• Board: Seeed Studio XIAO ESP32S3
• Framework: Arduino via PlatformIO

Ini
[env:seeed_xiao_esp32s3]
platform = espressif32
board = seeed_xiao_esp32s3
framework = arduino
monitor_speed = 115200
lib_deps =
    adafruit/Adafruit SSD1306@^2.5.13
    adafruit/Adafruit GFX Library@^1.11.11

Cpp
#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "driver/i2s.h"

#define PIN_I2C_SDA       5
#define PIN_I2C_SCL       6
#define PIN_I2S_BCLK      7
#define PIN_I2S_MIC_DOUT  8
#define PIN_I2S_AMP_DIN   9
#define PIN_I2S_LRCLK     44
#define PIN_TOUCH_OUT     1
#define PIN_POT_ADC       2

#define OLED_ADDR         0x3C
#define SCREEN_WIDTH      128
#define SCREEN_HEIGHT     64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setupI2S() {
  // Placeholder I2S setup: exact duplex/audio routing depends on final firmware architecture.
  // Use ESP-IDF I2S std driver or Arduino audio library when implementing real audio pass-through/playback.
}

void setup() {
  Serial.begin(115200);
  delay(500);

  pinMode(PIN_TOUCH_OUT, INPUT);
  pinMode(PIN_POT_ADC, INPUT);

  Wire.begin(PIN_I2C_SDA, PIN_I2C_SCL);

  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    Serial.println("OLED not found");
  } else {
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.println("Smart Glasses");
    display.println("XIAO ESP32-S3");
    display.display();
  }

  setupI2S();
  Serial.println("Init complete");
}

void loop() {
  int touchState = digitalRead(PIN_TOUCH_OUT);
  int potRaw = analogRead(PIN_POT_ADC);

  Serial.printf("touch=%d pot=%d\n", touchState, potRaw);

  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("Smart Glasses");
  display.printf("Touch: %d\n", touchState);
  display.printf("Pot: %d\n", potRaw);
  display.display();

  delay(250);
}

• I2S mic and I2S amplifier share BCLK and LRCLK, but use separate data pins.
• Full real-time audio pass-through needs a firmware audio buffer/task; the starter code verifies GPIO, ADC, I2C OLED, and basic boot.