#define BLYNK_TEMPLATE_ID "TMPL3swfhcOcv"
#define BLYNK_TEMPLATE_NAME "smart cattle monitoring"
#define BLYNK_AUTH_TOKEN "S1U6-pCAoLFYlwFf0jH1K-9AmmrrKqsv"
#include <Wire.h>
#include <WiFi.h>
#include <DHT.h>
#include <PubSubClient.h>
#include <Arduino.h>
#include <BlynkSimpleEsp32.h>
#define DHT_PIN 12
#define PULSE_PIN 35
#define MQTT_SERVER "broker.emqx.io"
#define MQTT_PORT 1883
const char *ssid = "Wokwi-GUEST";
const char *password = "";
#define MQTT_TOPIC_HR "/heartRate"
#define MQTT_TOPIC_TEMP "/tempValue"
#define MQTT_TOPIC_HUM "/humValue"
WiFiClient espClient;
PubSubClient client(espClient);
DHT dht(DHT_PIN, DHT22);
void setup() {
Wire.begin(23, 22);
Serial.begin(115200);
Serial.println("Hello, ESP32!");
connectToWiFi();
client.setServer(MQTT_SERVER, MQTT_PORT);
dht.begin();
Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
}
void loop() {
Blynk.run();
if (!client.connected()) {
reconnect();
}
float temperature = dht.readTemperature();
float humidity = dht.readHumidity();
int16_t pulseValue = analogRead(PULSE_PIN);
float voltage = pulseValue * (5.0 / 4095.0);
int heartRate = (voltage / 3.3) * 675;
Serial.print("Heart Rate: ");
Serial.print(heartRate);
Serial.print(" Temp: ");
Serial.print(temperature);
Serial.print(" Humidity: ");
Serial.println(humidity);
Serial.print(" Latitude: 12.9165 N\t");
Serial.print("longitude: 79.1325 E\t");
delay(100);
client.publish(MQTT_TOPIC_HR, String(heartRate).c_str());
client.publish(MQTT_TOPIC_TEMP, String(temperature).c_str());
client.publish(MQTT_TOPIC_HUM, String(humidity).c_str());
Blynk.virtualWrite(V1, heartRate); // Assuming V1 is for Heart Rate
Blynk.virtualWrite(V2, temperature); // Assuming V2 is for Temperature
Blynk.virtualWrite(V3, humidity); // Assuming V3 is for Humidity
delay(10);
}
void connectToWiFi() {
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
}
void reconnect() {
while (!client.connected()) {
if (client.connect("esp32_neopixel_controller")) {
Serial.println("Connected to MQTT");
} else {
Serial.print("Failed, rc=");
Serial.print(client.state());
Serial.println(" Retrying in 5 seconds...");
delay(5000);
}
}
}