Documentation

// ESP32-S3 Nano - Wi-Fi Network Scanner
// Install: Boards Manager -> "esp32" by Espressif Systems
// Select Board: "ESP32S3 Dev Module"

#include <WiFi.h>

void setup() {
  Serial.begin(115200);
  delay(1000);

  // Set Wi-Fi to station mode and disconnect from any AP
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.println("ESP32-S3 Nano Wi-Fi Scanner Ready");
}

void loop() {
  Serial.println("Scanning for networks...");
  int n = WiFi.scanNetworks();

  if (n == 0) {
    Serial.println("No networks found");
  } else {
    Serial.print(n);
    Serial.println(" networks found:");
    for (int i = 0; i < n; i++) {
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(" dBm) ");
      Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? "[Open]" : "[Encrypted]");
      delay(10);
    }
  }
  Serial.println();
  delay(5000);
}

// ESP32-S3 Nano - Blink an external LED on D2 (GPIO5)
// Wire LED through a 220 ohm resistor between D2 and GND

const int ledPin = 5;  // D2 = GPIO5

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);
  delay(500);
  digitalWrite(ledPin, LOW);
  delay(500);
}

# ESP32-S3 Nano - Simple BLE Advertiser (MicroPython)
# Flash MicroPython for ESP32-S3 from micropython.org

import bluetooth
import time
from micropython import const

_ADV_TYPE_FLAGS = const(0x01)
_ADV_TYPE_NAME = const(0x09)

def advertising_payload(name):
    payload = bytearray()
    payload += bytes((2, _ADV_TYPE_FLAGS, 0x06))
    name_bytes = name.encode()
    payload += bytes((len(name_bytes) + 1, _ADV_TYPE_NAME)) + name_bytes
    return payload

ble = bluetooth.BLE()
ble.active(True)
ble.gap_advertise(100_000, advertising_payload("ESP32-S3-Nano"))

print("Advertising as 'ESP32-S3-Nano' - scan with any BLE app")

while True:
    time.sleep(1)

# ESP32-S3 Nano - Read an analog value from A0 (GPIO1)
# Connect a potentiometer wiper to A0, ends to 3V3 and GND

from machine import ADC, Pin
import time

adc = ADC(Pin(1))                # A0 = GPIO1
adc.atten(ADC.ATTN_11DB)         # Full 0 - 3.3V range
adc.width(ADC.WIDTH_12BIT)       # 0 - 4095

while True:
    raw = adc.read()
    voltage = raw * 3.3 / 4095
    print("Raw: {:>4}   Voltage: {:.2f} V".format(raw, voltage))
    time.sleep(0.5)