• Sensor
Apollo Automation

PLT-1 Ultimate Plant Sensor

$27.99
$27.99
Shipping calculated at checkout.

The PLT-1B does not include a battery or charger due to shipping constraints. Users will need to source their own rechargeable 18650 for the battery version and a charger. Battery life is estimated at 6 months based on a quality rechargeable 18650 and the default sleep / wake settings.

The PLT-1 is an indoor plant multisensor that measures soil moisture, air temperature, humidity, LUX, and UV. It also features an onboard piezo buzzer and addressable RGB LED. Soil temperature can be measured using the optional temperature probe add-on. The sensor comes in a battery (B) and non-battery version, with the non-battery version being significantly smaller.

The PLT-1 uses a capacitive soil moisture sensor, which offers much better accuracy and durability compared to resistive sensors. Additionally, the ground contact portion is protected with a conformal coating, ensuring longevity and resistance to environmental factors.

Good sources for batteries:

USA: https://imrbatteries.com/products/samsung-35e-18650-3500mah-8a-battery
EU: https://www.nkon.nl/

Version:
  • Automated Watering: With its capacitive soil moisture sensor, you can set up automations to water plants only when moisture levels drop below a certain threshold.
  • Optimizing Sunlight Exposure: Use the LUX and UV sensors to monitor light levels, ensuring your plants get the right amount of sunlight. Automate window shades or grow lights based on current light conditions.
  • Temperature & Humidity Management: Track air temperature and humidity with the AHT20-F sensor, adjusting indoor climate controls (like fans, heaters, or humidifiers) to maintain ideal growing conditions.
  • Soil Temperature Monitoring: Use the optional waterproof soil temperature probe to monitor and control soil warmth for temperature-sensitive plants, especially in colder months.
  • Visual & Audio Alerts: The RGB LED can be programmed for visual notifications, such as turning red when soil is dry or green when conditions are optimal. The piezo buzzer can alert you if immediate action is needed.
  • Assembled sensor with case
  • Apollo sticker

We hope to build a community on our Discord and continue delivering products the community wants. Our team will be there to help answer any questions, suggestions, or problems you might have.

Join our Discord.

Please see our Apollo Wiki for more information.

Product Details

  • Capacitive Soil Moisture Sensor with conformal coating: Accurate and durable, perfect for monitoring plant hydration.
  • AHT20-F Air Temperature & Humidity Sensor: Dust-protected for reliable air condition tracking.
  • LTR390 UV & LUX Sensor: Measures light and UV exposure, ensuring optimal lighting for plants.
  • Optional DS18B20 Waterproof Soil Temperature Probe: Monitors soil temperature with precision (20 cm / 7.8 inches).
  • RGB LED: Customizable for notifications (e.g., watering alerts, light levels).
  • Piezo Buzzer: Provides audible alerts for important plant care events.
  • Battery and Non-Battery Versions: Flexible power options to suit different setups and needs.
  • Home Assistant Integration: Easily automate and monitor plant health through your smart home system.
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Customer Reviews

Based on 17 reviews
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Phil
PLT-1 Battery powered

I purchased 2 of the PLT-1 battery powered sensors for indoor use in 2 of my house plants. So far, I am really enjoying getting to know them. Home Assistant integration was a snap. I have Eero Wi-Fi, and the initial configuration showed all the mesh routers. At first, I was a little confused as to what to pick, but if you look at the awesome documentation provided by Apollo you'll see in the Wiki setup that you should manually enter your Wi-Fi SSID and Password. I'm using one of the recommended batteries from Discord and have been playing around with the sleep timeout. If you leave sleep off the battery will drain in about 2 days, luckily you can easily configure wake timer, etc. from Home Assistant. I really like all the sensors included on the device. It's already caught 1 plant that was completely out of water. The battery version of the sensor is bigger than the powered one, but the green 3d printed case blends right into the plants. Apollo has delivered another solid device. I'd highly recommend picking one of these up. Shipping was fast as well as great packaging.

S
Scott R.
Add-on-itus is a real thing!

Six months ago, I picked up an Apollo Automations PLT-1 to help keep the one lonely plant in my office alive—and it worked like a charm! With seamless integration into Home Assistant, I was able to set up automations that kept the soil moisture at ideal levels. The setup was smooth, and the sensor’s accuracy impressed me right away.

Fast forward to today, and I now have 11 of these sensors deployed—2 PLT-1s and 9 of the PLT-1B models—across a growing indoor jungle of happy, thriving plants. The PLT-1B sensors have been incredibly reliable, easy to maintain, and a joy to integrate into my smart home setup.

These devices have completely changed how I care for my plants. No more guessing or overwatering. I highly recommend them to anyone using Home Assistant who wants healthy plants without the hassle.

🌿 Five stars all the way!

M
Maik L.
A very beautiful product and very well made!

Unfortunately, importing it into Germany was very complicated and took several weeks, but that wasn't the sender's fault, it was the fault of the German authorities.

S
S.
PLT-1B

It was super easy to place the order. It was very clear what additional items needed to be purchased in order to make this a turnkey solution.It arrived at my door quickly and setup was a breeze. This was my first time using ESP-32 devices and it couldn’t more easy to adopt once home assistant was setup.

T
Tomer H.
Amazing product :)

Very easy setup, Instantly linked with HA. The camouflage green makes it practically invisible. The sensors seems very accurate.

Overall very satisfied, and I'll definitely order more in the future!

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