Apollo Automation - Apollo PLT-1B plant sensor for Home Assistant (battery version)

Overview

The Apollo PLT-1B Ultimate Plant Sensor is an advanced tool designed for home automation and gardening enthusiasts. It enables detailed monitoring of the environmental conditions of indoor plants.

Thanks to its capacitive probe protected by a conformal coating, the PLT-1B guarantees high accuracy and enhanced durability compared with conventional sensors. Combined with Home Assistant via ESPHome, it enables you to trigger automatic watering, light management and temperature control.

Key functions

• Soil moisture measurement with high-precision capacitive sensor
• Temperature and humidity monitoring
• Ambient light (LUX) and UV detection
• Optional ground temperature monitoring with waterproof probe
• Visual alerts via configurable RGB LEDs (water levels, light, etc.)
• Audible alarms with piezoelectric buzzer
• Automation options (watering, light control, climate, etc.)
• Full Home Assistant integration via ESPHome
• Available in two different versions: USB-C power supply or battery (18650) with up to 6 months' autonomy.
• Ground temperature sensor (optional) for greater precision.

Technical specifications

• Integrated sensors
  • Ground humidity: capacitive sensor with conformal coating.
  • Air temperature and humidity: dust-proof AHT20-F sensor.
  • Brightness and UV: LTR390 sensor.
  • Ground temperature (optional): waterproof DS18B20 sensor (20 cm).
• Versions: with 18650 battery (not included)
• Autonomy: up to 6 months with default settings
• Power supply: rechargeable 18650 battery(not included) or external power supply
• Connectivity: Wi-Fi, ESPHome, Home Assistant.
• Alerts and signalling: addressable RGB LED and audible buzzer.
• Dimensions
  • Without battery: 41 × 26 × 14 mm (77 mm probe).
  • With battery: slightly larger.
• Indoor use only (not waterproof).