#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <Servo.h>
#define DHT_PIN 15
#define BUZZER 12
#define LEFT_LDR_PIN A0
#define RIGHT_LDR_PIN A1
#define MAIN_SWITCH_TOPIC "ENTC-ADMIN-MAIN-SWITCH"
WiFiClient espClient;
PubSubClient mqttClient(espClient);
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);
DHTesp dhtSensor;
Servo servoMotor;
char tempAr[6];
bool isScheduledON = false;
unsigned long scheduledOnTime;
bool mainSwitchOn = true;
const int thetaOffset = 30;
const float gamma = 0.75;
void setup() {
Serial.begin(115200);
setupWiFi();
setupMqtt();
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
timeClient.begin();
timeClient.setTimeOffset(5.5 * 3600);
pinMode(BUZZER, OUTPUT);
pinMode(LEFT_LDR_PIN, INPUT);
pinMode(RIGHT_LDR_PIN, INPUT);
servoMotor.attach(13); // Pin for servo motor
digitalWrite(BUZZER, LOW);
}
void loop() {
if(!mqttClient.connected()) {
connectToBroker();
}
mqttClient.loop();
updateTemperature();
float leftLDRIntensity = getLDRIntensity(LEFT_LDR_PIN);
float rightLDRIntensity = getLDRIntensity(RIGHT_LDR_PIN);
float maxIntensity = max(leftLDRIntensity, rightLDRIntensity);
float motorAngle = calculateMotorAngle(maxIntensity);
servoMotor.write(motorAngle);
mqttClient.publish("ENTC-ADMIN-TEMP", tempAr);
checkSchedule();
delay(1000);
}
void buzzerOn(bool on) {
if (on) {
tone(BUZZER, 256);
} else {
noTone(BUZZER);
}
}
void setupMqtt() {
mqttClient.setServer("test.mosquitto.org",1883);
mqttClient.setCallback(receiveCallback);
}
void receiveCallback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
char payloadCharAr[length];
for (int i=0; i<length; i++) {
Serial.print((char)payload[i]);
payloadCharAr[i]=(char)payload[i];
}
Serial.println();
if (strcmp(topic, "ENTC-ADMIN-MAIN-ON-OFF") == 0) {
buzzerOn(payloadCharAr[0] == '1');
} else if(strcmp(topic, "ENTC-ADMIN-SCH-ON") == 0) {
if(payloadCharAr[0] == 'N') {
isScheduledON = false;
} else {
isScheduledON = true;
scheduledOnTime = atol(payloadCharAr);
}
} else if(strcmp(topic, MAIN_SWITCH_TOPIC) == 0) {
mainSwitchOn = (payloadCharAr[0] == '1');
if (!mainSwitchOn) {
buzzerOn(false);
}
}
}
void connectToBroker() {
while (!mqttClient.connected()) {
Serial.print("Attempting MQTT connection...");
if(mqttClient.connect("ESP32-12345645454")) {
Serial.println("connected ");
mqttClient.subscribe("ENTC-ADMIN-MAIN-ON-OFF");
mqttClient.subscribe("ENTC-ADMIN-SCH-ON");
mqttClient.subscribe(MAIN_SWITCH_TOPIC);
} else {
Serial.print("failed ");
Serial.print(mqttClient.state());
delay(5000);
}
}
}
void updateTemperature() {
TempAndHumidity data = dhtSensor.getTempAndHumidity();
String(data.temperature, 2).toCharArray(tempAr, 6);
}
void setupWiFi() {
Serial.println();
Serial.print("Connecting to WiFi");
WiFi.begin("Wokwi-GUEST", "", 6);
while (WiFi.status() != WL_CONNECTED) {
delay(100);
Serial.print(".");
}
Serial.println(" Connected!");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
unsigned long getTime() {
timeClient.update();
return timeClient.getEpochTime();
}
void checkSchedule() {
if(isScheduledON) {
unsigned long currentTime = getTime();
if (currentTime > scheduledOnTime) {
buzzerOn(true);
isScheduledON = false;
mqttClient.publish("ENTC-ADMIN-MAIN-ON-OFF-ESP", "1");
mqttClient.publish("ENTC-ADMIN-SCH-ESP-ON", "0");
Serial.println("Scheduled ON");
}
}
}
float getLDRIntensity(int pin) {
int rawValue = analogRead(pin);
return map(rawValue, 0, 1023, 0, 1); // Mapping to range 0-1
}
float calculateMotorAngle(float intensity) {
float D = (intensity == getLDRIntensity(LEFT_LDR_PIN)) ? 1.5 : 0.5;
float motorAngle = min(thetaOffset * D + (180 - thetaOffset) * intensity * gamma, 180);
return motorAngle;
}