{"id":243031,"date":"2026-06-22T15:02:15","date_gmt":"2026-06-22T13:02:15","guid":{"rendered":"https:\/\/emariete.com\/co2-gadget-guia-low-power\/"},"modified":"2026-10-29T12:33:18","modified_gmt":"2026-10-29T11:33:18","slug":"co2-gadget-guide-low-power","status":"publish","type":"post","link":"https:\/\/emariete.com\/en\/co2-gadget-guia-low-power\/","title":{"rendered":"Guide to Low-CO2 Gadgets: Deep Sleep and Battery Life"},"content":{"rendered":"

CO2 Gadget features a low-power binary system (HIGH_PERFORMANCE \/ LOW_POWER) that achieves a battery life of up to 3 months with a single 18650 battery, compared to the few hours offered by a conventional meter. Here you\u2019ll see how to configure wake-up via CO\u2082, via timer, via button, and non-blocking deep sleep techniques for SCD4x and CM1106.<\/p>\n\n\n\n\n\n\n

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Operating modes (binary, from v0.16.x)<\/h2>\n\n\n

From v0.16.015-beta onwards, CO2 Gadget uses a model binary<\/strong> modes (there used to be 4 modes, which have now been simplified). The preference lowPowerMode<\/code> Take the values:<\/p>\n\n\n

Mode<\/th>Value<\/th>Description<\/th>Consumption<\/th><\/tr><\/thead>
HIGH_PERFORMANCE<\/strong><\/td>`0`<\/td>Continuous operation, no standby mode, all radios active<\/td>High<\/td><\/tr>
LOW_POWER<\/strong><\/td>`1`<\/td>Deep sleep with configurable periodic wake-ups<\/td>Very low<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n

If you upgrade from a version earlier than v0.16, the old `MEDIUM_LOWPOWER` setting is automatically migrated to `LOW_POWER=1` via `upgradePreferences()` on the first boot.<\/p><\/blockquote>\n\n\n

Deep sleep cycle<\/h2>\n\n\n

In LOW_POWER mode, the meter wakes up periodically, takes measurements, publishes data (if applicable) and goes back to sleep. The main parameters are:<\/p>\n\n\n

Parameter<\/th>Constant<\/th>Default<\/th>Meaning<\/th><\/tr><\/thead>
`waitToDeep`<\/td>`timeToWaitForCaptivePortal`<\/td>60 s<\/td>Time spent awake before going back to sleep<\/td><\/tr>
`timeSleeping`<\/td>`DEEP_SLEEP_SECONDS_DEFAULT`<\/td>60 s<\/td>Duration of deep sleep<\/td><\/tr>
Sleep range<\/td>`DEEP_SLEEP_SECONDS_MIN\/MAX`<\/td>15\u2013900 s<\/td>Configurable minimum and maximum limits<\/td><\/tr>
`activateWiFiEvery`<\/td>`cyclsWifiConn`<\/td>5<\/td>Wake cycles between Wi-Fi connections<\/td><\/tr>
`cycRedrawDis`<\/td>\u2014<\/td>5<\/td>Intervals between screen refreshes<\/td><\/tr>
`wakeOnCO2Alert`<\/td>\u2014<\/td>`true`<\/td>The screen lights up when the orange threshold is exceeded<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n

Sensor behaviour in low-power mode (v0.16.x)<\/h2>\n\n\n

Each sensor has a handler optimised to minimise power consumption whilst in wake mode:<\/p>\n\n\n