Vegetronix - Model THERM200 -Soil Temperature Sensor Probes

The germination temperature of plants is critical. The ideal temperature for germination of most plants is 21°C (70°F). Without monitoring your temperature, it`s easy for your seeds to get either too hot or too cold preventing your seeds from germinating.

The THERM200 is also useful when knowing when to not water plants. If its cold outside you often don`t want to water your plants, especially if you are using a sprayer, even if the soil is getting dried out. Figure 1 below shows damaged bean plants that were sprayed during a cold spell. Had their watering been delayed, they would have survived. The THERM200 together with a VH400 soil moisture sensor, allow you to perfectly control your watering of plants. The VH400 tells you if the soil is too dry and the THERM200 tells you if it is warm enough to water. You can create complex watering schemes based off your sensor data using a VegeHub Wifi Sensor Hub, and VegeCloud.com

The THERM200 helps you to protect your plants, and quickly diagnose garden problems. When used with our VegeHub WiFi Sensor Hub, you can get text message and email alerts, letting you know when your plants are in trouble from temperature extremes.

Highly Accurate With Digital Precision

The internal digital temperature sensor is highly accurate with 0.125°C of resolution. You can use the sensor over large temperature range from -40°C to 85°C.

Output is 100% Linear

This is NOT an thermistor based sensor. Thermistor based temperature sensors are non-linear, inaccurate, and a nightmare to calibrate. There is no need to implement complex inverse Steinhart-Hart equations or do complex calculations such as logarithms, which are difficult to compute for microcontrollers and humans alike.

The THERM200 is 100% linear over it`s operational range, and you or your controller can compute the temperature from the output voltage with simple math. You can convert to temperature with a single multiply and addition. Once you`ve tried the THERM200, you`ll never want to use a thermistor based sensor again.

No Calibration Needed

Because the THERM200 is a digital sensor, you will never need to calibrate it.

Waterproof and Rugged

Made of durable ABS plastic, and fiberglass, our THERM200 temperature sensor is absolutely water proof and rugged, ready for the most challenging application that you can throw at it. It can be buried at any depth in the ground, or be inserted above ground, or into the soil of your potted plants.

Interface Our Sensors to any System

The THERM200 will easily interface to any decent data logger, or microcontroller. Customers have connected it to Arduino boards, electron particle IO boards, and a slew of common microcontrollers. The output ranges from 0 to 3V so any system that can read a voltage can interface to it. 0V represents -40 °C and 3V represents 85 °C. For evaluation use a common volt meter to read its output, and determine the temperature.

Thin Blades Prevent Root Damage

Imagine your doctor giving you a shot with a syringe used for elephants. Ouch! Your plants are no different, and they will thank you for not using giant probes to take soil temperature measurements.

We designed the blade of the sensor to be as slender as possible. It can be inserted into soil and pots with minimal disturbance to the vital root systems of your plants.

Vegetronix Modular Building Blocks

We provide modular building blocks that you need to create your garden application. With these building blocks, you can create systems that will monitor temperature, and automatically control heaters and fans.

For recording data, we carry simple low-cost data loggers, which can read up to 8 sensors. Waterproof wall mountable displays allow you to see your sensor data, near its source.

For remote viewing of data, we provide a WiFi Data Logger, which will read up to 4 sensors, and store data in the cloud. This Sensor Hub lets you remotely view your sensor data on your phone`s web browser. You can even receive text messages, and email alerts.

We`ve partnered with the sensor cloud site - VegeCloud.com which will graph, store, and manage your water level sensor data.

Bonus Features

The THERM200 is very low power. It draws only 3mA when activated. For low power battery applications, the THERM200 can be powered briefly before reading, and then shut down, to conserve battery power.

The temperature sensor can be used with our soil moisture sensors, and together they can be used to detect the presence of ice.

Our sensors come in standard cable lengths of 2 meters, 5 meters and 10 meters. See the ordering table below.

We Want you to be Happy

Ordering is easy and low risk. Since we build our own products at our factory, all of our products are in stock. When you place your order from our website, it will ship same day from our factory, and you`ll have it in your hands in just a couple of days. We ship to nearly EVERY COUNTRY in the world.

• Measure air or soil temperature.
• Monitor germination temperature of seeds.
• Monitor greenhouse temperature.
• Get text messages and phone alerts from your plants.
• Protect plants from frost.
• Ice detection systems.
• Irrigation and sprinkler systems.