#include <WiFi.h>
#include <ThingSpeak.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber =2090129;
const char * myWriteAPIKey = "7L38XLBW84T0RZF2";
int inputPin = 13;               //PIR SENSOR   
int ledPin = 4;                // choose the pin for the LED
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;    
int statusCode;
void setup()
 {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client);
pinMode(ledPin, OUTPUT); 
pinMode(inputPin, INPUT); //PIR SENSOR
}
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;
    }
  }
Serial.println("-----------");
}
void writeData()
{
ThingSpeak.setField(1,pirState);
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); // data to be uploaded every 15secs
}