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

const int potentiometerPin = 34;
const int ledPin = 15;

int potentiometerValue = 0;
float potentiometer_Vout = 3.3;

const char *ssid =  "Wokwi-GUEST";
const char *pass =  "";

WiFiClient client;

//thingspeak settings
unsigned long channel = 1913776; //your channel ID number
const char *apiKey = "27Z84VS8877FHW5V"; //your channel write API Key

//int lum, i = 0;

void setup() {  
  pinMode(potentiometerPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);
  delay(10);

  //connect to WiFi
  Serial.print("Connecting to: "); Serial.println(ssid);
  WiFi.begin(ssid, pass);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  Serial.println("\nWiFi connected\n");
  ThingSpeak.begin(client); //initialize ThingSpeak
  
}

void loop() {
  potentiometerValue = analogRead(potentiometerPin);

  // Description: Map data from one range to another.
  // Function prototype: map(value, fromLow, fromHigh, toLow, toHigh)
  int dutyCycle = map(potentiometerValue, 0, 4095, 0, 254);

  int x = ThingSpeak.writeField(channel, 2, dutyCycle, apiKey);
  if (x == 200) {
    Serial.print("Duty Cycle : "); Serial.println(dutyCycle);
    Serial.println("Update to ThingSpeak Successful.");
  }
  else {
    Serial.println("Data " + String(dutyCycle));
    Serial.println("Problem updating data. HTTP error code " + String(x));
  }
  // changing the LED brightness with PWM
  analogWrite(ledPin, dutyCycle);
  delay(3);

  Serial.println("Waiting...\n");
  delay(10000);
}