v1.10.0: intégration capteur CCS811 (TVOC/eCO2, I2C)

Nouveau capteur de qualité d'air CCS811 sur le bus I2C, calqué sur le pattern S88 (local-only, pas encore dans le payload de transmission). - CCS811/get_data.py (lecture live) + write_data.py (timer 10s, self-heal table) - table data_CCS811 (timestamp, eCO2, TVOC) dans create_db.py - config CCS811 (bool) + CCS811_address (0x5A/0x5B, défaut 0x5A) dans set_config.py - service+timer systemd nebuleair-ccs811-data (10s) + ajout boucle d'activation - admin.html: case d'activation + dropdown adresse I2C - sensors.html: carte Get Data (TVOC + eCO2) - database.html + launcher.php: consultation/export/stats data_CCS811 - lib adafruit-circuitpython-ccs811 dans installation_part1.sh - CCS811/README.md: câblage, adresses, warning clock-stretching I2C sur Pi - CLAUDE.md + changelog mis à jour Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-02 14:27:11 +02:00
parent 4767b145b2
commit 4f3d273981
14 changed files with 455 additions and 9 deletions
--- a/CCS811/README.md
+++ b/CCS811/README.md
@@ -0,0 +1,83 @@
+# CCS811 — Capteur qualité d'air (eCO2 / TVOC)
+
+Capteur de gaz **MOX** (oxyde métallique) AMS CCS811. Connecté en **I2C**.
+
+## ⚠ À lire avant de câbler
+
+Le CCS811 **n'est pas** un capteur CO2 NDIR comme le Senseair S88. C'est un capteur
+de COV (composés organiques volatils) qui mesure :
+
+- **TVOC** (Total Volatile Organic Compounds) — en **ppb**. C'est la mesure réellement
+  utile / fiable du capteur, et celle qui nous intéresse ici.
+- **eCO2** (CO2 *équivalent*) — en **ppm**, plage 400–8192. Valeur *calculée* à partir
+  du TVOC par un algorithme interne, ce **n'est pas** une mesure directe du CO2. Pour
+  un vrai CO2, utiliser le S88. On stocke quand même l'eCO2 (gratuit, vient de la même
+  lecture) mais ne pas le confondre avec une mesure NDIR.
+
+## ⚠ Clock-stretching I2C sur Raspberry Pi
+
+Le CCS811 utilise massivement le **clock-stretching** I2C. Le contrôleur I2C matériel
+du Raspberry Pi (BSC) gère **mal** le clock-stretching (bug matériel documenté). Sans
+mitigation, les lectures échouent typiquement en `OSError` / `Remote I/O error`.
+
+**Mitigation** : ralentir le bus I2C dans `/boot/firmware/config.txt` :
+
+```
+dtparam=i2c_arm_baudrate=10000
+```
+
+(10 kHz au lieu de 100 kHz par défaut.) Reboot ensuite. À valider au bench — sur
+certains modules/CM4 ça passe à 100 kHz, sur d'autres non.
+
+Vérifier la présence du capteur :
+
+```bash
+sudo i2cdetect -y 1   # doit montrer 5a (ou 5b selon la broche ADDR)
+```
+
+## Adresse I2C
+
+- **0x5A** : ADDR à GND — défaut des breakouts **Adafruit**. Valeur par défaut du firmware.
+- **0x5B** : ADDR à VDD — défaut des breakouts **SparkFun** / modules génériques.
+
+Configurable dans `admin.html` (clé config `CCS811_address`, dropdown 0x5A / 0x5B).
+
+## Câblage I2C
+
+| CCS811 | Raspberry Pi |
+|---|---|
+| VCC / VIN | 3.3V |
+| GND | GND |
+| SDA | SDA (GPIO2) |
+| SCL | SCL (GPIO3) |
+| WAK / nWAKE | GND (réveil permanent ; sinon laisser le module gérer) |
+| ADDR | GND → 0x5A, VDD → 0x5B |
+
+⚠ La plupart des breakouts CCS811 sont en **3.3V** logique. Ne pas alimenter en 5V
+sans level-shifter sauf si le module embarque son propre régulateur + shifter.
+
+## Burn-in / conditionnement
+
+- **Burn-in initial** : ~48 h de fonctionnement continu avant des valeurs stables (1ère mise en service).
+- **Warm-up** à chaque démarrage : ~20 min pour des valeurs fiables. Au démarrage le
+  capteur renvoie souvent eCO2=400 ppm / TVOC=0 ppb (valeurs de repos).
+
+## Implémentation NebuleAir
+
+- `CCS811/get_data.py` — lecture live (bouton "Get Data" du web). Affiche
+  `{"eCO2": <ppm>, "TVOC": <ppb>}` ou `{"error": "..."}`.
+- `CCS811/write_data.py` — lecture périodique (timer systemd, toutes les 10 s),
+  écrit dans la table `data_CCS811 (timestamp, eCO2, TVOC)`.
+
+Librairie Python : `adafruit-circuitpython-ccs811` (installée par
+`installation_part1.sh`). La table est créée par `sqlite/create_db.py` et
+self-healée par `write_data.py` (CREATE TABLE IF NOT EXISTS) — garder les deux
+schémas synchro.
+
+Activation : `admin.html` → case "Send VOC sensor data (CCS811)".
+
+### Pistes d'amélioration (non implémentées)
+
+Le CCS811 supporte une compensation température/humidité (`SET_ENV_DATA`). Comme le
+boîtier embarque déjà un BME280, on pourrait lui pousser temp/hum à chaque lecture
+pour améliorer la précision. Non fait en v1 pour garder le script simple et autonome.
--- a/CCS811/get_data.py
+++ b/CCS811/get_data.py
@@ -0,0 +1,87 @@
+'''
+Live read of the AMS CCS811 air-quality sensor (used by the web "Get Data" button).
+Prints a JSON object: {"eCO2": <int_ppm>, "TVOC": <int_ppb>} or {"error": "<message>"}.
+
+CCS811 is a MOX gas sensor: it outputs an equivalent CO2 (eCO2, derived from VOCs)
+and a Total VOC (TVOC). It is NOT an NDIR CO2 sensor like the S88. TVOC is the
+primary measurement of interest here.
+
+I2C, library adafruit-circuitpython-ccs811. Address read from config_table
+(key CCS811_address, e.g. "0x5A" Adafruit / "0x5B" SparkFun), default 0x5A.
+
+Usage: /usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/get_data.py [address]
+'''
+
+import json
+import sqlite3
+import sys
+import time
+
+DB_PATH = "/var/www/nebuleair_pro_4g/sqlite/sensors.db"
+DEFAULT_ADDRESS = 0x5A
+# CCS811 produces a fresh sample every 1 s in drive mode 1. Poll data_ready a few
+# times to cover the case where the driver was just (re)initialised.
+DATA_READY_RETRIES = 30
+DATA_READY_DELAY = 0.2  # seconds
+
+
+def get_address_from_config():
+    try:
+        conn = sqlite3.connect(DB_PATH)
+        cursor = conn.cursor()
+        cursor.execute("SELECT value FROM config_table WHERE key = ?", ("CCS811_address",))
+        row = cursor.fetchone()
+        conn.close()
+        if row and row[0]:
+            return int(str(row[0]), 16)
+    except Exception:
+        pass
+    return DEFAULT_ADDRESS
+
+
+def main():
+    if len(sys.argv) > 1:
+        try:
+            address = int(sys.argv[1], 16)
+        except ValueError:
+            print(json.dumps({"error": f"invalid address {sys.argv[1]}"}))
+            return
+    else:
+        address = get_address_from_config()
+
+    try:
+        import board
+        import busio
+        import adafruit_ccs811
+    except Exception as e:
+        print(json.dumps({"error": f"library import failed: {e}"}))
+        return
+
+    try:
+        i2c = busio.I2C(board.SCL, board.SDA)
+        ccs811 = adafruit_ccs811.CCS811(i2c, address=address)
+    except Exception as e:
+        print(json.dumps({"error": f"cannot init CCS811 at {hex(address)}: {e}"}))
+        return
+
+    try:
+        ready = False
+        for _ in range(DATA_READY_RETRIES):
+            if ccs811.data_ready:
+                ready = True
+                break
+            time.sleep(DATA_READY_DELAY)
+
+        if not ready:
+            print(json.dumps({"error": "CCS811 data not ready (warming up?)"}))
+            return
+
+        eco2 = ccs811.eco2
+        tvoc = ccs811.tvoc
+        print(json.dumps({"eCO2": int(eco2), "TVOC": int(tvoc)}))
+    except Exception as e:
+        print(json.dumps({"error": f"CCS811 read error: {e}"}))
+
+
+if __name__ == "__main__":
+    main()
--- a/CCS811/write_data.py
+++ b/CCS811/write_data.py
@@ -0,0 +1,98 @@
+'''
+Script to get air-quality values from the AMS CCS811 sensor and write to database.
+/usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/write_data.py
+
+CCS811 is a MOX gas sensor: eCO2 (equivalent CO2 in ppm, derived from VOCs) and
+TVOC (Total VOC in ppb). TVOC is the primary measurement of interest.
+
+I2C, library adafruit-circuitpython-ccs811. Address from config_table
+(key CCS811_address, e.g. "0x5A" / "0x5B"), default 0x5A.
+'''
+
+import sqlite3
+import sys
+import time
+
+DB_PATH = "/var/www/nebuleair_pro_4g/sqlite/sensors.db"
+DEFAULT_ADDRESS = 0x5A
+DATA_READY_RETRIES = 30
+DATA_READY_DELAY = 0.2  # seconds
+
+
+def get_config(cursor, key, default):
+    cursor.execute("SELECT value FROM config_table WHERE key = ?", (key,))
+    row = cursor.fetchone()
+    return row[0] if row else default
+
+
+def main():
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Self-heal: ensure the table exists even if create_db.py was skipped during OTA.
+    # Duplicates the canonical schema from sqlite/create_db.py — keep them in sync.
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS data_CCS811 (
+            timestamp TEXT,
+            eCO2 INTEGER,
+            TVOC INTEGER
+        )
+    """)
+    conn.commit()
+
+    addr_str = get_config(cursor, "CCS811_address", "0x5A")
+    try:
+        address = int(str(addr_str), 16)
+    except ValueError:
+        address = DEFAULT_ADDRESS
+
+    try:
+        import board
+        import busio
+        import adafruit_ccs811
+    except Exception as e:
+        print(f"CCS811: library import failed: {e}")
+        conn.close()
+        sys.exit(1)
+
+    try:
+        i2c = busio.I2C(board.SCL, board.SDA)
+        ccs811 = adafruit_ccs811.CCS811(i2c, address=address)
+    except Exception as e:
+        print(f"CCS811: cannot init at {hex(address)}: {e}")
+        conn.close()
+        sys.exit(1)
+
+    try:
+        ready = False
+        for _ in range(DATA_READY_RETRIES):
+            if ccs811.data_ready:
+                ready = True
+                break
+            time.sleep(DATA_READY_DELAY)
+
+        if not ready:
+            print("CCS811: data not ready (warming up?), skipping.")
+            return
+
+        eco2 = int(ccs811.eco2)
+        tvoc = int(ccs811.tvoc)
+
+        cursor.execute("SELECT last_updated FROM timestamp_table LIMIT 1")
+        row = cursor.fetchone()
+        rtc_time_str = row[0]
+
+        cursor.execute(
+            "INSERT INTO data_CCS811 (timestamp, eCO2, TVOC) VALUES (?, ?, ?)",
+            (rtc_time_str, eco2, tvoc),
+        )
+        conn.commit()
+        print(f"eCO2: {eco2} ppm, TVOC: {tvoc} ppb (saved at {rtc_time_str})")
+    except Exception as e:
+        print(f"CCS811 error: {e}")
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    main()
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -23,6 +23,7 @@ NebuleAir Pro 4G is an environmental monitoring system running on Raspberry Pi 4
 - NSRT MK4: Noise sensor via I2C (0x48)
 - SARA R4/R5: 4G cellular modem (ttyAMA2)
 - Senseair S88: CO2 sensor via Modbus RTU (any free ttyAMA — port configurable, see admin.html)
+- CCS811: air-quality MOX sensor (TVOC + eCO2) via I2C (0x5A or 0x5B, configurable). Note: eCO2 is *derived* from VOCs, not a true NDIR CO2 measurement like the S88.
 - Wind meter: via ADS1115 ADC
 - MPPT: Solar charger monitoring

@@ -49,6 +50,7 @@ When adding a new UART sensor (e.g. S88), it goes on one of the free NPM connect
 - `NPM/`: NextPM sensor scripts
 - `envea/`: Envea sensor scripts
 - `BME280/`: BME280 sensor scripts
+- `CCS811/`: CCS811 air-quality sensor scripts (TVOC/eCO2, I2C)
 - `sound_meter/`: Noise sensor code (C program)
 - `SARA/`: 4G modem communication (AT commands)
 - `windMeter/`: Wind sensor scripts
@@ -102,6 +104,7 @@ sudo /var/www/nebuleair_pro_4g/services/setup_services.sh
 - `nebuleair-envea-data.timer`: Every 10 seconds (Envea sensors)
 - `nebuleair-sara-data.timer`: Every 60 seconds (4G data transmission)
 - `nebuleair-bme280-data.timer`: Every 120 seconds (BME280 sensor)
+- `nebuleair-ccs811-data.timer`: Every 10 seconds (CCS811 TVOC/eCO2 sensor)
 - `nebuleair-mppt-data.timer`: Every 120 seconds (MPPT charger)
 - `nebuleair-noise-data.timer`: Every 60 seconds (Noise sensor)
 - `nebuleair-db-cleanup-data.timer`: Daily (database cleanup)
--- a/2
+++ b/2
@@ -1 +1 @@
-1.9.19
+1.10.0
--- a/changelog.json
+++ b/changelog.json
@@ -1,5 +1,18 @@
 {
  "versions": [
+    {
+      "version": "1.10.0",
+      "date": "2026-06-02",
+      "changes": {
+        "features": [
+          "Intégration du capteur de qualité d'air CCS811 (I2C). Mesure TVOC (ppb, mesure principale) + eCO2 (ppm, dérivé des COV — PAS un vrai CO2 NDIR comme le S88). Nouveau dossier CCS811/ (get_data.py lecture live + write_data.py timer). Table data_CCS811 (timestamp, eCO2, TVOC). Timer systemd toutes les 10 s. Activation + adresse I2C (0x5A Adafruit / 0x5B SparkFun, défaut 0x5A) configurables dans admin.html. Carte 'Get Data' dans sensors.html, consultation/export dans database.html. Lib adafruit-circuitpython-ccs811 ajoutée à installation_part1.sh."
+        ],
+        "improvements": [],
+        "fixes": [],
+        "compatibility": []
+      },
+      "notes": "⚠ Matériel : le CCS811 utilise le clock-stretching I2C que le contrôleur du Pi gère mal (bug BSC). Prévoir 'dtparam=i2c_arm_baudrate=10000' dans config.txt si les lectures échouent en I/O error — à valider au bench. Voir CCS811/README.md. Schéma data_CCS811 dupliqué dans write_data.py (self-heal CREATE IF NOT EXISTS) et create_db.py — garder synchro. CCS811 pas encore intégré au payload de transmission (local-only, comme le S88)."
+    },
    {
      "version": "1.9.19",
      "date": "2026-06-01",
--- a/html/admin.html
+++ b/html/admin.html
@@ -154,6 +154,20 @@
                </div>
              </div>

+              <div class="form-check mb-3">
+                <input class="form-check-input" type="checkbox" value="" id="check_ccs811" onchange="update_config_sqlite('CCS811', this.checked)">
+                <label class="form-check-label" for="check_ccs811">
+                  Send VOC sensor data (CCS811)
+                </label>
+                <div class="mt-2 ms-4" style="max-width: 250px;">
+                  <label for="ccs811_address" class="form-label small mb-1">Adresse I2C du capteur CCS811</label>
+                  <select class="form-select form-select-sm" id="ccs811_address" onchange="update_config_sqlite('CCS811_address', this.value)">
+                    <option value="0x5A">0x5A (Adafruit, ADDR=GND)</option>
+                    <option value="0x5B">0x5B (SparkFun, ADDR=VDD)</option>
+                  </select>
+                </div>
+              </div>
+
              <div class="form-check mb-3">
                <input class="form-check-input" type="checkbox" value="" id="check_wifi_power_saving" onchange="update_config_sqlite('wifi_power_saving', this.checked)">
                <label class="form-check-label" for="check_wifi_power_saving">
@@ -596,6 +610,7 @@ window.onload = function() {
      const checkbox_noise = document.getElementById("check_NOISE");
      const checkbox_mhz19 = document.getElementById("check_mhz19");
      const checkbox_s88 = document.getElementById("check_s88");
+      const checkbox_ccs811 = document.getElementById("check_ccs811");
      const checkbox_wifi_power_saving = document.getElementById("check_wifi_power_saving");

      checkbox_bme.checked = response["BME280"];
@@ -609,6 +624,10 @@ window.onload = function() {
      if (response["S88_port"]) {
        document.getElementById("s88_port").value = response["S88_port"];
      }
+      checkbox_ccs811.checked = response["CCS811"];
+      if (response["CCS811_address"]) {
+        document.getElementById("ccs811_address").value = response["CCS811_address"];
+      }
      checkbox_wifi_power_saving.checked = response["wifi_power_saving"];

      checkbox_uSpot.checked = response["send_uSpot"];
--- a/html/database.html
+++ b/html/database.html
@@ -75,6 +75,7 @@
                <button class="btn btn-primary mb-2" onclick="openTableModal('data_MPPT','Batterie')" data-i18n="database.battery">Batterie</button>
                <button class="btn btn-primary mb-2" onclick="openTableModal('data_MHZ19','Mesures CO2 (MH-Z19)')">Mesures CO2 (MH-Z19)</button>
                <button class="btn btn-primary mb-2" onclick="openTableModal('data_S88','Mesures CO2 (Senseair S88)')">Mesures CO2 (Senseair S88)</button>
+                <button class="btn btn-primary mb-2" onclick="openTableModal('data_CCS811','Mesures TVOC/eCO2 (CCS811)')">Mesures TVOC/eCO2 (CCS811)</button>
                <button class="btn btn-warning mb-2" onclick="openTableModal('timestamp_table','Timestamp Table')" data-i18n="database.timestampTable">Timestamp Table</button>
              </div>
            </div>
@@ -100,6 +101,7 @@
                <button class="btn btn-primary mb-2" onclick="downloadByDate('data_mppt')" data-i18n="database.battery">Batterie</button>
                <button class="btn btn-primary mb-2" onclick="downloadByDate('data_MHZ19')">Mesures CO2 (MH-Z19)</button>
                <button class="btn btn-primary mb-2" onclick="downloadByDate('data_S88')">Mesures CO2 (Senseair S88)</button>
+                <button class="btn btn-primary mb-2" onclick="downloadByDate('data_CCS811')">Mesures TVOC/eCO2 (CCS811)</button>
              </div>
            </div>
          </div>
@@ -117,6 +119,7 @@
                <button class="btn btn-success mb-2" onclick="downloadFullTable('data_MPPT')" data-i18n="database.battery">Batterie</button>
                <button class="btn btn-success mb-2" onclick="downloadFullTable('data_MHZ19')">Mesures CO2 (MH-Z19)</button>
                <button class="btn btn-success mb-2" onclick="downloadFullTable('data_S88')">Mesures CO2 (Senseair S88)</button>
+                <button class="btn btn-success mb-2" onclick="downloadFullTable('data_CCS811')">Mesures TVOC/eCO2 (CCS811)</button>
              </div>
            </div>
          </div>
@@ -320,7 +323,8 @@ function buildTableHeader(table) {
        data_MPPT: ['Timestamp','Battery Voltage','Battery Current','solar_voltage','solar_power','charger_status'],
        data_NOISE: ['Timestamp','Curent LEQ','DB_A_value','Status'],
        data_MHZ19: ['Timestamp','CO2 (ppm)'],
-        data_S88: ['Timestamp','CO2 (ppm)']
+        data_S88: ['Timestamp','CO2 (ppm)'],
+        data_CCS811: ['Timestamp','eCO2 (ppm)','TVOC (ppb)']
    };
    return (headers[table] || ['Data']).map(h => `<th>${h}</th>`).join('');
 }
@@ -343,7 +347,7 @@ function buildTableRow(table, columns) {
        return `<td>${columns[1]}</td>`;
    }
    // Default: render all available columns
-    const colCount = { data_BME280: 4, data_NPM_5channels: 6, data_envea: 6, data_WIND: 3, data_MPPT: 6, data_MHZ19: 2, data_S88: 2 };
+    const colCount = { data_BME280: 4, data_NPM_5channels: 6, data_envea: 6, data_WIND: 3, data_MPPT: 6, data_MHZ19: 2, data_S88: 2, data_CCS811: 3 };
    const n = colCount[table] || columns.length;
    return columns.slice(0, n).map(c => `<td>${c}</td>`).join('');
 }
@@ -485,6 +489,9 @@ function downloadCSV(response, table) {
    else if (table === "data_S88") {
        csvContent += "TimestampUTC,CO2_ppm\n";
    }
+    else if (table === "data_CCS811") {
+        csvContent += "TimestampUTC,eCO2_ppm,TVOC_ppb\n";
+    }

    // Format rows as CSV
    rows.forEach(row => {
@@ -513,7 +520,8 @@ const tableDisplayNames = {
    'data_MPPT': 'Batterie (MPPT)',
    'data_NOISE': 'Bruit',
    'data_MHZ19': 'CO2 (MH-Z19)',
-    'data_S88': 'CO2 (Senseair S88)'
+    'data_S88': 'CO2 (Senseair S88)',
+    'data_CCS811': 'TVOC/eCO2 (CCS811)'
 };

 function loadDbStats() {
--- a/html/launcher.php
+++ b/html/launcher.php
@@ -794,7 +794,7 @@ if ($type == "db_table_stats") {
            $fileSizeMB = round($fileSizeBytes / (1024 * 1024), 2);

            // Sensor data tables to inspect
-            $tables = ['data_NPM', 'data_NPM_5channels', 'data_BME280', 'data_envea', 'data_WIND', 'data_MPPT', 'data_NOISE', 'data_MHZ19', 'data_S88'];
+            $tables = ['data_NPM', 'data_NPM_5channels', 'data_BME280', 'data_envea', 'data_WIND', 'data_MPPT', 'data_NOISE', 'data_MHZ19', 'data_S88', 'data_CCS811'];

            $tableStats = [];
            foreach ($tables as $tableName) {
@@ -844,7 +844,7 @@ if ($type == "download_full_table") {
    $table = $_GET['table'] ?? '';

    // Whitelist of allowed tables
-    $allowedTables = ['data_NPM', 'data_NPM_5channels', 'data_BME280', 'data_envea', 'data_WIND', 'data_MPPT', 'data_NOISE', 'data_MHZ19', 'data_S88'];
+    $allowedTables = ['data_NPM', 'data_NPM_5channels', 'data_BME280', 'data_envea', 'data_WIND', 'data_MPPT', 'data_NOISE', 'data_MHZ19', 'data_S88', 'data_CCS811'];

    if (!in_array($table, $allowedTables)) {
        header('Content-Type: application/json');
@@ -862,7 +862,8 @@ if ($type == "download_full_table") {
        'data_MPPT' => 'TimestampUTC,Battery_voltage,Battery_current,Solar_voltage,Solar_power,Charger_status',
        'data_NOISE' => 'TimestampUTC,Current_LEQ,DB_A_value',
        'data_MHZ19' => 'TimestampUTC,CO2_ppm',
-        'data_S88' => 'TimestampUTC,CO2_ppm'
+        'data_S88' => 'TimestampUTC,CO2_ppm',
+        'data_CCS811' => 'TimestampUTC,eCO2_ppm,TVOC_ppb'
    ];

    try {
@@ -1016,6 +1017,12 @@ if ($type == "s88") {
    echo $output;
 }

+if ($type == "ccs811") {
+    $command = 'sudo /usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/get_data.py';
+    $output = shell_exec($command);
+    echo $output;
+}
+

 if ($type == "table_mesure") {
    $table=$_GET['table'];
@@ -1674,6 +1681,10 @@ if ($type == "get_systemd_services") {
                'description' => 'Reads CO2 concentration from MH-Z19 sensor',
                'frequency' => 'Every 2 minutes'
            ],
+            'nebuleair-ccs811-data.timer' => [
+                'description' => 'Reads eCO2/TVOC from CCS811 air-quality sensor',
+                'frequency' => 'Every 10 seconds'
+            ],
            'nebuleair-s88-data.timer' => [
                'description' => 'Reads CO2 concentration from Senseair S88 sensor',
                'frequency' => 'Every 10 seconds'
@@ -1765,6 +1776,7 @@ if ($type == "restart_systemd_service") {
        'nebuleair-noise-data.timer',
        'nebuleair-mhz19-data.timer',
        'nebuleair-s88-data.timer',
+        'nebuleair-ccs811-data.timer',
        'nebuleair-db-cleanup-data.timer',
        'nebuleair-wifi-powersave.timer',
        'nebuleair-cpu-power.service',
@@ -1831,6 +1843,7 @@ if ($type == "toggle_systemd_service") {
        'nebuleair-noise-data.timer',
        'nebuleair-mhz19-data.timer',
        'nebuleair-s88-data.timer',
+        'nebuleair-ccs811-data.timer',
        'nebuleair-db-cleanup-data.timer',
        'nebuleair-wifi-powersave.timer',
        'nebuleair-cpu-power.service',
--- a/html/sensors.html
+++ b/html/sensors.html
@@ -409,6 +409,62 @@
      });
    }

+    function getCCS811_values() {
+      console.log("Data from CCS811 air-quality sensor:");
+      $("#loading_ccs811").show();
+
+      $.ajax({
+        url: 'launcher.php?type=ccs811',
+        dataType: 'json',
+        method: 'GET',
+        success: function (response) {
+          console.log(response);
+          const tableBody = document.getElementById("data-table-body_ccs811");
+          tableBody.innerHTML = "";
+          $("#loading_ccs811").hide();
+
+          if (response.error) {
+            $("#data-table-body_ccs811").append(`
+                                <tr>
+                                    <td colspan="2" class="text-danger">
+                                        ⚠ ${response.error}
+                                    </td>
+                                </tr>
+                            `);
+          } else {
+            if (response.TVOC !== undefined) {
+              $("#data-table-body_ccs811").append(`
+                                <tr>
+                                    <td>TVOC</td>
+                                    <td>${response.TVOC} ppb</td>
+                                </tr>
+                            `);
+            }
+            if (response.eCO2 !== undefined) {
+              $("#data-table-body_ccs811").append(`
+                                <tr>
+                                    <td>eCO2</td>
+                                    <td>${response.eCO2} ppm</td>
+                                </tr>
+                            `);
+            }
+          }
+        },
+        error: function (xhr, status, error) {
+          console.error('AJAX request failed:', status, error);
+          $("#loading_ccs811").hide();
+          const tableBody = document.getElementById("data-table-body_ccs811");
+          tableBody.innerHTML = `
+                            <tr>
+                                <td colspan="2" class="text-danger">
+                                    ⚠ Erreur de communication avec le capteur
+                                </td>
+                            </tr>
+                        `;
+        }
+      });
+    }
+
    function getMHZ19_values() {
      console.log("Data from MH-Z19 CO2 sensor:");
      $("#loading_mhz19").show();
@@ -675,6 +731,29 @@
          container.innerHTML += S88_HTML;
        }

+        //creates CCS811 air-quality (eCO2/TVOC) card
+        if (config.CCS811) {
+          const CCS811_HTML = `
+      <div class="col-sm-3">
+        <div class="card">
+          <div class="card-header">
+            I2C
+          </div>
+          <div class="card-body">
+            <h5 class="card-title">CCS811 (TVOC / eCO2)</h5>
+            <p class="card-text">Capteur de composés organiques volatils.</p>
+            <button class="btn btn-primary mb-1" onclick="getCCS811_values()" data-i18n="common.getData">Get Data</button>
+            <div id="loading_ccs811" class="spinner-border spinner-border-sm" style="display: none;" role="status"></div>
+            <table class="table table-striped-columns">
+              <tbody id="data-table-body_ccs811"></tbody>
+            </table>
+          </div>
+        </div>
+      </div>`;
+
+          container.innerHTML += CCS811_HTML;
+        }
+
        //Si on a des SONDES ENVEA connectée il faut faire un deuxième call dans la table envea_sondes_table
        //creates ENVEA debug card
        if (config.envea) {
--- a/installation_part1.sh
+++ b/installation_part1.sh
@@ -27,7 +27,7 @@ sudo apt update && sudo apt install -y git gh apache2 sqlite3 php php-sqlite3 py

 # Install Python libraries
 info "Installing Python libraries..."
-sudo pip3 install pyserial requests adafruit-circuitpython-bme280 crcmod psutil gpiozero ntplib adafruit-circuitpython-ads1x15 nsrt-mk3-dev pytz --break-system-packages || error "Failed to install Python libraries."
+sudo pip3 install pyserial requests adafruit-circuitpython-bme280 adafruit-circuitpython-ccs811 crcmod psutil gpiozero ntplib adafruit-circuitpython-ads1x15 nsrt-mk3-dev pytz --break-system-packages || error "Failed to install Python libraries."

 # Install Tailscale (for remote SSH access via Headscale tailnet)
 info "Installing Tailscale..."
--- a/services/setup_services.sh
+++ b/services/setup_services.sh
@@ -269,6 +269,38 @@ AccuracySec=1s
 WantedBy=timers.target
 EOL

+# Create service and timer files for CCS811 air-quality (eCO2/TVOC) Data
+cat > /etc/systemd/system/nebuleair-ccs811-data.service << 'EOL'
+[Unit]
+Description=NebuleAir CCS811 Air-Quality (eCO2/TVOC) Data Collection Service
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/write_data.py
+User=root
+WorkingDirectory=/var/www/nebuleair_pro_4g
+StandardOutput=append:/var/www/nebuleair_pro_4g/logs/ccs811_service.log
+StandardError=append:/var/www/nebuleair_pro_4g/logs/ccs811_service_errors.log
+
+[Install]
+WantedBy=multi-user.target
+EOL
+
+cat > /etc/systemd/system/nebuleair-ccs811-data.timer << 'EOL'
+[Unit]
+Description=Run NebuleAir CCS811 Air-Quality Data Collection every 10 seconds
+Requires=nebuleair-ccs811-data.service
+
+[Timer]
+OnBootSec=10s
+OnUnitActiveSec=10s
+AccuracySec=1s
+
+[Install]
+WantedBy=timers.target
+EOL
+
 # Create service and timer files for Database Cleanup
 cat > /etc/systemd/system/nebuleair-db-cleanup-data.service << 'EOL'
 [Unit]
@@ -402,7 +434,7 @@ systemctl daemon-reload

 # Enable and start all timers
 echo "Enabling and starting all services..."
-for service in npm envea sara bme280 mppt mhz19 s88 db-cleanup noise; do
+for service in npm envea sara bme280 mppt mhz19 s88 ccs811 db-cleanup noise; do
    systemctl enable nebuleair-$service-data.timer
    systemctl start nebuleair-$service-data.timer
    echo "Started nebuleair-$service-data timer"
--- a/sqlite/create_db.py
+++ b/sqlite/create_db.py
@@ -168,6 +168,15 @@ CREATE TABLE IF NOT EXISTS data_S88 (
 )
 """)

+# Create a table CCS811 (AMS CCS811 air-quality sensor: eCO2 + TVOC)
+cursor.execute("""
+CREATE TABLE IF NOT EXISTS data_CCS811 (
+    timestamp TEXT,
+    eCO2 INTEGER,
+    TVOC INTEGER
+)
+""")
+
 # Commit and close the connection
 conn.commit()
 conn.close()
--- a/sqlite/set_config.py
+++ b/sqlite/set_config.py
@@ -53,6 +53,8 @@ config_entries = [
    ("MHZ19", "0", "bool"),
    ("S88", "0", "bool"),
    ("S88_port", "/dev/ttyAMA5", "str"),
+    ("CCS811", "0", "bool"),
+    ("CCS811_address", "0x5A", "str"),
    ("modem_version", "XXX", "str"),
    ("device_type", "nebuleair_pro", "str"),
    ("language", "fr", "str"),
@@ -1 +1 @@
 .9.19
 .10.0