/************************************************
TITLE: Temperature Monitoring System using ESP32 Microcontroller
SUBMITTED BY: PENTUAN, ALVIN
SUBMITTED TO: PROF. MICHAEL SAMONTE
*************************************************/
#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define DHTPIN 4
#define DHTTYPE DHT22
#define LED1 2
#define LED2 5
#define LED3 18
#define LED4 19
#define BUZZER 15
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 4);
void setup() {
lcd.init(); // initialize the LCD
lcd.backlight(); // turn on backlight
dht.begin(); // initialize DHT22 sensor
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(LED4, OUTPUT);
pinMode(BUZZER, OUTPUT);
}
void loop() {
float temp = dht.readTemperature(); // read temperature data from DHT22
float hum = dht.readHumidity(); // read humidity data from DHT22
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(temp);
lcd.print(" C");
if (temp < 28.0) {
digitalWrite(LED1, HIGH);
digitalWrite(LED2, HIGH);
digitalWrite(LED3, LOW);
digitalWrite(LED4, LOW);
tone(BUZZER, 1000); // Start the buzzer at 1 kHz
}
else {
digitalWrite(LED1, LOW);
digitalWrite(LED2, LOW);
digitalWrite(LED3, HIGH);
digitalWrite(LED4, HIGH);
noTone(BUZZER); // Stop the buzzer
}
lcd.setCursor(0, 1);
lcd.print("Humidity: ");
lcd.print(hum);
lcd.print(" %");
lcd.setCursor(0, 2);
lcd.print("Created By:");
lcd.setCursor(0, 3);
lcd.print("Alvin C. Pentuan");
}
esp:VIN
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esp:D33
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esp:RX2
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esp:D21
esp:RX0
esp:TX0
esp:D22
esp:D23
dht1:VCC
dht1:SDA
dht1:NC
dht1:GND
lcd1:GND
lcd1:VCC
lcd1:SDA
lcd1:SCL
bz1:1
bz1:2
led1:A
led1:C
led2:A
led2:C
r1:1
r1:2
led3:A
led3:C
led4:A
led4:C
r2:1
r2:2
r3:1
r3:2
r4:1
r4:2