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Memo

■プログラム例
■Hello World#include <M5Stack.h>

void setup(){
  M5.begin();
  M5.Lcd.print("Hello World");
}

void loop() {
}
■文字の位置とサイズを指定#include <M5Stack.h>

void setup(){
  M5.begin();

  M5.Lcd.setCursor(40, 60);
  M5.Lcd.setTextSize(3);
  M5.Lcd.print("Hello World");
}

void loop() {
}
■四角形や円を描く#include <M5Stack.h>

void setup(){
  M5.begin();

  M5.Lcd.fillRect(120, 140, 80, 30, WHITE);
  M5.Lcd.fillCircle(90, 80, 10, WHITE);
  M5.Lcd.fillCircle(230, 80, 10, WHITE);
}

void loop() {
}
■ボタンを使用する#include <M5Stack.h>

void setup(){
  M5.begin();
  M5.Lcd.print("Started.");
}

void loop() {
  M5.update();

  if (M5.BtnA.wasPressed()) {
    M5.Lcd.print("Button A was Pressed.");
  } else if (M5.BtnA.pressedFor(1000)) {
    M5.Lcd.print("Button A was Pressed for 1000.");
  }

  if (M5.BtnB.wasPressed()) {
    M5.Lcd.print("Button B was Pressed.");
  } else if (M5.BtnB.pressedFor(1000)) {
    M5.Lcd.print("Button B was Pressed for 1000.");
  }

  if (M5.BtnC.wasPressed()) {
    M5.Lcd.print("Button C was Pressed.");
  } else if (M5.BtnC.pressedFor(1000)) {
    M5.Lcd.print("Button C was Pressed for 1000.");
  }
}
■スピーカーを鳴らす#include <M5Stack.h>

void setup(){
  M5.begin();
  M5.Lcd.print("Started.");
}

void loop() {
  M5.update();

  if (M5.BtnA.wasPressed()) {
    M5.Speaker.tone(262, 200); // ドの音を鳴らす
  } else if (M5.BtnB.wasPressed()) {
    M5.Speaker.tone(330, 200); // ミの音を鳴らす
  } else if (M5.BtnC.wasPressed()) {
    M5.Speaker.tone(392, 200); // ソの音を鳴らす
  }
}
■ヘルツ・秒数・音量を指定して音を鳴らす#include <M5Stack.h>

void setup(){
  M5.begin();
  M5.Lcd.print("Started.");
}

void loop() {
  M5.update();

  if (M5.BtnA.wasPressed()) {
    beep(440, 1000, 2); // 440Hzの音を1秒鳴らす
  } else if (M5.BtnB.wasPressed()) {
    beep(460, 1000, 2); // 460Hzの音を1秒鳴らす
  } else if (M5.BtnC.wasPressed()) {
    beep(480, 1000, 2); // 480Hzの音を1秒鳴らす
  }
}

// ヘルツ・秒数・音量を指定して音を鳴らす
void beep(int freq, int duration, uint8_t volume) {
  int t = 1000000 / freq / 2;
  unsigned long start = millis();
  while ((millis() - start) < duration) {
    dacWrite(SPEAKER_PIN, 0);
    delayMicroseconds(t);
    dacWrite(SPEAKER_PIN, volume);
    delayMicroseconds(t);
  }
  dacWrite(SPEAKER_PIN, 0);
}
■Wi-Fiに接続する

※M5Stackに使われているESP32は、2.4GHz帯にのみ対応している
  接続先を5Ghzにすると、エラーにはならないもののいつまで待っても接続されなかった

#include <M5Stack.h>
#include <WiFi.h>

const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";

void setup(){
  M5.begin();
  M5.Lcd.setTextSize(2);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print('.');
  }

  M5.Lcd.print("\r\nWiFi connected\r\nIP address: ");
  M5.Lcd.println(WiFi.localIP());
}

void loop() {
}
■インターネットから時刻を取得する#include <M5Stack.h>
#include <WiFi.h>

#define JST (3600L * 9)

const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";

void setup(){
  M5.begin();
  M5.Lcd.setTextSize(2);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print('.');
  }

  M5.Lcd.print("\r\nWiFi connected\r\nIP address: ");
  M5.Lcd.println(WiFi.localIP());

  delay(500);

  M5.Lcd.setTextSize(3);
  configTime(JST, 0, "ntp.nict.jp", "time.google.com", "ntp.jst.mfeed.ad.jp");
}

void loop() {
  struct tm tm;
  if (getLocalTime(&tm)) {
    M5.Lcd.fillScreen(BLACK);
    M5.Lcd.setCursor(60, 80);
    M5.Lcd.printf("%d/%2d/%2d", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
    M5.Lcd.setCursor(80, 140);
    M5.Lcd.printf("%02d:%02d:%02d", tm.tm_hour, tm.tm_min, tm.tm_sec);
  }
  delay(1000);
}
■インターネットからテキストを取得する#include <M5Stack.h>
#include <WiFi.h>
#include <HTTPClient.h>

const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";
const char* url = "http://example.com/example.php";

void setup(){
  M5.begin();
  M5.Lcd.setTextSize(2);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print('.');
  }

  M5.Lcd.print("\r\nWiFi connected\r\nIP address: ");
  M5.Lcd.println(WiFi.localIP());

  delay(500);

  M5.Lcd.setTextSize(2);
}

void loop() {
  M5.Lcd.fillScreen(BLACK);
  M5.Lcd.setCursor(0, 0);

  HTTPClient http;
  http.begin(url);
  int httpCode = http.GET();
  if (httpCode == HTTP_CODE_OK) {
    String response = http.getString();

    M5.Lcd.print("Response=" + response);
  } else {
    M5.Lcd.print("Error on HTTP request.");
  }
  http.end();

  delay(10 * 1000);
}
■インターネットから画像を取得する#include <M5Stack.h>
#include <WiFi.h>
#include <HTTPClient.h>

const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";
const char* url = "http://example.com/example.jpg";

uint8_t buff[64 * 1024] = { 0 };

void setup(){
  M5.begin();
  M5.Lcd.setTextSize(2);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print('.');
  }

  M5.Lcd.print("\r\nWiFi connected\r\nIP address: ");
  M5.Lcd.println(WiFi.localIP());

  delay(500);
}

void loop() {
  HTTPClient http;
  http.begin(url);
  int httpCode = http.GET();
  if (httpCode == HTTP_CODE_OK) {
    int len = http.getSize();

    if (len <= 0) {
      M5.Lcd.print("Error on HTTP getSize.");
    } else {
      WiFiClient * stream = http.getStreamPtr();

      uint8_t* p = buff;
      int l = len;
      while (http.connected() && (l > 0 || len == -1)) {
        size_t size = stream->available();
        if (size) {
          int s = ((size > sizeof(buff)) ? sizeof(buff) : size);
          int c = stream->readBytes(p, s);
          p += c;
          Serial.printf("[HTTP] read: %d\n", c);
          if (l > 0) {
            l -= c;
          }
        }
      }
      M5.Lcd.drawJpg(buff, len);
    }
  } else {
    M5.Lcd.print("Error on HTTP request.");
  }
  http.end();

  delay(60 * 1000);
}
■押したボタンに応じて、インターネットから画像を取得する#include <M5Stack.h>
#include <WiFi.h>
#include <HTTPClient.h>

const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";

const char* targetA = "http://example.com/image1.jpg";
const char* targetB = "http://example.com/image2.jpg";
const char* targetC = "http://example.com/image3.jpg";
const char* url = "";
int count = 0;
int interval = 10 * 60;

uint8_t buff[64 * 1024] = { 0 };

void setup(){
  M5.begin();
  M5.Lcd.setTextSize(2);

  // WiFiに接続
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print('.');
  }

  M5.Lcd.print("\r\nWiFi connected\r\nIP address: ");
  M5.Lcd.println(WiFi.localIP());

  delay(500);

  // 初期表示するURL
  url = targetA;
}

void loop() {
  M5.update();

  // ボタンに応じて画像を切り替え
  if (M5.BtnA.wasPressed()) {
    beep(440, 100, 2);

    url   = targetA;
    count = 0;
  } else if (M5.BtnB.wasPressed()) {
    beep(440, 100, 2);
    
    url   = targetB;
    count = 0;
  } else if (M5.BtnC.wasPressed()) {
    beep(440, 100, 2);
    
    url   = targetC;
    count = 0;
  }

  // ウェイト処理
  if (count-- <= 0) {
    count = interval;

    // インターネットから画像を取得して表示
    HTTPClient http;
    http.begin(url);
    int httpCode = http.GET();
    if (httpCode == HTTP_CODE_OK) {
      int len = http.getSize();

      if (len <= 0) {
        M5.Lcd.print("Error on HTTP getSize.");
      } else {
        WiFiClient * stream = http.getStreamPtr();

        uint8_t* p = buff;
        int l = len;
        while (http.connected() && (l > 0 || len == -1)) {
          size_t size = stream->available();
          if (size) {
            int s = ((size > sizeof(buff)) ? sizeof(buff) : size);
            int c = stream->readBytes(p, s);
            p += c;
            Serial.printf("[HTTP] read: %d\n", c);
            if (l > 0) {
              l -= c;
            }
          }
        }
        M5.Lcd.drawJpg(buff, len);
      }
    } else {
      M5.Lcd.print("Error on HTTP request.");
    }
    http.end();
  }

  // 1秒待つ
  delay(1000);
}

// ヘルツ・秒数・音量を指定して音を鳴らす
void beep(int freq, int duration, uint8_t volume) {
  int t = 1000000 / freq / 2;
  unsigned long start = millis();
  while ((millis() - start) < duration) {
    dacWrite(SPEAKER_PIN, 0);
    delayMicroseconds(t);
    dacWrite(SPEAKER_PIN, volume);
    delayMicroseconds(t);
  }
  dacWrite(SPEAKER_PIN, 0);
}
Memo

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