#include <Wire.h>
#include <WiFi.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHTesp.h>
#include <PubSubClient.h>
// Christopher Rodriguez
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
const int DHT_PIN = 15;
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; /// wifi ssid clave del WIFI simulado
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";// mosquitto es el server url, si tiene duda ingrese desde el navegador
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;
int sensorPin = 26;
DHTesp sensor;
void setup_wifi() {
delay (10);
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() );
}
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]); }}
void reconnect() {
while (!client. connected()) {
Serial.print("Attempting MQTT connection ... ");
String clientId = "ESP32Client-";
clientId += String(random(0xffff), HEX);
if (client. connect(clientId.c_str())) {
Serial.println("Connected");
client.publish("/ThinkIOT/Publish", "Welcome");
client. subscribe("/ThinkIOT/Subscribe");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}}
}
void setup( ) {
pinMode(2, OUTPUT);
Serial.begin(115200);
setup_wifi();
client. setServer(mqtt_server, 1883);
client.setCallback(callback);
dht. setup(DHT_PIN, DHTesp:: DHT22);
sensor.setup(sensorPin, DHTesp::DHT22);
Serial.begin(115200);
oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);
oled.clearDisplay();
oled.setTextSize(2);
oled.setTextColor(WHITE);
oled.setCursor(0, 2);
oled.display();
delay(500);
}
void loop() {
if (!client. connected()) {
reconnect();
}
client. loop();
unsigned long now = millis();
if (now - lastMsg > 2000) { //comando de publicación de datos
lastMsg = now;
TempAndHumidity data = dht.getTempAndHumidity();
String temp = String(data. temperature, 2);
client.publish("/Thinkitive/temp", temp.c_str()); // publish temp topic /ThinkIOT/temp
String hum = String(data.humidity, 1);
client.publish("/Thinkitive/hum", hum.c_str()); // publish hum topic /ThinkIOT/hum
Serial.print("Temperature: ");
Serial.println(temp);
Serial. print ("Humidity: ");
Serial.println(hum);
oled.clearDisplay();
oled.setTextSize(2);
oled.setTextColor(WHITE);
oled.setCursor(0, 2);
oled.print("TEMP=" + String(data.temperature, 1) + "C");
oled.setCursor(0, 36);
oled.display();
delay(2000);
oled.clearDisplay();
if (data.temperature <= 37) {
oled.setCursor(0, 27);
oled.println("TEMPERATURA NORMAL");
oled.display();
}
else {
oled.setCursor(0, 45);
oled.println("TEMPERATURA ALTA");
oled.display();
}
delay(2000);
oled.clearDisplay();
}
}