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

// WiFi setup
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2388926;
const char *myWriteAPIKey = "A2KMB0D98TQ0TNF7";
int statusCode;
#define PIN_TRIG 26
#define PIN_ECHO 25
unsigned int level = 0;

void setup() {
  Serial.begin(115200);

  // WiFi mode setup
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}

void loop() {
  // WiFi connection setup
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect");
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
  }

  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  float waterLevel = duration/58;  // Water level in centimeters

  Serial.print("Water level: ");
  Serial.print(waterLevel);
  Serial.println(" cm");

  // Write data to ThingSpeak
  ThingSpeak.setField(1, waterLevel);
  statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem Writing data. HTTP error code :" + String(statusCode));
  }

  delay(5000);
}