【自作スマート家電】1階から2階の家族を呼び出せるシステムを作った話

import network
import socket
import time
import ubinascii
from machine import UART, Pin, reset

from pages import home_page

SSID = "あなたのWi-Fi名"
PASSWORD = "あなたのWi-Fiパスワード"

STATIC_IP = "192.168.10.210"
SUBNET = "255.255.255.0"
GATEWAY = "192.168.10.1"
DNS = "8.8.8.8"

VOLUME = 22

uart = UART(0, baudrate=9600, tx=Pin(12), rx=Pin(13))
led = Pin("LED", Pin.OUT)

start_time = time.time()

FILES = {
    1: "お風呂入って",
    2: "降りてきて",
    3: "LINE見て",
}

def dfplayer_cmd(cmd, param=0):
    high = (param >> 8) & 0xFF
    low = param & 0xFF

    packet = bytearray([
        0x7E, 0xFF, 0x06, cmd, 0x00,
        high, low, 0x00, 0x00, 0xEF
    ])

    checksum = 0 - sum(packet[1:7])
    packet[7] = (checksum >> 8) & 0xFF
    packet[8] = checksum & 0xFF

    uart.write(packet)

def set_volume(volume):
    volume = max(0, min(30, volume))
    dfplayer_cmd(0x06, volume)

def play_file(file_num):
    led.on()
    set_volume(VOLUME)
    time.sleep(0.1)
    dfplayer_cmd(0x03, file_num)
    time.sleep(0.3)
    led.off()

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)

    wlan.ifconfig((STATIC_IP, SUBNET, GATEWAY, DNS))
    wlan.connect(SSID, PASSWORD)

    print("Wi-Fi接続中...")

    while not wlan.isconnected():
        time.sleep(0.5)

    print("Wi-Fi接続完了")
    print("IP:", wlan.ifconfig()[0])

    mac = ubinascii.hexlify(wlan.config("mac"), ":").decode()
    print("MAC:", mac)

    return wlan

def ensure_wifi(wlan):
    if wlan.isconnected():
        return True

    print("Wi-Fiが切断されました。再接続します。")
    led.on()

    try:
        wlan.disconnect()
    except:
        pass

    time.sleep(1)
    wlan.connect(SSID, PASSWORD)

    for _ in range(20):
        if wlan.isconnected():
            print("Wi-Fi再接続成功")
            print("IP:", wlan.ifconfig()[0])
            led.off()
            return True
        time.sleep(0.5)

    print("Wi-Fi再接続失敗")
    led.off()
    return False

def send_response(client, body, content_type="text/html; charset=utf-8"):
    client.send("HTTP/1.1 200 OK\r\n")
    client.send("Content-Type: " + content_type + "\r\n")
    client.send("Connection: close\r\n\r\n")
    client.sendall(body)
    client.close()

def start_server(wlan):
    addr = socket.getaddrinfo("0.0.0.0", 80)[0][-1]

    s = socket.socket()
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    s.bind(addr)
    s.listen(1)
    s.settimeout(2)

    print("Webサーバー起動")
    print("http://" + STATIC_IP)

    while True:
        ensure_wifi(wlan)

        try:
            client, addr = s.accept()
        except OSError:
            continue

        try:
            request = client.recv(1024).decode("utf-8")
            print(request)

            if "GET /api/play?file=" in request:
                file_text = request.split("GET /api/play?file=")[1].split(" ")[0]
                file_num = int(file_text)

                if file_num in FILES:
                    send_response(
                        client,
                        '{"ok": true, "file": %d}' % file_num,
                        "application/json; charset=utf-8"
                    )

                    play_file(file_num)
                    continue

                send_response(
                    client,
                    '{"ok": false, "error": "invalid_file"}',
                    "application/json; charset=utf-8"
                )
                continue

            if "GET /api/status" in request:
                uptime = int(time.time() - start_time)
                response = '{"ok": true, "status": "alive", "uptime": %d}' % uptime
                send_response(client, response, "application/json; charset=utf-8")
                continue

            send_response(client, home_page())

        except Exception as e:
            print("エラー:", e)

            try:
                send_response(
                    client,
                    '{"ok": false, "error": "server_error"}',
                    "application/json; charset=utf-8"
                )
            except:
                pass

wlan = connect_wifi()

time.sleep(1)
set_volume(VOLUME)

start_server(wlan)

def home_page():
    return """<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>呼び出しボタン</title>
<style>
body {
  font-family: sans-serif;
  text-align: center;
  padding: 20px;
  background: #f7f7f7;
}

h1 {
  font-size: 32px;
  margin-bottom: 20px;
}

button {
  width: 95%;
  max-width: 500px;
  height: 110px;
  font-size: 34px;
  margin: 14px 0;
  border: none;
  border-radius: 24px;
  background: #1976d2;
  color: white;
}

button:disabled {
  background: #777;
}

#message {
  height: 40px;
  font-size: 24px;
  color: #333;
  margin-top: 20px;
}

.success {
  background: #2e7d32 !important;
}

.error {
  background: #c62828 !important;
}
</style>
</head>
<body>
<h1>呼び出し</h1>

<button onclick="play(1, this)">お風呂入って</button>
<button onclick="play(2, this)">降りてきて</button>
<button onclick="play(3, this)">LINE見て</button>

<p id="message"></p>

<script>
function play(file, button) {
  const message = document.getElementById("message");
  const originalText = button.innerText;

  button.disabled = true;
  button.innerText = "送信中...";
  message.innerText = "";

  fetch("/api/play?file=" + file)
    .then(response => {
      if (!response.ok) {
        throw new Error("送信失敗");
      }
      return response.json();
    })
    .then(data => {
      if (data.ok) {
        button.classList.add("success");
        button.innerText = "送信しました";
        message.innerText = "送信できました";
      } else {
        throw new Error("再生できませんでした");
      }
    })
    .catch(error => {
      button.classList.add("error");
      button.innerText = "失敗しました";
      message.innerText = "もう一度押してください";
    })
    .finally(() => {
      setTimeout(() => {
        button.disabled = false;
        button.classList.remove("success");
        button.classList.remove("error");
        button.innerText = originalText;
        message.innerText = "";
      }, 1500);
    });
}
</script>
</body>
</html>"""