#include <WiFi.h>
#include "ThingSpeak.h"

const char* ssid = "Wokwi-GUEST"; // simulated network SSID
const char* password = ""; // no password needed for the Wokwi simulated network

WiFiClient client;

unsigned long myChannelNumber = 2592564; // replace with your channel number
const char *myWriteAPIKey = "3BUAHLH709EQJ1EC"; // replace with your write API key

// Time variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000; // 30 seconds

// Variable to hold temperature readings
float temperature;
int outputPin = 34; // GPIO pin for ADC on ESP32

void setup() {
  Serial.begin(115200); // Initialize serial
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  Serial.print("Attempting to connect to SSID: ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000); // Delay for 1 second
    Serial.print(".");
  }

  Serial.println("\nConnected to WiFi");
}

void loop() {
  if ((millis() - lastTime) > timerDelay) {
    int analogValue = analogRead(outputPin);
    float millivolts = (analogValue / 4095.0) * 3300; // ESP32 ADC has a 12-bit resolution
    temperature = millivolts / 10; // Adjust the conversion factor as needed

    Serial.print("Temperature (°C): ");
    Serial.println(temperature);

    int x = ThingSpeak.writeField(myChannelNumber, 1, temperature, myWriteAPIKey);
    if (x == 200) {
      Serial.println("Channel update successful.");
    } else {
      Serial.println("Problem updating channel. HTTP error code " + String(x));
    }

    lastTime = millis();
  }
}