Here is my code.
/*
Labo Sensors
Connected to Huzzah ESP8266
Contains theses sensors:
-Temperature and humidity
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"
// DHT22 Temperature sensor settings
#define DHTPIN 2 // what digital pin we're connected to temperature sensor
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
// Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);
// Light Sensor
const int light = 4; // Sensor is connected to ESP8266 pin #4
int lightState = 0; // Reset the light sensor
char* lightOnOff[]={"OFF","ON"};
// Water leak sensor
const int flood = 12; // the flood sensor that is connected to pin 12
int floodState = 0; //Reset the flood detector
//Network value
const char* ssid = "Network";
const char* password ="Password";
const char* mqtt_server = "10.0.1.101";
WiFiClient espClient;
PubSubClient client(espClient);
char message_buff[50];
void setup() {
Serial.begin(115200); // Starts the serial communication
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
Serial.println("DHTxx test!");
dht.begin();
}
void loop() {
if (!client.connected()){
reconnect();
}
client.loop();
Serial.println("");
Serial.println("Sending Value by MQTT");
sendMessage(); //Transmit by MQTT different sensors
}
//sendMessage Function
void sendMessage(){
//Temperature and Humidity sensor
delay(2000);
float h = dht.readHumidity();// Humidity
float t = dht.readTemperature();// Temperature in Celsius
String pubString = String(t);
pubString.toCharArray(message_buff, pubString.length()+1);
client.publish("Boubounouche/Labo/Temperature", message_buff);
pubString = String(h);
pubString.toCharArray(message_buff, pubString.length()+1);
client.publish("Boubounouche/Labo/Humidity", message_buff);
//Publishing Light Sensor
lightState = digitalRead(light);
Serial.print(F("\nSending light sensor val "));
Serial.println(lightOnOff[lightState]);
pubString = String(lightOnOff[lightState]);
pubString.toCharArray(message_buff, pubString.length()+1);
client.publish("Boubounouche/Labo/LightSensor", message_buff);
// Publishing Flood detector hot water tank
floodState = digitalRead(flood);
Serial.println(floodState);
pubString = String(floodState);
pubString.toCharArray(message_buff, pubString.length()+1);
client.publish("Boubounouche/Labo/Flood", message_buff);
delay(8000);
}
// Establishing connection to Wifi
void setup_wifi(){
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED){
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi Connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
}
void reconnect(){
//Loop until we're reconnected
while (!client.connected()){
Serial.println("");
Serial.print("Attempting MQTT connection...");
//Attempe to reconnect
if (client.connect("ESP8266Client")){
Serial.println("connected");
}
else{
Serial.print("failed reconnection");
Serial.print(client.state());
Serial.println("try again in 5 seconds");
//Wait 5 seconds before retrying
delay(5000);
}
}
}