/*
* Use NodeMCU to drive DHT11 and send temperature/humidity value to MQTT server
* CopyRight www.osoyoo.com
* Software:
* Arduino IDE(version 1.6.4+)
* ESP8266 Board Package and the Serial Port Driver
* MQTT Clirnt (MQTTBox here)
* Arduino library: PubSubClient
* Arduino library:DHT
* Connection
* NodeMCU DHT11 sensor
* 3.3v VCC
* D3 DATA
* GND Ground
* *
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include<dht.h>
dht DHT;
// Define NodeMCU D3 pin to as temperature data pin of DHT11
#define DHT11_PIN D3
// Update these with values suitable for your network.
//const char* ssid = "******";//put your own wifi ssid here
//const char* password = "******";// put your wifi password here
const char* ssid = "PTS-2F";//put your wifi ssid here
const char* password = "" ;//put your wifi password here
const char* mqtt_server = "broker.mqtt-dashboard.com";
//const char* mqtt_server = "iot.eclipse.org";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
void setup_wifi() {
delay(100);
// We start by connecting to a WiFi network
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("MQTT-DHT11-Testing");
}
void callback(char* topic, byte* payload, unsigned int length)
{
Serial.print("Command is : [");
Serial.print(topic);
int p =(char)payload[0]-'0';
int chk = DHT.read11(DHT11_PIN);
// if MQTT comes a 0 message, show humidity
if(p==0)
{
Serial.println("to show humidity!]");
Serial.print(" Humidity is: " );
Serial.print(DHT.humidity, 1);
Serial.println('%');
}
// if MQTT comes a 1 message, show temperature
if(p==1)
{
// digitalWrite(BUILTIN_LED, HIGH);
Serial.println(" is to show temperature!] ");
int chk = DHT.read11(DHT11_PIN);
Serial.print(" Temp is: " );
Serial.print(DHT.temperature, 1);
Serial.println(' C');
}
Serial.println();
} //end callback
void reconnect() {
// Loop until we're reconnected
while (!client.connected())
{
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "ESP8266Client-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
//if you MQTT broker has clientID,username and password
//please change following line to if (client.connect(clientId,userName,passWord))
if (client.connect(clientId.c_str()))
{
Serial.println("connected");
//once connected to MQTT broker, subscribe command if any
client.subscribe("Alex9ufo-DHT3-Command");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 6 seconds before retrying
delay(6000);
}
}
} //end reconnect()
void setup() {
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
int chk = DHT.read11(DHT11_PIN);
Serial.print(" Starting Humidity: " );
Serial.print(DHT.humidity, 1);
Serial.println('%');
Serial.print(" Starting Temparature ");
Serial.print(DHT.temperature, 1);
Serial.println('C');
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
long now = millis();
// read DHT11 sensor every 6 seconds
if (now - lastMsg > 8000) {
lastMsg = now;
int chk = DHT.read11(DHT11_PIN);
String msg="";
msg= msg+ DHT.temperature;
char message[58];
msg.toCharArray(message,58);
client.publish("alex9ufo-temp-RaspiData", message);
msg="";
msg= msg+ DHT.humidity;
msg.toCharArray(message,58);
client.publish("alex9ufo-humi-RaspiData",message);
msg="";
msg= msg+ DHT.temperature;
msg = msg+"," ;
msg=msg+DHT.humidity ;
msg.toCharArray(message,58);
Serial.print(" Starting Temparature ");
Serial.print(DHT.temperature, 1);
Serial.print('C');
Serial.print(" Starting Humidity: " );
Serial.print(DHT.humidity, 1);
Serial.println('%');
Serial.println(message);
//publish sensor data to MQTT broker
client.publish("alex9ufo-DHT11-RaspiData", message);
}
}
