Created
September 8, 2023 11:46
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UD-CO2S にシリアル接続して結果をJSONで配信するウェブサーバー
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#!/usr/bin/env python3 | |
import argparse | |
import datetime | |
import json | |
import re | |
import threading | |
from http.server import BaseHTTPRequestHandler, HTTPServer | |
from pathlib import Path | |
import serial | |
class RequestHandler(BaseHTTPRequestHandler): | |
stat = {} | |
def __init__(self, *args, **kwargs): | |
super().__init__(*args, **kwargs) | |
def do_GET(self): | |
self.send_response(200) | |
self.send_header("Content-type", "application/json") | |
self.end_headers() | |
response_json = json.dumps(RequestHandler.stat) | |
self.wfile.write(response_json.encode()) | |
def fix(stat): | |
# https://blog.mono0x.net/2023/09/03/ud-co2s-temperature-and-humidity/ | |
temp0: float = stat["temperature"] | |
temp1: float = temp0 - 4.5 | |
stat["temperature"] = temp1 | |
stat["humidity"] = ( | |
stat["humidity"] | |
* (pow(10, (7.5 * temp0 / (temp0 + 237.3)))) | |
/ (pow(10, (7.5 * (temp1) / ((temp1) + 237.3)))) | |
) | |
return stat | |
def serial_reader(dev: str): | |
# https://gist.github.com/oquno/d07f6dbf8cc760f2534d9914efe79801 | |
regex = re.compile( | |
r"CO2=(?P<co2>\d+),HUM=(?P<hum>\d+\.\d+),TMP=(?P<tmp>-?\d+\.\d+)" | |
) | |
with serial.Serial(dev, 115200, timeout=6) as conn: | |
conn.write("STA\r\n".encode()) | |
ret: str = conn.readline().decode().strip() | |
assert len(ret) > 0 | |
while True: | |
line = conn.readline().decode().strip() | |
m = regex.match(line) | |
if m is not None: | |
stat = { | |
"co2ppm": int(m.group("co2")), | |
"humidity": float(m.group("hum")), | |
"temperature": float(m.group("tmp")), | |
} | |
stat = fix(stat) | |
RequestHandler.stat = { | |
"time": int(datetime.datetime.now().timestamp()), | |
"stat": stat, | |
} | |
# conn.write("STP\r\n") | |
def operation( | |
*, | |
path_in: Path, | |
host: str = "localhost", | |
port: int = 5605, | |
) -> None: | |
dev = str(path_in) | |
server = HTTPServer((host, port), RequestHandler) | |
# シリアル通信を読み取るスレッドを開始 | |
serial_thread = threading.Thread(target=serial_reader, args=(dev,)) | |
serial_thread.daemon = True | |
serial_thread.start() | |
print(f"Starting server on http://{host}:{port}") | |
try: | |
server.serve_forever() | |
except KeyboardInterrupt: | |
pass | |
server.server_close() | |
def get_opts() -> argparse.Namespace: | |
oparser = argparse.ArgumentParser() | |
oparser.add_argument( | |
"--input", "-i", type=Path, default="/dev/ttyACM0", required=False | |
) | |
return oparser.parse_args() | |
def main() -> None: | |
opts = get_opts() | |
operation( | |
path_in=opts.input, | |
) | |
if __name__ == "__main__": | |
main() |
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