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>
92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
'''
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Live read of the AMS CCS811 air-quality sensor (used by the web "Get Data" button).
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Prints a JSON object: {"eCO2": <int_ppm>, "TVOC": <int_ppb>} or {"error": "<message>"}.
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CCS811 is a MOX gas sensor: it outputs an equivalent CO2 (eCO2, derived from VOCs)
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and a Total VOC (TVOC). It is NOT an NDIR CO2 sensor like the S88. TVOC is the
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primary measurement of interest here.
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I2C, library adafruit-circuitpython-ccs811. Address read from config_table
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(key CCS811_address, e.g. "0x5A" Adafruit / "0x5B" SparkFun), default 0x5A.
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Usage: /usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/get_data.py [address]
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'''
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import json
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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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# CCS811 produces a fresh sample every 1 s in drive mode 1. Poll data_ready a few
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# times to cover the case where the driver was just (re)initialised.
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DATA_READY_RETRIES = 30
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DATA_READY_DELAY = 0.2 # seconds
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def get_address_from_config():
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try:
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conn = sqlite3.connect(DB_PATH)
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cursor = conn.cursor()
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cursor.execute("SELECT value FROM config_table WHERE key = ?", ("CCS811_address",))
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row = cursor.fetchone()
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conn.close()
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if row and row[0]:
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return int(str(row[0]), 16)
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except Exception:
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pass
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return DEFAULT_ADDRESS
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def main():
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if len(sys.argv) > 1:
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try:
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address = int(sys.argv[1], 16)
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except ValueError:
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print(json.dumps({"error": f"invalid address {sys.argv[1]}"}))
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return
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else:
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address = get_address_from_config()
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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(json.dumps({"error": f"library import failed: {e}"}))
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return
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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(json.dumps({"error": f"cannot init CCS811 at {hex(address)}: {e}"}))
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return
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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(json.dumps({"error": "CCS811 data not ready (warming up?)"}))
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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 floor is 400 ppm; a sub-400 value is a not-yet-settled sample.
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if eco2 < 400:
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print(json.dumps({"error": "CCS811 reading not settled (warming up?)"}))
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return
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print(json.dumps({"eCO2": eco2, "TVOC": tvoc}))
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except Exception as e:
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print(json.dumps({"error": f"CCS811 read error: {e}"}))
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if __name__ == "__main__":
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main()
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