pubsub.ino

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

// DHT config
#define DHTPIN D4
#define DHTTYPE DHT11
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;

// OLED config
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1        // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Light config
const int lightPin = A0;

// Led config
const int led = D5;

// Wifi config
const char* ssid = "LSC_IOT";
const char* password = "12345678";
const char* mqtt_server = "10.3.141.1";

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;

String getTemperature() {
  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (isnan(event.temperature)) {
    Serial.println("Error reading temperature!");
    return "Error reading temperature!";
  } else {
    Serial.print("Temperature: ");
    Serial.print(event.temperature);
    Serial.println(" *C");
    return String(event.temperature);
  }
}

String getHumidity() {
  sensors_event_t event;
  dht.humidity().getEvent(&event);
  if (isnan(event.relative_humidity)) {
    Serial.println("Error reading humidity!");
    return "Error reading humidity!";
  } else {
    Serial.print("Humidity: ");
    Serial.print(event.relative_humidity);
    Serial.println("%");
    return String(event.relative_humidity);
  }
}

String getLight() {
  int lightValue = analogRead(lightPin);
  Serial.print("Light: ");
  Serial.println(lightValue);
  return String(lightValue);
}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  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());
}

// If light > 700 then turn on led
void lightCallback(double light){
  if(light >= 700) {
    digitalWrite(led, 1);
  } else {
    digitalWrite(led, 0);
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
  if(String(topic) == "equipe4/luz") {
    double light = String((char*)payload).toDouble();
    Serial.println(light);
    lightCallback(light);
  }
}

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 (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("inTopic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(led, OUTPUT);  // Initialize the BUILTIN_LED pin as an output
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);
  delayMS = sensor.min_delay / 1000;

  //digitalWrite(led, 1);
}

/* the loop function runs over and over again forever, sending:
  - temperature to: equipe2/temperature
  - humidity to: equipe2/humidity
  - light to: equipe2/light
*/
void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    String temperature = getTemperature();
    String humidity = getHumidity();
    String light = getLight();

    client.publish("equipe2/temperatura", temperature.c_str());
    client.publish("equipe2/humidade", humidity.c_str());
    client.publish("equipe2/luz", light.c_str());

    client.subscribe("equipe4/luz");
    // client.subscribe("+/temperatura");
    // client.subscribe("+/humidade");

  }
}