#include <DHT.h>
#include <WiFi.h>
#include <ThingSpeak.h>
#include <WiFiClient.h>

WiFiClient client;
long myChannelNumber =  2642954;
const char * myWriteAPIKey = "9GYRI60762A7COQC";
int statusCode;

#define DHTPIN 21
#define DHTTYPE DHT22
#define STEPPIN 18
#define DIRPIN 19
#define BUTTONPIN 2

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
DHT dht(DHTPIN, DHTTYPE);
int motorSpeed = 0;
bool motorEnabled = false;

void setup() {
  Serial.begin(115200);
  ThingSpeak.begin(client);
 
  WiFi.mode(WIFI_STA);
  dht.begin();
  pinMode(STEPPIN, OUTPUT);
  pinMode(DIRPIN, OUTPUT);
  pinMode(BUTTONPIN, INPUT_PULLUP);
  digitalWrite(DIRPIN, HIGH);
}

void loop() {
  if (digitalRead(BUTTONPIN) == LOW) {
    motorEnabled = !motorEnabled;
    delay(300);
  }

  float temperature = dht.readTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  if (temperature <= 25) {
    motorSpeed = 2500;
  } else if (temperature <= 40) {
    motorSpeed = 2000;
  } else if (temperature <= 50) {
    motorSpeed = 1500;
  } else if (temperature <= 60) {
    motorSpeed = 1000;
  } else {
    motorSpeed = 500;
  }

  int rpm = 12000000 / motorSpeed;

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, RPM: ");
  Serial.print(rpm);
  Serial.print(", Motor Enabled: ");
  Serial.println(motorEnabled ? "Yes" : "No");

  if (motorEnabled) {
    for (int i = 0; i < 200; i++) {
      digitalWrite(STEPPIN, HIGH);
      delayMicroseconds(motorSpeed);
      digitalWrite(STEPPIN, LOW);
      delayMicroseconds(motorSpeed);
    }
  } else {
    delay(100);
  }
  if(WiFi.status() != WL_CONNECTED) 
  {
  Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(5000);
    }
  Serial.println("\nConnected.");
  }

  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, rpm);

  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);

if(statusCode == 200) { 
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
} 
}