UAS Sistem Mikroprosessor Dan IoT
Nama : Muhammad Harsandy BS NIM : 32222023
Kelas : 2A Telekomunikasi
Buatlah program monitoring suhu dengan sistem IoT (MQTT) menggunakan sensor LM35 dan ESP32, pada laman wokwi.com dengan algoritma berikut ini:
- suhu <19,035 publish pesan dingin
- suhu 19,035 – 21,15 publish pesan hangat
- suhu >21,15 publish pesan panas
x = (dua digit terakhir NIM + Tanggal Lahir + Bulan Lahir + 2 Digit Terakhir tahun lahir) * 0.015.
maka,
x = (23+09+11+4) x 0.015 = 0,705
Berikut kodingannya:
// https://wokwi.com/projects/382880709954964481
#include <WiFi.h>
#include "PubSubClient.h"
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
char clientId[50];
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
int value = 0;
WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;
#define ADC_VREF_mV 5000.0 // in millivolt
#define ADC_RESOLUTION 4096.0
#define PIN_LM35 34
// Function to calculate x based on the algorithm float calculateX() {
// Replace with your NIM, Tanggal Lahir, Bulan Lahir, and 2 Digit Tahun Lahir
int nimLastTwoDigits = 23;
int tanggalLahir = 9;
int bulanLahir = 11;
int tahunLahirLastTwoDigits = 04;
float x = (nimLastTwoDigits + tanggalLahir + bulanLahir + tahunLahirLastTwoDigits) * 0.015;
return x;
}
void setup() {
Serial.begin(9600);
randomSeed(analogRead(0));
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
wifiConnect();
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
client.setServer(mqttServer, port);
client.setCallback(callback);
pinMode(ledPin, OUTPUT);
}
void wifiConnect() { WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) { delay(500);
Serial.print(".");
} }
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("inTopic2A");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
} } }
void callback(char* topic, byte* message, unsigned int length) { Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String stMessage;
for (int i = 0; i < length; i++) { Serial.print((char)message[i]);
stMessage += (char)message[i];
}
Serial.println();
if (String(topic) == "inTopic2A") { Serial.print("Changing output to ");
if (stMessage == "1") { Serial.println("on");
} else if (stMessage == "0") { Serial.println("off");
digitalWrite(ledPin, LOW);
} } }
void loop() {
// get the ADC value from the temperature sensor int adcVal = analogRead(PIN_LM35);
// convert the ADC value to voltage in millivolt
float milliVolt = adcVal * (ADC_VREF_mV / ADC_RESOLUTION);
// convert the voltage to the temperature in Celsius float tempC = milliVolt / 10;
float x = calculateX();
if (!client.connected()) { mqttReconnect();
}
client.loop();
unsigned long now = millis();
if (now - lastMsg > 2000) { lastMsg = now;
//++value;
// print the temperature in the Serial Monitor:
Serial.print("Temperature: ");
Serial.print(tempC); // print the temperature in Celsius Serial.println("°C");
// Check temperature range and publish corresponding message if (tempC < 27 * x) {
snprintf(msg, MSG_BUFFER_SIZE, "Dingin");
} else if (tempC >= 27 * x && tempC <= 30 * x) { snprintf(msg, MSG_BUFFER_SIZE, "Hangat");
} else {
snprintf(msg, MSG_BUFFER_SIZE, "Panas");
}
Serial.print("Publish message: ");
Serial.println(msg);
client.publish("outTopic2A", msg);
} }
