M5Capsuleを使う

#include <Arduino.h>
#include <M5Unified.h>
#include <EspEasyLED.h>

EspEasyLED *rgbled;

void setup(){
  auto cfg = M5.config();
  M5.begin(cfg);

  rgbled = new EspEasyLED(GPIO_NUM_21, 1, 20);
}

void loop(){
  if(rgbled){
    rgbled->showColor(EspEasyLEDColor::RED);
    delay(1000);

    rgbled->showColor(EspEasyLEDColor::GREEN);
    delay(1000);

    rgbled->showColor(EspEasyLEDColor::BLUE);
    delay(1000);
  }
}

C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp: In member function 'void SPIClass::begin(int8_t, int8_t, int8_t, int8_t)':
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:87:37: error: 'SCK' was not declared in this scope
         _sck = (_spi_num == FSPI) ? SCK : -1;
                                     ^~~
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:87:37: note: suggested alternative: 'SCL'
         _sck = (_spi_num == FSPI) ? SCK : -1;
                                     ^~~
                                     SCL
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:88:38: error: 'MISO' was not declared in this scope
         _miso = (_spi_num == FSPI) ? MISO : -1;
                                      ^~~~
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:89:38: error: 'MOSI' was not declared in this scope
         _mosi = (_spi_num == FSPI) ? MOSI : -1;
                                      ^~~~
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:90:36: error: 'SS' was not declared in this scope
         _ss = (_spi_num == FSPI) ? SS : -1;
                                    ^~
C:/Users/user/.platformio/packages/framework-arduinoespressif32/libraries/SPI/src/SPI.cpp:90:36: note: suggested alternative: 'PS'
         _ss = (_spi_num == FSPI) ? SS : -1;
                                    ^~
                                    PS

static const uint8_t SS = 5;
static const uint8_t MOSI = 23;
static const uint8_t MISO = 19;
static const uint8_t SCK = 18;

A serial exception error occurred: Write timeout
Note: This error originates from pySerial. It is likely not a problem with esptool, but with the hardware connection or drivers.     
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html

#include <Arduino.h>
#include <M5Unified.h>
#include <WiFi.h>
#include <EspEasyLED.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>

const char *ssid = "アクセスポイントのSSID";
const char *pass = "アクセスポイントのパスワード";
const char* server_addr = "ローカルホストのIPアドレス";
const int server_port = 1883;
const char* device_ID = "M5Capsule";
const char* pub_topic = "/capsule";

EspEasyLED *rgbled;

struct IMUData{
  float accX;
  float accY;
  float accZ;
  float gyroX;
  float gyroY;
  float gyroZ;
};
IMUData data;

WiFiClient client;
PubSubClient mqttClient(client);

void connectMqtt(){
  while(!mqttClient.connected()){
    if(mqttClient.connect(device_ID)){
      //正常
      rgbled->showColor(EspEasyLEDColor::GREEN);
    }else{
      //MQTTブローカー未接続
      rgbled->showColor(EspEasyLEDColor::ORANGE);
      delay(500);
    }
  }
}

void mqttLoop(){
  if(!mqttClient.connected()){
    connectMqtt();
  }
  mqttClient.loop();
}

void setup(){
  auto cfg = M5.config();
  M5.begin(cfg);

  rgbled = new EspEasyLED(GPIO_NUM_21, 1, 20);

  WiFi.begin(ssid, pass);
  while(WiFi.status() != WL_CONNECTED){
    //WiFi未接続
    rgbled->showColor(EspEasyLEDColor::RED);
    delay(500);
  }

  mqttClient.setServer(server_addr, server_port);
}

void loop(){
  mqttLoop();

  M5.Imu.getAccel(&data.accX, &data.accY, &data.accZ);
  M5.Imu.getGyro(&data.gyroX, &data.gyroY, &data.gyroZ);
  
  char json[200];
  const size_t capacity = JSON_OBJECT_SIZE(10);
  StaticJsonDocument<capacity> doc;
  doc["accX"] = data.accX;
  doc["accY"] = data.accY;
  doc["accZ"] = data.accZ;
  doc["gyroX"] = data.gyroX;
  doc["gyroY"] = data.gyroY;
  doc["gyroZ"] = data.gyroZ;
  serializeJson(doc, json);
  mqttClient.publish(pub_topic, json);

  delay(100);
}