46c73acb7e
Découvert en vérif SSH sur nebuleair-pro100 : le timer CCS811 échouait en ModuleNotFoundError car l'OTA fait git pull mais ne réinstallait jamais les dépendances pip (installation_part1.sh ne tourne qu'à l'install neuve). - requirements.txt: source unique de vérité des deps Python - installation_part1.sh: install via requirements.txt (chemin relatif au script, le repo n'est pas encore cloné dans /var/www à cette étape) - update_firmware.sh: nouvelle étape 2a, pip install -r requirements.txt (idempotent) -> les capteurs déjà déployés récupèrent les libs manquantes à l'OTA - CCS811/write_data.py + get_data.py: skip des lectures eCO2 < 400 ppm (échantillon 0/0 parasite juste après init du driver, plancher physique = 400) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
106 lines
3.0 KiB
Python
106 lines
3.0 KiB
Python
'''
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Script to get air-quality values from the AMS CCS811 sensor and write to database.
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/usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/write_data.py
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CCS811 is a MOX gas sensor: eCO2 (equivalent CO2 in ppm, derived from VOCs) and
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TVOC (Total VOC in ppb). TVOC is the primary measurement of interest.
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I2C, library adafruit-circuitpython-ccs811. Address from config_table
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(key CCS811_address, e.g. "0x5A" / "0x5B"), default 0x5A.
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'''
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import sqlite3
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import sys
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import time
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DB_PATH = "/var/www/nebuleair_pro_4g/sqlite/sensors.db"
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DEFAULT_ADDRESS = 0x5A
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DATA_READY_RETRIES = 30
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DATA_READY_DELAY = 0.2 # seconds
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def get_config(cursor, key, default):
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cursor.execute("SELECT value FROM config_table WHERE key = ?", (key,))
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row = cursor.fetchone()
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return row[0] if row else default
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def main():
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conn = sqlite3.connect(DB_PATH)
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cursor = conn.cursor()
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# Self-heal: ensure the table exists even if create_db.py was skipped during OTA.
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# Duplicates the canonical schema from sqlite/create_db.py — keep them in sync.
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cursor.execute("""
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CREATE TABLE IF NOT EXISTS data_CCS811 (
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timestamp TEXT,
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eCO2 INTEGER,
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TVOC INTEGER
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)
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""")
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conn.commit()
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addr_str = get_config(cursor, "CCS811_address", "0x5A")
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try:
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address = int(str(addr_str), 16)
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except ValueError:
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address = DEFAULT_ADDRESS
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try:
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import board
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import busio
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import adafruit_ccs811
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except Exception as e:
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print(f"CCS811: library import failed: {e}")
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conn.close()
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sys.exit(1)
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try:
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i2c = busio.I2C(board.SCL, board.SDA)
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ccs811 = adafruit_ccs811.CCS811(i2c, address=address)
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except Exception as e:
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print(f"CCS811: cannot init at {hex(address)}: {e}")
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conn.close()
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sys.exit(1)
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try:
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ready = False
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for _ in range(DATA_READY_RETRIES):
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if ccs811.data_ready:
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ready = True
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break
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time.sleep(DATA_READY_DELAY)
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if not ready:
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print("CCS811: data not ready (warming up?), skipping.")
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return
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eco2 = int(ccs811.eco2)
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tvoc = int(ccs811.tvoc)
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# eCO2 has a physical floor of 400 ppm. Just after the driver (re)inits,
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# the CCS811 can return a 0/0 sample before its first valid measurement is
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# ready — those are spurious, drop them (next 10 s tick will retry).
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if eco2 < 400:
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print(f"CCS811: reading not settled (eCO2={eco2}), skipping.")
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return
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cursor.execute("SELECT last_updated FROM timestamp_table LIMIT 1")
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row = cursor.fetchone()
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rtc_time_str = row[0]
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cursor.execute(
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"INSERT INTO data_CCS811 (timestamp, eCO2, TVOC) VALUES (?, ?, ?)",
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(rtc_time_str, eco2, tvoc),
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)
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conn.commit()
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print(f"eCO2: {eco2} ppm, TVOC: {tvoc} ppb (saved at {rtc_time_str})")
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except Exception as e:
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print(f"CCS811 error: {e}")
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finally:
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conn.close()
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if __name__ == "__main__":
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main()
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