#include <WiFi.h>
#include <WiFiClient.h>
#include "ThingSpeak.h"
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber =  2502965;
const char* myApiKey = "BYX3FXOM1GG7LX9";
const char* server = "api.thingspeak.com";
const int triggerPin = 27; 
const int echoPin = 25;    
const int potentiometerPin = 17;
WiFiClient client;

void setup() {
  Serial.begin(115200);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
  
  ThingSpeak.begin(client);
}
void loop() {
  long duration, distance;
  float voltage;

  // Ultrasonic sensor
  pinMode(triggerPin, OUTPUT);
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration * 0.034) / 2;
  // Potentiometer
  voltage = analogRead(potentiometerPin) * (5.0 / 4095.0);

  // Print values to Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm\tPotentiometer Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");

  // Send values to ThingSpeak
  ThingSpeak.setField(1, distance);
  ThingSpeak.setField(2, voltage);
  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  if (x == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  delay(2000); // Update interval
}