#define BLYNK_TEMPLATE_ID "TMPL3QdBUqQfm"
#define BLYNK_TEMPLATE_NAME "IOT Project"
#define BLYNK_AUTH_TOKEN "ZIASTL06s3cvNRbFZDvlK-jdXKEnj4OA"
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
unsigned int value = 0;
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include "DHTesp.h"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
// Your WiFi credentials.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
#include <DHT.h>
// Pins
#define TRIG_PIN 4
#define ECHO_PIN 0
#define DHT_PIN 15
#define DHT_TYPE DHT22
#define LED_PIN1 2
#define LED_PIN2 17
#define SPEAKER_PIN 16
#define SDA 13 //Define SDA pins
#define SCL 14 //Define SCL pins
LiquidCrystal_I2C lcd(0x27,16,2);
DHT dht(DHT_PIN, DHT_TYPE);
void sendSensorData() {
// Ultrasonic sensor
long duration, distance;
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
duration = pulseIn(ECHO_PIN, HIGH);
distance = (duration / 2) / 29.1; // Convert to cm
// DHT sensor
float temperature = dht.readTemperature();
float humidity = dht.readHumidity();
// Send data to Blynk
Blynk.virtualWrite(V2, distance);
Blynk.virtualWrite(V0, temperature);
Blynk.virtualWrite(V3, humidity);
// Check if bin is full
}
BlynkTimer timer;
// This function is called every time the Virtual Pin 0 state changes
BLYNK_WRITE(V4)
{
Serial.println("Inside Blynk Write");
if(param.asInt() == 1)
{
Serial.println("Blynk Write: Value is 1");
//digitalWrite(2, HIGH); 
digitalWrite(LED_PIN1, HIGH);
Blynk.virtualWrite(V1,"Started Successfully.");
sendSensorData();
}
else
{
Serial.println("Blynk Write: Value is 0");
//digitalWrite(2, LOW);
digitalWrite(LED_PIN1, LOW);
digitalWrite(LED_PIN2, HIGH);
}
}
// This function is called every time the device is connected to the Blynk.Cloud
BLYNK_CONNECTED()
{
Blynk.syncVirtual(V0);
Blynk.syncVirtual(V1);
Blynk.syncVirtual(V2);
Blynk.syncVirtual(V3);
Blynk.syncVirtual(V4);
Serial.println("Inside Blynk: Blynk is Connected");
lcd.clear();
lcd.print("Blynk -Connected");
delay(5000);
}
// This function sends Arduino's uptime every second to Virtual Pin 2.
void myTimerEvent()
{
Blynk.virtualWrite(V0, millis() / 1000);
Blynk.virtualWrite(V1, millis() / 1000);
Blynk.virtualWrite(V2, millis() / 1000);
Blynk.virtualWrite(V3, millis() / 1000);
Blynk.virtualWrite(V4, millis() / 1000);
}
bool i2CAddrTest(uint8_t addr) {
Wire.begin();
Wire.beginTransmission(addr);
if (Wire.endTransmission() == 0) {
return true;
}
return false;
}
void setup()
{
Wire.begin(SDA, SCL);
if (!i2CAddrTest(0x27)) {
lcd = LiquidCrystal_I2C(0x3F, 16, 2);
}
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("Smart Campus");
lcd.setCursor(0,1);
lcd.print("Waste Management");
delay(2500);
lcd.clear();
lcd.print(" Version 0.0.1");
pinMode(5, INPUT_PULLUP);
//pinMode(2, OUTPUT);
//pinMode(17, OUTPUT);
pinMode(LED_PIN1, OUTPUT);
pinMode(LED_PIN2, OUTPUT);
pinMode(SPEAKER_PIN, OUTPUT);
// Begin.
Serial.begin(115200);
Serial.println("Serial Prints Starts...");
Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
dht.begin();
// Set a timer to send sensor data every 10 seconds
timer.setInterval(10000L, sendSensorData);
}
void loop()
{
Blynk.run();
timer.run();
// DHT sensor
float temperature = dht.readTemperature();
float humidity = dht.readHumidity();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Temp: " + String(temperature, 2) + " C");
lcd.setCursor(0,1);
lcd.print("Humidity: " + String(humidity, 1) + "%");
//lcd.setCursor(0,1); 
//lcd.print("Counter:"); 
//lcd.print(millis() / 1000);
delay(5000);
}