#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <ESP32Servo.h>
const int NTC_PIN = 34;
const int SERVO_PIN = 18;
const int DHT_PIN = 15;
const int LDR_PIN = 35;
char clientId[50];
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; /// wifi ssid
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";// mosquitto server url
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;
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 mqttReconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
long r = random(1000);
sprintf(clientId, "clientId-%ld", r);
if (client.connect(clientId)) {
Serial.print(clientId);
Serial.println(" connected");
client.subscribe("AA");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
Servo servo;
float convertToTemperature(int adcValue) {
// Convert ADC value to resistance
float resistance = (float)(4095 - adcValue) * 10000 / adcValue;
// Steinhart-Hart equation to calculate temperature in Celsius
float temperature = 1 / (log(resistance / 10000) / 3950 + 1 / 298.15) - 273.15;
return temperature;
}
void setup() {
pinMode(34, INPUT); // Set NTC pin as input
pinMode(18, OUTPUT);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
dht.setup(DHT_PIN, DHTesp::DHT22);
servo.attach(18, 500, 2400);
}
int pos = 0;
void loop() {
if (!client.connected()) {
mqttReconnect();
}
client.loop();
unsigned long now = millis();
if (now - lastMsg > 2000) { //perintah publish data
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
int ldrValue = analogRead(LDR_PIN);
String ldrStr = String(ldrValue);
client.publish("/Thinkitive/ldr", ldrStr.c_str());
// Read NTC sensor value
int ntcValue = analogRead(NTC_PIN);
// Convert analog reading to temperature in Celsius
float temperature = convertToTemperature(ntcValue);
// Convert temperature to String
String ntcStr = String(temperature, 2);
// Publish temperature to MQTT topic
client.publish("/Thinkitive/ntc", ntcStr.c_str());
Serial.print("Temperature: ");
Serial.println(temp);
Serial.print("Humidity: ");
Serial.println(hum);
Serial.print("LDR Value: ");
Serial.println(ldrStr);
Serial.print("NTC Temperature: ");
Serial.println(ntcStr);
for (pos = 0; pos <= 180; pos += 1) {
servo.write(pos);
delay(15);
}
for (pos = 180; pos >= 0; pos -= 1) {
servo.write(pos);
delay(15);
}
}
}