The three pillars of successful mushroom farming are CO₂, humidity and temperature. Get them right and yields are consistent, quality is high, and crops complete on schedule. Get them wrong and you lose entire batches. Manual management is error-prone and labour-intensive — automated climate control is now standard for profitable commercial mushroom farming in India.
CO₂ Control in Mushroom Farms
Carbon dioxide is produced by mushroom mycelium during respiration. In a closed grow room, CO₂ accumulates rapidly — especially at night when ventilation is reduced. High CO₂ is the #1 cause of poor-quality mushrooms.
CO₂ Effects on Mushroom Quality
| CO₂ Level | Effect on Mushrooms |
|---|---|
| <800 ppm | Ideal — thick caps, short stems, high market price |
| 800–1500 ppm | Acceptable — slight cap thinning |
| 1500–3000 ppm | Long stems, small caps — 30% price reduction |
| >3000 ppm | Crop stress, pinning failure, potential crop loss |
How Contol-X CO₂ Controller Works
The SCD30 CO₂ sensor reads ambient CO₂ every 5 seconds with ±30 ppm accuracy. When CO₂ exceeds the setpoint (e.g. 800 ppm for button mushrooms), the controller opens relay D1 (ventilation fan) for a configurable duration. The cycle repeats until CO₂ drops below setpoint. This maintains CO₂ within a ±50 ppm band around the target — impossible to achieve manually.
Humidity Control in Mushroom Grow Rooms
Mushrooms are 90% water by weight. They need ambient humidity above 85% to grow properly. A humidity drop below 75% for even 2–3 hours during fruiting can cause caps to crack, pins to abort, and weight loss of 15–25%.
Humidity Setpoints by Species
| Species | Spawn Run | Pinning | Fruiting |
|---|---|---|---|
| Button | 85–90% | 90–95% | 88–92% |
| Oyster | 85–90% | 88–92% | 85–95% |
| Milky | 80–85% | 85–90% | 80–90% |
| Shiitake | 80–85% | 85–90% | 85–90% |
Contol-X Humidity Control Logic
The SHT-series humidity sensor reads RH every 10 seconds. When RH drops below setpoint, Contol-X activates the humidifier relay. Misting duration is configurable (pulse width modulation) to avoid over-humidification. Upper RH limit (e.g. 96%) triggers ventilation to prevent condensation and contamination.
Temperature Control in Mushroom Grow Rooms
Temperature requirements vary significantly by species and stage. The most critical transition is pinning induction in button mushrooms — requiring a precise temperature drop from 24°C to 16°C over 12–18 hours. No manual system can reliably achieve this.
5-Sensor Temperature Monitoring in Contol-X
Contol-X reads 5 temperature points simultaneously:
- NTC1 — Air temperature, grow room centre
- NTC2 — Compost/substrate surface temperature
- NTC3 — Air temperature near HMI panel
- PT100 — Compost core temperature (high-accuracy)
- PT100-2 — Secondary position (door area, hot/cold spot)
Multiple temperature points reveal hot/cold spots, allow compost internal temperature monitoring (critical for Phase 2), and detect equipment failures early.
The SCD30 Sensor — Why It Matters
SCD30 CO₂ Sensor Specifications
- Measurement range: 400–10,000 ppm CO₂
- Accuracy: ±30 ppm + 3% of reading
- Also measures temperature (±0.4°C) and humidity (±3% RH)
- Self-calibration (ASC) — no manual calibration needed
- NDIR optical sensing — no chemical consumption, 10+ year life
Most cheap mushroom controllers use MH-Z19B sensors (±100 ppm accuracy). Contol-X uses SCD30 for 3× better accuracy — the difference between a ₹15/kg mushroom and a ₹22/kg mushroom.
Relay Control Logic — How Equipment Is Triggered
| Relay | Equipment | Trigger Condition |
|---|---|---|
| D0 | Heater | Temperature < lower setpoint AND door closed |
| D1 | Cooler / AC | Temperature > upper setpoint |
| D2 | Humidifier | RH < lower setpoint (pulse width control) |
| D3 | Ventilation fan | CO₂ > setpoint OR RH > upper limit |
Frequently Asked Questions
What is the ideal CO₂ level for mushroom grow rooms?+
How does an automatic humidity controller work in mushroom farms?+
What temperature sensors are used in mushroom grow room controllers?+
How many relay outputs does a mushroom controller need?+
Can I set different CO₂ and humidity setpoints for each growth stage?+
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