#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include "DHT.h"
#define DHTPIN 13
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
int led1=27;
/********* WiFi Access Point ***********/
#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""
/***** Adafruit.io Setup *************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883 // use 8883 for SSL
#define AIO_USERNAME "venkateshprasanna"
#define AIO_KEY "aio_AIWq79iiQcG5rctnEks5JjRaJdU5"
/* Create an WiFiClient class to connect to the MQTT server.*/
WiFiClient client;
/* Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.*/
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
/******** Feeds **************/
Adafruit_MQTT_Publish dht_temp = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/DHT_Temp");
Adafruit_MQTT_Publish dht_humidity = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/DHT_Humidity");
// Setup a feed called 'onoff' for subscribing to changes.
Adafruit_MQTT_Subscribe onoffbutton = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/onoff");
void MQTT_connect();
void setup() {
Serial.begin(9600);
delay(10);
Serial.println(F("DHTxx test!"));
dht.begin();
Serial.println(F("Adafruit MQTT demo"));
// Connect to WiFi access point.
Serial.println(); Serial.println();
Serial.print("Connecting to ");
Serial.println(WLAN_SSID);
WiFi.begin(WLAN_SSID, WLAN_PASS);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.println("IP address: "); Serial.println(WiFi.localIP());
// digitalWrite(led1, HIGH);
// Setup MQTT subscription for onoff feed.
pinMode(led1,OUTPUT);
mqtt.subscribe(&onoffbutton);
// digitalWrite(led1, HIGH);
}
void loop() {
/* Ensure the connection to the MQTT server is alive (this will make the first
connection and automatically reconnect when disconnected). See the MQTT_connect function definition further below. */
MQTT_connect();
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(5000))) {
if (subscription == &onoffbutton) {
Serial.print(F("Got: "));
Serial.println((char *)onoffbutton.lastread);
if (strcmp((char *)onoffbutton.lastread, "ON") == 0) {
digitalWrite(led1, HIGH);
Serial.println("led is on");
}
if (strcmp((char *)onoffbutton.lastread, "OFF") == 0) {
digitalWrite(led1, LOW);
Serial.println("led is off");
}
}
}
// Now we can publish stuff!
float h = dht.readHumidity();
float t = dht.readTemperature();
float f = dht.readTemperature(true);
// int r=analogRead(A6);
Serial.print("Humidity(%): ");
Serial.print(h);
Serial.print(" Temperature (°C): ");
Serial.print(t);
Serial.print(" Temperature(F): ");
Serial.println(f);
if (! dht_temp.publish(t)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
delay(10000);
if (! dht_humidity.publish(h)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
/*delay(1000);
if (! pot.publish(r)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
} */
// ping the server to keep the mqtt connection alive
// NOT required if you are publishing once every KEEPALIVE seconds
/*
if(! mqtt.ping()) {
mqtt.disconnect();
}
*/
}
/* Function to connect and reconnect as necessary to the MQTT server.
Should be called in the loop function and it will take care if connecting. */
void MQTT_connect() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 1;
while ((ret = mqtt.connect()) != 0) {
// connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 3 seconds...");
mqtt.disconnect();
delay(3000);
retries--;
if (retries == 0) {
// basically die and wait for reset
while (1);
}
}
Serial.println("MQTT Connected!");
}