/* ESP32 WiFi Scanning example */

#include "WiFi.h"
#define LED 4
#define Button 13

int oldValue = LOW; // default/idle value for pin 13 is low.


void setup() {
  Serial.begin(115200);
  Serial.println("Initializing WiFi...");
  WiFi.mode(WIFI_STA);
  Serial.println("Setup done!");
  
  pinMode(LED, OUTPUT);
  pinMode(Button, INPUT);
}

void loop() {
  int newValue = digitalRead(Button);

  // Check if the value was changed,
  // by comparing it with the previous value.
  if(newValue != oldValue)
  {
    if(newValue == HIGH)
    {
      Serial.println("The button is pressed.");
      digitalWrite(LED, HIGH);
      delay(200);
      digitalWrite(LED, LOW);
      Serial.println("Scanning...");

      // WiFi.scanNetworks will return the number of networks found
      int n = WiFi.scanNetworks();
      Serial.println("Scan done!");

      digitalWrite(LED, HIGH);
      delay(200);
      digitalWrite(LED, LOW);
      delay(200);
      digitalWrite(LED, HIGH);
      delay(200);
      digitalWrite(LED, LOW);

      if (n == 0) {
        Serial.println("No networks found.");
      } else {
        Serial.println();
        Serial.print(n);
        Serial.println(" networks found");
        for (int i = 0; i < n; ++i) {
          // Print SSID and RSSI for each network found
          Serial.print(i + 1);
          Serial.print(": ");
          Serial.print(WiFi.SSID(i));
          Serial.print(" (");
          Serial.print(WiFi.RSSI(i));
          Serial.print(")");
          Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? " " : "*");
          delay(10);
        }
      }
    }
    else
    {
      Serial.println("The button is released.");
    }
    // Remember the value for the next time.
    oldValue = newValue;
  }
  delay(100);
}