I used the sketch example available on Arduino IDE, and the output can be seen in the image I uploaded. I am only using power from the laptop. Since my last purchase, I have been using this ESP 32 for my projects involving several sensors and modules, such as the DHT 22 sensor (connected to GPIO pin 4 and 5V power source), MLX sensor, and I2C LCD (connected to GPIO pins 23, 22, 3.3V for MLX, and 5V for LCD), the SCT-013 sensor module (connected to GPIO pin 33 with a 3.3V power source), and an AC dimmer (ZC pin connected to GPIO 12 and DIM to GPIO 13, 3.3V), with all grounds connected to the same pin. There is indeed a port change, but when I performed the scan, I used a USB 3.2 Gen 2 port with power-off USB charging, adhering to the 5V voltage standard. I also used the Arduino IDE, and I conducted testing both when the ESP was not connected to the components and when the ESP 32 was connected to the components mentioned above.
This is an example of a wifi.scan sketch.
/*
* This sketch demonstrates how to scan WiFi networks.
* The API is based on the Arduino WiFi Shield library, but has significant changes as newer WiFi functions are supported.
* E.g. the return value of `encryptionType()` different because more modern encryption is supported.
*/
#include "WiFi.h"
void setup()
{
Serial.begin(115200);
// Set WiFi to station mode and disconnect from an AP if it was previously connected.
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
Serial.println("Setup done");
}
void loop()
{
Serial.println("Scan start");
// WiFi.scanNetworks will return the number of networks found.
int n = WiFi.scanNetworks();
Serial.println("Scan done");
if (n == 0) {
Serial.println("no networks found");
} else {
Serial.print(n);
Serial.println(" networks found");
Serial.println("Nr | SSID | RSSI | CH | Encryption");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
Serial.printf("%2d",i + 1);
Serial.print(" | ");
Serial.printf("%-32.32s", WiFi.SSID(i).c_str());
Serial.print(" | ");
Serial.printf("%4d", WiFi.RSSI(i));
Serial.print(" | ");
Serial.printf("%2d", WiFi.channel(i));
Serial.print(" | ");
switch (WiFi.encryptionType(i))
{
case WIFI_AUTH_OPEN:
Serial.print("open");
break;
case WIFI_AUTH_WEP:
Serial.print("WEP");
break;
case WIFI_AUTH_WPA_PSK:
Serial.print("WPA");
break;
case WIFI_AUTH_WPA2_PSK:
Serial.print("WPA2");
break;
case WIFI_AUTH_WPA_WPA2_PSK:
Serial.print("WPA+WPA2");
break;
case WIFI_AUTH_WPA2_ENTERPRISE:
Serial.print("WPA2-EAP");
break;
case WIFI_AUTH_WPA3_PSK:
Serial.print("WPA3");
break;
case WIFI_AUTH_WPA2_WPA3_PSK:
Serial.print("WPA2+WPA3");
break;
case WIFI_AUTH_WAPI_PSK:
Serial.print("WAPI");
break;
default:
Serial.print("unknown");
}
Serial.println();
delay(10);
}
}
Serial.println("");
// Delete the scan result to free memory for code below.
WiFi.scanDelete();
// Wait a bit before scanning again.
delay(5000);
}
