• MCU/module: ESP32-S3-WROOM-2-N32R16V
• Recommended framework: Arduino for ESP32 via PlatformIO
• Supply: 3.3 V logic

Ini
[env:esp32-s3-devkitc-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
lib_deps =
  adafruit/RTClib@^2.1.4
  sandeepmistry/CAN@^0.3.1

Cpp
#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <RTClib.h>
#include <CAN.h>

constexpr int PIN_CAN_TX = 4;
constexpr int PIN_CAN_RX = 5;
constexpr int PIN_CAN_STB = 6;
constexpr int PIN_I2C_SDA = 8;
constexpr int PIN_I2C_SCL = 9;
constexpr int PIN_SD_SCK = 10;
constexpr int PIN_SD_MOSI = 11;
constexpr int PIN_SD_MISO = 12;
constexpr int PIN_SD_CS = 13;
constexpr int PIN_USER_BUTTON = 14;
constexpr int PIN_RTC_INT = 15;
constexpr int PIN_STATUS_LED = 21;
constexpr int PIN_UART_TX = 17;
constexpr int PIN_UART_RX = 18;
constexpr int PIN_ADC0 = 1;
constexpr int PIN_ADC1 = 2;

RTC_DS3231 rtc;
SPIClass sdSPI(FSPI);
HardwareSerial PortB(1);

void setup() {
  Serial.begin(115200);
  pinMode(PIN_STATUS_LED, OUTPUT);
  pinMode(PIN_CAN_STB, OUTPUT);
  pinMode(PIN_USER_BUTTON, INPUT);
  digitalWrite(PIN_CAN_STB, LOW); // normal CAN mode

  Wire.begin(PIN_I2C_SDA, PIN_I2C_SCL);
  if (!rtc.begin()) Serial.println("DS3231 not found");

  sdSPI.begin(PIN_SD_SCK, PIN_SD_MISO, PIN_SD_MOSI, PIN_SD_CS);
  if (!SD.begin(PIN_SD_CS, sdSPI)) Serial.println("microSD init failed");

  CAN.setPins(PIN_CAN_RX, PIN_CAN_TX);
  if (!CAN.begin(500E3)) Serial.println("CAN init failed");

  PortB.begin(115200, SERIAL_8N1, PIN_UART_RX, PIN_UART_TX);
  Serial.println("OBD2 logger starter running");
}

void loop() {
  digitalWrite(PIN_STATUS_LED, millis() / 500 % 2);
  int packetSize = CAN.parsePacket();
  if (packetSize) {
    File f = SD.open("/canlog.csv", FILE_APPEND);
    DateTime now = rtc.now();
    if (f) {
      f.printf("%lu,%04d-%02d-%02dT%02d:%02d:%02d,0x%lX,", millis(), now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second(), CAN.packetId());
      while (CAN.available()) f.printf("%02X ", CAN.read());
      f.println();
      f.close();
    }
  }
  delay(5);
}