const int trigPin = 5;
const int echoPin = 18;
#define SOUND_SPEED 0.034
long duration;
float distanceCm;
float distanceInch;
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "ThingSpeak.h"
#include <WiFi.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* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2510028;
const char* myApiKey = "URBX13CM75SDWH5M";
const char* server = "api.thingspeak.com";
WiFiClient client;
void setup() {
  Serial.begin(115200); 
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(("SSD1306 allocation failed"));
    for(;;);
  }
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  display.println("Sensor Data:");
  display.display();
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * SOUND_SPEED/2;
  ThingSpeak.setField(1,distanceCm);
  int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);
  if(x == 200){
    Serial.println("Data Pushed!!!!");
  }
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
   display.clearDisplay();
  display.setCursor(0,10);
  display.print("Distance: ");
  display.print(distanceCm, 2);
  display.println("CM");
  display.display();
  delay(1000);
}