Different areas absorb and drain water in unique ways. Some soils, rich in clay, tend to hold water and are prone to flooding, while sandy soils drain quickly and may dry out too fast. Soil monitoring provides valuable insights by identifying areas that need attention and helping us better understand the specific characteristics of each location.
The Value of Soil Monitoring
Here’s a structured view of the value of monitoring soil moisture and temperature at different scales:
Inside the Home (Houseplants, Indoor Gardens, Greenhouses)
- Plant Health: Indoor plants are vulnerable to both under- and over-watering. Monitoring ensures the right balance, reducing stress and preventing root rot or drought stress.
- Energy Efficiency: In greenhouses or grow tents, soil temperature and moisture readings can guide heating, humidification, or ventilation, making systems more efficient.
- Convenience: Automated alerts or smart-home integrations reduce the guesswork of watering schedules, especially useful for people who travel or forget to water plants.
Outside the Home (Lawns, Gardens, Yards)
- Water Conservation: Real-time soil moisture data prevents overwatering, cutting down water waste and lowering utility bills.
- Improved Growth: Plants, lawns, and vegetable gardens thrive when watering is timed to actual soil conditions rather than fixed schedules.
- Climate Adaptation: Outdoor soil warms and dries at different rates across seasons; monitoring helps adapt to heatwaves, droughts, or cold snaps.
Community Scale (Local Community Garden Clubs, Neighborhood Parks, Shared Gardens, Urban Green Spaces)
- Public Resource Efficiency: Communities save money by reducing unnecessary irrigation of parks, shared spaces, and community gardens.
- Shared Resilience: In drought-prone areas, monitoring across multiple sites supports coordinated water-use restrictions or smart irrigation strategies.
Organizations that Care for Flowers and Plants (Florists, Nurseries, Botanical Gardens, Landscapers)
- Commercial Value: Nurseries and florists protect inventory by monitoring and maintaining optimal growth conditions, directly reducing losses.
- Service Quality: Landscapers and groundskeepers can show clients data-driven care, improving customer trust and satisfaction.
- Sustainability: Many organizations pursue certifications or sustainability goals; monitoring soil metrics provides evidence of responsible water and energy management.
A Simple Solution: Soil Clusters
Combining inexpensive soil monitoring sensors with commercial off the shelf Zigbee smart home networking can form the core of an expandable system capable of integrating larger communities. These communities may be located within a subdivision or scattered around the countryside.
The nucleus of the soil cluster is a home or building with a Samsung SmartThings device hub with Zigbee soil monitors. The soil monitors sense soil moisture and temperature and send those readings to the device hub. Readings are available on an iPhone or Android. Adding the “RainMan” service to a Windows PC allows those readings to be logged for viewing and further analysis using Excel and ChatGPT. The "AquaGraph" viewer allows easy charting of values along with saving and restoring plots.
Zigbee Soil Sensors Tested
- THIRDREALITY Smart Soil Moisture Sensor – Amazon, $20
- Spruce Sensor
Expanding Zigbee Wireless Coverage
Multiple, daisy-chained Zigbee repeaters can extend the range well into your yard or garden, and the network will automatically manage routing. Here’s how it works:
Zigbee is a mesh protocol, meaning every powered repeater (like a smart plug, light bulb, or dedicated repeater) can pass along messages. End devices (like the soil sensors) don’t need to talk directly to the hub; they can “hop” through repeaters.
Practical Guidelines
Place repeaters between the hub and the yard sensors so there are no dead zones. Zigbee repeaters generally cover 30–60 feet indoors and more outdoors (line of sight).
Samsung Smart Home Hub
The Samsung SmartThings Hub by Aeotec connects and controls smart devices from one place. Supporting Zigbee, Wi-Fi, and Matter, it unifies lights, locks, sensors, and appliances into a single, easy-to-manage system. SmartThings is a mature, well-supported smart home ecosystem.
Tying the Community Together
Enabling the “RainMan” blockchain service allows local readings to be uploaded to the cloud and made accessible to other community or organization members for viewing and analysis. The data is stored in simple Excel spreadsheet format and can be easily downloaded and imported into ChatGPT for graphing and further analysis. The data consists only of soil readings and does not contain personal information other than a location identifier, such as lot number.
Scenario 1: Home Owner Association Has Responsibility for Irrigation
In this community, the Homeowner Association (HOA) encourages its members to install Zigbee soil moisture and temperature monitors in their yards and in adjacent shared green spaces. As the sensors become diffused through the community, a “moist picture” of the community starts to unfold. The most important benefit is simply seeing the data: residents and HOA managers can track soil conditions daily. This monitoring helps identify which areas are too dry, which are consistently overwatered, and where landscaping may need attention. It provides value, saving money on water bills, preventing plant stress, and giving the HOA transparency when residents ask why irrigation is scheduled a certain way.
Monitoring creates a foundation of knowledge, and opens the potential for automation.
Scenario 2: A Volunteer Group Takes Care of Town Foliage
In this town, a volunteer gardening group deploys Zigbee soil monitors around homes and public gardens, forming a mesh network that shares readings with the community. The immediate value is awareness: volunteers no longer rely on guesswork. They can check soil conditions before hauling watering cans or hoses, coordinate their efforts more efficiently, and catch problems like prolonged dryness or sensor anomalies before plants suffer.
Automation might come later—perhaps the town installs smart irrigation controls in flowerbeds or tree belts—but even without it, the monitoring empowers volunteers. They know when water is truly needed, can plan their schedules better, and can use the data to rally local businesses or donors around sustainability goals.
Here, monitoring itself is the game-changer, with automation seen as a potential add-on in the future.
Thanks, Dave