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main.ino
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main.ino
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#include <Wire.h>
#include "DHT.h"
#include "MQ135.h"
/*
* https://hackaday.io/project/3475-sniffing-trinket/log/12363-mq135-arduino-library
*/
#include <ESP8266WiFi.h>
#include <Ticker.h>
#include <AsyncMqttClient.h>
#define WIFI_SSID *****
#define WIFI_PASSWORD *****
// Mosquitto MQTT Broker
#define MQTT_HOST IPAddress(***, ***, ***, ***)
// For a cloud MQTT broker, type the domain name
//#define MQTT_HOST "example.com"
#define MQTT_PORT 1883
// Temperature MQTT Topics
#define MQTT_PUB_TEMP "nodemcu/dht/temperature"
#define MQTT_PUB_HUM "nodemcu/dht/humidity"
#define MQTT_PUB_RZERO "nodemcu/mq135/rzero"
#define MQTT_PUB_AIRQUALITY "nodemcu/mq135/airquality"
// Microphone MQTT Topics
#define MQTT_PUB_SOUND "nodemcu/ky037/sound"
// Digital pin connected to the DHT sensor
#define DHTPIN 5 //GPIO4 or D4
uint8_t DHTPin = D5;
// Microphone pin
int sound_digital = D7;
int sound_value;
bool sound;
// Uncomment whatever DHT sensor type you're using
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Initialize DHT sensor
DHT dht(DHTPin, DHTTYPE);
// Initialize MQ-135
MQ135 gasSensor = MQ135(0); //Assumes A0 is the analogue pin 0
// Variables to hold sensor readings
float temp;
float hum;
float airquality = 0;
float rzerovalue = 0;
int mq135 = A0; //MQ-135 data is an analogue value that is acquired via the A0 port of the nodeMCU
AsyncMqttClient mqttClient;
Ticker mqttReconnectTimer;
WiFiEventHandler wifiConnectHandler;
WiFiEventHandler wifiDisconnectHandler;
Ticker wifiReconnectTimer;
unsigned long previousMillis = 0; // Stores last time temperature was published
const long interval = 10000; // Interval at which to publish sensor readings
void connectToWifi() {
Serial.println("Connecting to Wi-Fi...");
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}
void onWifiConnect(const WiFiEventStationModeGotIP& event) {
Serial.println("Connected to Wi-Fi.");
connectToMqtt();
}
void onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {
Serial.println("Disconnected from Wi-Fi.");
mqttReconnectTimer.detach(); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
wifiReconnectTimer.once(2, connectToWifi);
}
void connectToMqtt() {
Serial.println("Connecting to MQTT...");
mqttClient.connect();
}
void onMqttConnect(bool sessionPresent) {
Serial.println("Connected to MQTT.");
Serial.print("Session present: ");
Serial.println(sessionPresent);
}
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println("Disconnected from MQTT.");
if (WiFi.isConnected()) {
mqttReconnectTimer.once(2, connectToMqtt);
}
}
/*void onMqttSubscribe(uint16_t packetId, uint8_t qos) {
Serial.println("Subscribe acknowledged.");
Serial.print(" packetId: ");
Serial.println(packetId);
Serial.print(" qos: ");
Serial.println(qos);
}
void onMqttUnsubscribe(uint16_t packetId) {
Serial.println("Unsubscribe acknowledged.");
Serial.print(" packetId: ");
Serial.println(packetId);
}*/
void onMqttPublish(uint16_t packetId) {
Serial.print("Publish acknowledged.");
Serial.print(" packetId: ");
Serial.println(packetId);
}
void setup() {
Serial.begin(115200);
Serial.println("START");
dht.begin();
pinMode(sound_digital, INPUT);
sound_value = 0;
sound = false;
wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);
wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);
mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
//mqttClient.onSubscribe(onMqttSubscribe);
//mqttClient.onUnsubscribe(onMqttUnsubscribe);
mqttClient.onPublish(onMqttPublish);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
// If your broker requires authentication (username and password), set them below
mqttClient.setCredentials("boomy", "thai1ma2");
connectToWifi();
}
void loop() {
//Microphone
sound_value = digitalRead(sound_digital);
if(sound_value == 1 && sound == false) {
sound = true;
}
delay(1);
unsigned long currentMillis = millis();
// Every X number of seconds (interval is defined earlier)
// it publishes a new MQTT message
if (currentMillis - previousMillis >= interval) {
// Save the last time a new reading was published
previousMillis = currentMillis;
// New DHT sensor readings
hum = dht.readHumidity();
// Read temperature as Celsius (the default)
temp = -2 + dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
//temp = dht.readTemperature(true);
// Read MQ-135 data
airquality = gasSensor.getCorrectedPPM(temp, hum);
rzerovalue = gasSensor.getCorrectedRZero(temp, hum);
// Check if any reads failed and exit early (to try again).
if (isnan(temp) || isnan(hum)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
} else if (isnan(mq135)) {
Serial.println(F("Failed to read from MQ-135 sensor!"));
return;
}
// Publish an MQTT message on topic /dht/temperature
uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(temp).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId: %i", MQTT_PUB_TEMP, packetIdPub1);
Serial.printf("Message: %.2f \n", temp);
// Publish an MQTT message on topic /dht/humidity
uint16_t packetIdPub2 = mqttClient.publish(MQTT_PUB_HUM, 1, true, String(hum).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_HUM, packetIdPub2);
Serial.printf("Message: %.2f \n", hum);
// Publish an MQTT message on topic /mq135/rzero
uint16_t packetIdPub3 = mqttClient.publish(MQTT_PUB_RZERO, 1, true, String(rzerovalue).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_RZERO, packetIdPub3);
Serial.printf("Message: %.2f \n", rzerovalue);
// Publish an MQTT message on topic /mq135/airquality
uint16_t packetIdPub4 = mqttClient.publish(MQTT_PUB_AIRQUALITY, 1, true, String(airquality).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_AIRQUALITY, packetIdPub4);
Serial.printf("Message: %.2f \n", airquality);
// Publish an MQTT message on topic /ky037/alert
//uint16_t packetIdPub5 = mqttClient.publish(MQTT_PUB_SOUND, 1, true, sound ? "1" : "0");
if(sound) {
uint16_t packetIdPub5 = mqttClient.publish(MQTT_PUB_SOUND, 1, true, "ON");
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_SOUND, packetIdPub5);
sound = false;
} else {
uint16_t packetIdPub5 = mqttClient.publish(MQTT_PUB_SOUND, 1, true, "OFF");
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: ", MQTT_PUB_SOUND, packetIdPub5);
}
}
}