This project demonstrates how to scan for available WiFi networks using an ESP32 microcontroller. We'll use the Wokwi online simulator, so you don't need any physical hardware to get started!
Network Scanning
Detect nearby WiFi networks
Signal Strength
View RSSI values
Security Detection
Identify encryption types
No Hardware Needed
Runs in Wokwi simulator
What is Wokwi?
Wokwi is a free online simulator for Arduino, ESP32, and other microcontrollers. It allows you to:
- Write and test code without physical hardware
- Simulate WiFi, sensors, and other components
- Share projects with a simple link
- Debug code in real-time
- Learn electronics safely
Expected Output
WiFi Scanner Starting... Scan starting... Scan complete! Found 3 networks: 1: Wokwi-GUEST (Open) Signal: -42 dBm ▂▄▆█ Channel: 6 2: MyHomeNetwork (WPA2) Signal: -67 dBm ▂▄__ Channel: 11 3: Office-5G (WPA2) Signal: -78 dBm ▂___ Channel: 1 ------------------------------------ Scanning again in 5 seconds...
CODE:
/* ESP32 WiFi Scanning example */
#include "WiFi.h"
void setup() {
Serial.begin(115200);
Serial.println("Initializing WiFi...");
WiFi.mode(WIFI_STA);
Serial.println("Setup done!");
}
void loop() {
Serial.println("Scanning...");
// 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.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);
}
}
Serial.println("");
// Wait a bit before scanning again
delay(5000);
}
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