Automate Your Fruiting Chamber
Monitor humidity, CO\u2082, temperature, and fresh air exchange — from your phone. No coding required.
The Problem with Manual Grows
Crop loss from humidity swings
Manual misting is unreliable — a 10% RH drop during pinning can abort a flush. PID automation maintains ±2% RH continuously, day and night.
No visibility when you’re away
Check live sensor readings from work, receive alerts the moment CO₂ climbs or humidity drops below threshold — without driving back to check.
Complex automation tools
No YAML, no terminal, no Python scripts. LoopString’s visual drag-and-drop flow builder lets you wire up sensors and actuators in minutes.
How LoopString Solves It
PID humidity control
On-edge PID loops run directly on your Raspberry Pi, keeping relative humidity tight to setpoint even when your internet is down.
CO₂ monitoring
MH-Z19 NDIR sensor integration with live sparklines. Watch CO₂ trends across fruiting stages and trigger FAE fans automatically.
Automated fresh air exchange
Schedule FAE fan cycles by time of day or CO₂ threshold — configurable rules, no coding required.
Alert thresholds
SMS and in-app notifications fire immediately when temperature, humidity, or CO₂ breach your configured limits.
Data logging & history
Sensor readings are logged automatically. Review trends over days or weeks to optimize your fruiting conditions and track grows.
How It Works
Flash a Pi SD card
Download our Pi image, flash it to an SD card, and boot. The first-boot wizard connects your device to your account in about 5 minutes.
Plug in your sensors
Connect a DHT22 for humidity and temperature, an MH-Z19 for CO₂, and any relay board for your humidifier and FAE fans.
Pick a template and deploy
Select the Mushroom Fruiting Chamber template, review the auto-generated flow, deploy in one click, and monitor from your phone.
Pre-Built Template
Mushroom Fruiting Chamber
A complete automation flow with PID humidity control, CO\u2082-triggered FAE fans, temperature monitoring, and configurable alert thresholds. Estimated hardware cost: ~$80.
- DHT22 or SHT31 humidity + temperature sensor
- MH-Z19 CO₂ sensor
- Relay board for humidifier and FAE fans
- PID loop pre-configured for 90–95% RH
- CO₂ threshold FAE trigger (default: 2000 ppm)
Hardware You'll Use
DHT22
Temperature & humidity sensor
GPIOMH-Z19
NDIR CO₂ sensor for fruiting chamber monitoring
UARTSHT31
High-accuracy temperature & humidity (I²C alternative)
I²CRelay HAT
Controls humidifier, FAE fans, and heater
GPIO
Join growers who've automated their fruiting chambers
Free tier supports one device and up to 8 sensor slots — enough for a complete single-chamber setup.
Ready to automate your fruiting chamber?
Start free — no credit card required.