#include <WiFi.h>
#include "PubSubClient.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
#define NTP_SERVER "pool.ntp.org"
#define UTC_OFFSET 0
#define UTC_OFFSET_DST 0
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "vlute/iot/dht";
// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "";
int Port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;
String dulieu ="";
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);
}
}
}
void spinner() {
static int8_t counter = 0;
const char* glyphs = "\xa1\xa5\xdb";
LCD.setCursor(15, 1);
LCD.print(glyphs[counter++]);
if (counter == strlen(glyphs)) {
counter = 0;
}
}
void printLocalTime() {
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
LCD.setCursor(0, 1);
LCD.println("Connection Err");
return;
}
LCD.setCursor(8, 0);
LCD.println(&timeinfo, "%H:%M:%S");
LCD.setCursor(0, 1);
LCD.println(&timeinfo, "%d/%m/%Y %Z");
}
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];
}
dulieu = stMessage;
Serial.println();
if (stMessage == "on") {
digitalWrite(ledPin, HIGH);
LCD.setCursor(0, 0);
LCD.print("Den sang");
}
else if (stMessage == "off") {
digitalWrite(ledPin, LOW);
LCD.setCursor(0, 0);
LCD.print("Den tat ");
}
}
void setup() {
Serial.begin(115200);
WIFIConnect();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
pinMode(ledPin, OUTPUT);
LCD.init();
LCD.backlight();
LCD.setCursor(0, 0);
LCD.print("");
LCD.setCursor(0, 1);
LCD.print("WiFi ");
LCD.clear();
configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
}
void loop() {
// Serial.println(digitalRead(ledPin));
// if(digitalRead(ledPin== 1)){
// LCD.setCursor(0, 1);
// LCD.print("Den sang");
// }
// if(digitalRead(ledPin==0)){
// LCD.setCursor(0, 1);
// LCD.print("Den toi ");
// }
delay(1000);
if (!client.connected()) {
MQTT_Reconnect();
}
client.loop();
}