#include <ThingSpeak.h>
#include <WiFi.h>
#include <Wire.h> 
#include <Adafruit_GFX.h> 
#include <Adafruit_SSD1306.h> 

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64 
#define OLED_RESET -1 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server = "api.thingspeak.com";
const char* apiKey = "USMZYYGXVT08O7IL";
WiFiClient client;
int trigPin = 27;
int echoPin = 12;
long duration;
int distance;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(10000);
    Serial.println("WiFi not connected");
  }
  Serial.println("Connected to WiFi");
  ThingSpeak.begin(client);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(2000);
  display.clearDisplay();
  display.display();
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.0343 / 2;
  Serial.print("Distance: ");
  Serial.println(distance);
  ThingSpeak.writeField(2509729, 1, distance, apiKey);

  // Clear the display
  display.clearDisplay();

  // Set text size, color, and print distance value
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Distance:");
  display.setCursor(0, 10);
  display.println(distance);
  display.println(" cm");

  // Display on OLED
  display.display();

  delay(5000); // Wait for 5 seconds before taking another measurement
}