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Author: triatebr

nodeMCU_mq135-18-06-2018/nodeMCU_mq135-18-06-2018.ino

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+#include <MQ135.h>
+#include <Adafruit_Sensor.h>
+#include <ArduinoJson.h>
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+#include "DHT.h"
+
+#include <stdlib.h>
+
+#define DHTPIN 4 // pino do sensor de temperatura
+#define MQ135PIN 5 // pino do sensor de gas
+#define DHTTYPE DHT22 // DHT 22
+
+DHT dht(DHTPIN, DHTTYPE);
+MQ135 gasSensor = MQ135(MQ135PIN);
+
+// Update these with values suitable for your network.
+
+const char* ssid     = "2.4G_COTONETES";
+const char* password = "31012015anapaulalucas";
+const char* mqttServer = "broker.hivemq.com";
+const int mqttPort = 1883;
+const char* mqttUser = "";
+const char* mqttPassword = "";
+
+char  json[100];
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+void setup() 
+{
+  Serial.begin(115200);
+  Serial.println("DHTxx test!");
+  dht.begin();
+
+  WiFi.begin(ssid, password);
+ 
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.println("Connecting to WiFi..");
+  }
+ 
+  Serial.println("Connected to the WiFi network");
+ 
+  client.setServer(mqttServer, mqttPort);
+ 
+  while (!client.connected()) {
+    Serial.println("Connecting to MQTT...");
+ 
+    if (client.connect("NodeMCUFulvio", mqttUser, mqttPassword)) {
+ 
+      Serial.println("connected");
+ 
+    } else {
+ 
+      Serial.print("failed with state ");
+      Serial.print(client.state());
+      delay(2000);
+ 
+    }
+  }
+}
+
+void loop() 
+{
+  float valor_co2 = gasSensor.getPPM();      
+  // testa se retorno é valido, caso contrário algo está errado.
+  if (isnan(valor_co2)) 
+  {
+    Serial.println("Failed to read from MQ-135");
+  } 
+  else 
+  {
+
+    DynamicJsonBuffer jBuffer;
+    JsonObject& root = jBuffer.createObject();
+
+    root["nivel_co2"] = valor_co2;
+    
+    root.printTo(Serial);
+    Serial.println();
+
+    root.printTo(json);
+
+    client.publish("smartcity/tdc2", json);
+    
+  }
+
+  client.loop();
+  delay(1000);
+  
+}