#include <WiFi.h>
#include <ThingSpeak.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber =  2072481;
const char * myWriteAPIKey = "0L3GIZCJMV1N7IYF";
int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
int statusCode;                   
void setup() 
{
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
}

void loop() 
{
  connectToCloud();
  computeData();
  writeData();
  delay(1000);
}
void connectToCloud()
{
  if(WiFi.status() != WL_CONNECTED) 
  {
  Serial.print("Attempting to connect");
  while(WiFi.status() != WL_CONNECTED) 
  {
  WiFi.begin(ssid, pass);
  for(int i=0;i<5;i++) 
  {
  Serial.print(".");
  delay(1000);
}
}
Serial.println("\nConnected.");
}
}
void computeData()
{
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) 
  {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    if (pirState == LOW) 
    {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else 
  {
    digitalWrite(ledPin, LOW); // turn LED OFF
    if (pirState == HIGH) 
    {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}
void writeData()
{
  ThingSpeak.setField(1, val);
  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
  if(statusCode == 200) //successful writing code
  Serial.println("Channel update successful.");
  else
  Serial.println("Problem Writing data. HTTP error code :" +
  String(statusCode));
  delay(15000);
}