {16, 4, 0, 2};
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 16, 2);
int cursorColumn = 0;
const int DHT_PIN = 15;
const int ledPin = 26;
const int ledPin1 = 23;
int button_pin = 21;
int Balarm = 13;
int Calarm = 12;
int PIRsensor = 2;
int Led_TEST = 14;
int button_state = 0;
int nhietdo;
int doam;
DHTesp dhtSensor;
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);
client.subscribe(MQTT_DoAm);
client.subscribe(MQTT_NhietDo);
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;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
stMessage += (char)message[i];
}
Serial.println();
if (stMessage == "on") {
digitalWrite(ledPin1, HIGH);
}
else if (stMessage == "off") {
digitalWrite(ledPin1, LOW);
}
}
void setup() {
Serial.begin(115200);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
pinMode(PIRsensor, INPUT); // PIR sensor as input
pinMode(Balarm, OUTPUT); // Buzzer alaram as output
pinMode(Led_TEST, OUTPUT);
pinMode(Calarm, OUTPUT);
pinMode(ledPin, OUTPUT);
pinMode(ledPin1, OUTPUT);
pinMode(button_pin, INPUT_PULLUP);
lcd.init(); // initialize the lcd
lcd.backlight();
WIFIConnect();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
}
void loop() {
//bật tắt đèn bằng button
button_state = digitalRead(button_pin);
if (button_state == LOW)
digitalWrite(ledPin, HIGH);
else
digitalWrite(ledPin, LOW);
//nhiệt độ độ ẩm
if (!client.connected()) {
MQTT_Reconnect();
}
TempAndHumidity data = dhtSensor.getTempAndHumidity();
Serial.println("Temp: " + String(data.temperature, 2) + "°C");
Serial.println("Humidity: " + String(data.humidity, 1) + "%");
Serial.println("---");
client.publish(MQTT_NhietDo, String(data.temperature, 2).c_str());
client.publish(MQTT_DoAm, String(data.humidity, 1).c_str());
client.loop();
//bật tắt đèn bằng điều khiển web
if (!client.connected()) {
MQTT_Reconnect();
}
client.loop();
//cảnh báo nhiệt độ, độ ẩm
doam = int(data.humidity);
nhietdo = int(data.temperature);
delay(500);
if(nhietdo >=40, doam >=65){
tone(Calarm, 1600);
delay(1000);
}
else {
noTone(Calarm);
}
//pir sensor
int state = digitalRead(PIRsensor);
delay(500);
if(state == HIGH){
//digitalWrite (Balarm , HIGH);
tone(Balarm, 1600);
digitalWrite (Led_TEST , HIGH);
delay(1000);
}
else {
//digitalWrite (Balarm , LOW);
noTone(Balarm);
digitalWrite (Led_TEST , LOW);
}
char key = keypad.getKey();
if (key) {
lcd.setCursor(cursorColumn, 0); // move cursor to (cursorColumn, 0)
lcd.print(key); // print key at (cursorColumn, 0)
cursorColumn++; // move cursor to next position
if(cursorColumn == 16) { // if reaching limit, clear LCD
lcd.clear();
cursorColumn = 0;
}
}
}