CO₂ Sensor
The oracle of your grow room. Swiss Sensirion dual-beam NDIR for CO₂, separate Sensirion sensors for temperature and humidity, plus ambient light detection.
One device tells you everything that matters — CO₂ levels, temperature, humidity, VPD, light status, and light pollution. Deploy it and know your environment completely.
Encrypted SMS and telephone voice alerts when parameters exceed your thresholds.
Everything You Need to Know
Most sensors measure one thing. This one measures everything that matters — and calculates the derived values you actually need.
Dual-Beam NDIR Technology
We use a Swiss Sensirion dual-beam NDIR (Non-Dispersive Infrared) CO₂ sensor. This isn't the cheap single-beam sensor found in consumer devices. Dual-beam means automatic self-correction and dramatically reduced drift over time.
NDIR sensors measure CO₂ by shining infrared light through a sample chamber. CO₂ molecules absorb specific wavelengths. Single-beam sensors drift as the IR source degrades. Dual-beam sensors use a reference channel to compensate — typical drift is just 50 ppm to 80 ppm maximum per year.
The CO₂ sensor includes temperature and humidity sensing on the same chip, but we use separate dedicated Sensirion sensors for those measurements — better accuracy than relying on the CO₂ sensor's built-in readings.
Why NDIR Matters
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Accuracy
±30 ppm typical accuracy — precise enough to optimize photosynthesis and detect CO₂ supplementation effectiveness
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Stability
Dual-beam self-correction minimizes drift — typical 50 ppm to 80 ppm maximum per year
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Range
0-10,000 ppm measurement range — covers everything from ambient (~420 ppm) to supplemented grows (1,500+ ppm)
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Field calibration
Place in fresh air (~420 ppm) and trigger calibration from the app — no reference gases required
Sensor Specifications
±30 ppm accuracy, 0-10,000 ppm range, 50-80 ppm/year max drift
Dedicated sensor — not relying on CO₂ sensor's built-in. ±0.2°C typical accuracy.
Dedicated sensor — ±2% RH typical accuracy, full 0-100% range
High-dynamic-range for light status detection and pollution monitoring
Separate Sensors, Better Accuracy
Many CO₂ sensors include built-in temperature and humidity readings — but they're often compromised by heat from the NDIR measurement process itself. We use separate dedicated Sensirion sensors for temperature and humidity, physically isolated from the CO₂ measurement chamber.
The result is accurate environmental data you can actually trust — not readings skewed by self-heating or measurement artifacts.
The device automatically calculates VPD (Vapor Pressure Deficit) from the temperature and humidity readings — the metric that actually matters for plant transpiration. No manual calculations, no lookup charts. Just the number you need.
Light Awareness
The integrated lux meter isn't for measuring PAR — it's for knowing what's happening in your room when you're not there.
Dark Cycle Protection
Light pollution during dark periods causes stress, hermaphroditism, and yield loss. The lux sensor gives you proof that dark means dark.
System-Wide Dark Mode
Light data is shared across your OMGROW system. When darkness is detected, all devices automatically dim their indicator lights — protecting your dark cycle from the equipment itself.
Hardware & Connectivity
The Device
- • Compact enclosure with proper sensor placement — CO₂ sensor isolated from heat-generating components
- • WiFi connectivity — connects directly to your network, or to our optional gateway for areas with limited coverage
- • Standard 5V USB power — any phone charger works as a replacement
- • Over-the-air firmware updates — new features pushed automatically when connected
- • Dark room aware — indicator lights automatically dim when sensors detect lights-off, protecting your dark cycle
Access From Anywhere
- • TLS-encrypted connection to our servers — monitor from any phone, tablet, or computer, anywhere in the world
- • SMS and phone call alerts — set thresholds for CO₂, temperature, humidity, or VPD and get notified immediately if breached
- • Historical graphs included — 48 hours of real-time data and 7 days of aggregated data, free, no subscription
- • Web app works on any browser. Native Android and iOS apps available.
- • No subscriptions. No monthly fees. One purchase, lifetime access.
Printed in PLA Bioplastic
The housing is 3D printed in Bambu Lab PLA Pure — a five-ingredient bioplastic made from plant starch, with no plasticiser of any kind. No phthalates, and none of the polyethylene glycol or citrate esters that some PLA compounds use. Independent SGS testing of printed samples under EU Regulation 10/2011 measured overall migration in all four food simulants and found none detectable in any of them, including 3% acetic acid held at 70°C.
Those reports cover the material we print in rather than certifying this finished part, and we don't market our enclosures as food-safe — printed parts have layer lines, which is a hygiene question no chemistry can answer.
Why we build from bioplasticReady to know your grow room completely?
All configurations available with 2 week lead time. Shipping worldwide.