ラズパイで気象衛星ひまわりの画像を表示する装置を作ろう

python3 -m venv ~/myenv --system-site-packages

source myenv/bin/activate

pip install --upgrade pip

pip install adafruit-circuitpython-rgb-display

from board import SCK, MOSI, MISO, D5, D18, D23, D24
from busio import SPI
from digitalio import DigitalInOut, Direction
from adafruit_rgb_display.ili9341 import ILI9341
from PIL import Image, ImageDraw, ImageFont

# Setup GPIO pins for display
CS = DigitalInOut(D5)
DC = DigitalInOut(D24)
RST = DigitalInOut(D23)
BL = DigitalInOut(D18)
BL.direction = Direction.OUTPUT
BL.value = True  # Turn on backlight

# Initialize SPI and display
spi = SPI(clock=SCK, MOSI=MOSI, MISO=MISO)
display = ILI9341(spi, cs=CS, dc=DC, rst=RST, width=240, height=320)

# Create a red image
image = Image.new("RGB", (240, 320), (255, 0, 0))
draw = ImageDraw.Draw(image)

# Load default font
font = ImageFont.load_default()

# Draw text
draw.text((20, 150), "Hello, ILI9341!", font=font, fill=(255, 255, 255))

# Display the image
display.image(image)

import time
import requests
from PIL import Image, ImageDraw
from io import BytesIO

from board import SCK, MOSI, MISO, D5, D18, D23, D24
from busio import SPI
from digitalio import DigitalInOut, Direction
from adafruit_rgb_display.ili9341 import ILI9341

# --- Display setup ---
CS = DigitalInOut(D5)
DC = DigitalInOut(D24)
RST = DigitalInOut(D23)
BL = DigitalInOut(D18)
BL.direction = Direction.OUTPUT
BL.value = True

spi = SPI(clock=SCK, MOSI=MOSI, MISO=MISO)
display = ILI9341(spi, cs=CS, dc=DC, rst=RST, width=240, height=320)

# ひまわりの最新画像を取得する関数
def fetch_image():
    url = "http://agora.ex.nii.ac.jp/digital-typhoon/latest/globe/512x512/ir.jpg"
    try:
        response = requests.get(url, timeout=10)
        response.raise_for_status()
        img = Image.open(BytesIO(response.content)).convert("RGB")
        return img
    except Exception as e:
        print("Fetch failed:", e)
        return None

# 表示用に画像を整形する関数
def prepare_image(img):
    img = img.rotate(90, expand=True) # 表示向きに90度回転 
    img = img.resize((240, 240))      # ディスプレイ用にサイズ変更

    # 円形マスクを作成して地球部分だけを切り抜き
    mask = Image.new("L", (240, 240), 0)
    draw = ImageDraw.Draw(mask)
    draw.ellipse((0, 0, 240, 240), fill=255)

    black_bg = Image.new("RGB", (240, 240), (0, 0, 0))       # 黒背景画像
    earth_only = Image.composite(img, black_bg, mask)        # 円形で切り抜いた画像と合成

    canvas = Image.new("RGB", (240, 320), (0, 0, 0))
    canvas.paste(earth_only, (0, 40))
    return canvas

# --- メインループ ---
last_canvas = None

while True:
    img = fetch_image()
    if img:
        last_canvas = prepare_image(img)
        print("New image fetched and prepared.")
    else:
        print("Using previous image.")

    if last_canvas:
        display.image(last_canvas)

    time.sleep(600)  # 10 minutes

import os
import requests
from datetime import datetime, timedelta, timezone
from PIL import Image
from io import BytesIO
import time

# Constants
IMAGE_DIR = "/home/pi/image"
MAX_IMAGES = 144
INTERVAL = 8 * 60  # 8 minutes

# JST timezone
JST = timezone(timedelta(hours=9))

# Ensure image directory exists
os.makedirs(IMAGE_DIR, exist_ok=True)

# 最新の保存済み画像の時刻を取得する
def get_latest_saved_time():
    files = sorted(f for f in os.listdir(IMAGE_DIR) if f.endswith(".bmp"))
    if not files:
        return None
    latest_file = files[-1]
    try:
        dt = datetime.strptime(latest_file[:13], "%Y%m%d_%H%M")  # ?: "20250612_1530"
        return dt
    except Exception:
        return None

# 指定時刻から取得候補となる「分」のリストを返す（10分刻み）
def generate_valid_minute_slots(base_time_utc, full=False):
    if full:
        return ["50", "40", "30", "20", "10", "00"]
    current_minute = int(base_time_utc.strftime('%M'))
    return [f"{m:02d}" for m in [50, 40, 30, 20, 10, 0] if m <= current_minute]

# 指定された画像を保存する（JSTのタイムスタンプをファイル名に付ける）
def save_image(canvas, jst_dt):
    filename = jst_dt.strftime("%Y%m%d_%H%M") + ".bmp"
    filepath = os.path.join(IMAGE_DIR, filename)
    canvas.save(filepath, format="BMP")
    print(f"Saved: {filepath}\n")

# 古い画像を削除して、最大枚数を超えないようにする
def cleanup_old_images():
    files = sorted(f for f in os.listdir(IMAGE_DIR) if f.endswith(".bmp"))
    print(len(files))
    while len(files) > MAX_IMAGES:
        os.remove(os.path.join(IMAGE_DIR, files[0]))
        print("Deleted:", files[0])
        files.pop(0)

# 指定したUTC時刻をもとに画像を取得し、保存・整理を行う
def try_fetch_and_save(base_time_utc, full_range=False):
    date_str = base_time_utc.strftime('%Y/%m/%d')
    base_date_str = base_time_utc.strftime('%Y%m%d')
    hour_str = base_time_utc.strftime('%H')
    minute_slots = generate_valid_minute_slots(base_time_utc, full=full_range)

    for mnt in minute_slots:
        time_str = f"{base_date_str}{hour_str}{mnt}"
        url = f"http://agora.ex.nii.ac.jp/digital-typhoon/iiif/{date_str}/{time_str}00.tif/0,0,11000,11000/688,/0/default.jpg"

        try:
            response = requests.get(url, timeout=10)
            response.raise_for_status()
            img = Image.open(BytesIO(response.content)).rotate(90, expand=True)
            img = img.resize((240, 240))
            canvas = Image.new("RGB", (240, 320), (0, 0, 0))
            canvas.paste(img, (0, 40))
            jst_dt = datetime.strptime(time_str + "00", "%Y%m%d%H%M%S").replace(tzinfo=timezone.utc).astimezone(JST)
            save_image(canvas, jst_dt)
            cleanup_old_images()
            return True
        except Exception:
            jst_dt = datetime.strptime(time_str + "00", "%Y%m%d%H%M%S").replace(tzinfo=timezone.utc).astimezone(JST)
            print("No data time (JST):", jst_dt.strftime("%Y/%m/%d %H:%M:%S"))
            time.sleep(2)
    return False

# Main loop
while True:
    wait_after_backfill = False

    latest_jst = get_latest_saved_time()
    if latest_jst:
        target_jst = latest_jst - timedelta(minutes=10)
        filename = target_jst.strftime("%Y%m%d_%H%M") + ".bmp"
        filepath = os.path.join(IMAGE_DIR, filename)
        if not os.path.exists(filepath):
            print("Trying backfill for:", filename)
            target_utc = target_jst.astimezone(timezone.utc)
            if try_fetch_and_save(target_utc):
                wait_after_backfill = True

    if wait_after_backfill:
        time.sleep(5)

    now_utc = datetime.now(timezone.utc)
    if not try_fetch_and_save(now_utc):
        print("Retrying with 1 hour earlier...")
        try_fetch_and_save(now_utc - timedelta(hours=1), full_range=True)

    time.sleep(INTERVAL)

url = f"http://agora.ex.nii.ac.jp/digital-typhoon/iiif/{date_str}/{time_str}00.tif/0,0,11000,11000/688,/0/default.jpg"

python3 himawari_image_save.py

import glob
import time
from PIL import Image

from board import SCK, MOSI, MISO, D5, D18, D23, D24
from busio import SPI
from digitalio import DigitalInOut, Direction
from adafruit_rgb_display.ili9341 import ILI9341

# Setup GPIO pins for display
CS = DigitalInOut(D5)
DC = DigitalInOut(D24)
RST = DigitalInOut(D23)
BL = DigitalInOut(D18)
BL.direction = Direction.OUTPUT
BL.value = True  # Turn on backlight

# Initialize SPI and display
spi = SPI(clock=SCK, MOSI=MOSI, MISO=MISO)
display = ILI9341(spi, cs=CS, dc=DC, rst=RST, width=240, height=320)

while True:
    # 画像フォルダからBMPファイルをすべて取得し、名前順に並べる
    image_files = sorted(glob.glob("/home/pi/image/*.bmp"))

    # 画像を1枚ずつ表示
    for filepath in image_files:
        img = Image.open(filepath)
        display.image(img)
        time.sleep(0.01)

    time.sleep(5)  # 5秒待ってから画像リストを再取得（新しい画像が増えている可能性があるため）