You want a soil moisture sensor to help you decide whether plants need water. Its position is one of the first decisions to get right: are you measuring where the relevant roots take up water, or somewhere with different conditions? A useful reading needs a location and depth that match the question you are asking.
This guide assesses the Milesight EM500-SMTC and the information needed for a clear procurement decision. Start with the measurement task, then establish how the received readings will be used.
Choose a soil moisture sensor around the measurement task
Describe the question you want to answer: a trend at one location, differences between areas or a change after planned watering. That determines which positions are useful and which conditions need to be recorded.
Separate the measurement from the decision. The sensor provides values; the appropriate response depends on the crop, soil, site and operating practice. Do not adopt an arbitrary general percentage as an automatic irrigation threshold.
Give each proposed point an identifiable name, depth and associated area. Record who interprets its values and what observations on site will provide context. This turns a list of devices into a measurement plan another person can understand.
Begin with points that answer a specific question. Additional devices become useful when their expected contribution is clear. A later expansion is easier to justify when the first observations and their limitations have been documented.
Assess the EM500-SMTC LoRaWAN soil moisture sensor
The Milesight EM500-SMTC is listed in the Kilo Electronics catalogue. The manufacturer’s product introduction identifies soil moisture, temperature and electrical conductivity measurements with LoRaWAN transmission.
Decide which readings the project needs and how the application will present them. Soil moisture and air humidity are different measurement tasks. An electrical-conductivity value should also retain that meaning; further interpretation needs its own technical context.
Check the exact version, radio region and documentation associated with the offer. Similarly named EM500 models do not necessarily measure the same quantities. Keep the model consistent across the order, site record and application identity.
Confirm the package contents explicitly, including the probe, transmitter and required mounting accessories for that version. A product-family image does not establish what every offer includes or whether an item is currently available.
Plan a soil moisture sensor position you can explain later
The position is part of interpreting the result. In the EM500-SMTC manual, Milesight discusses representative locations and notes that air gaps or altered compaction around the probe can affect readings. Use the installation instructions for the actual supplied version.
Record the position so it remains identifiable after the site changes or another person takes over. A photograph and a short description can help. Note relevant changes to watering or use alongside the measurements.
Assess the probe and radio unit as one installation. The desired observation point and a suitable transmitter location can have different requirements. Check the cable arrangement, mounting and environmental conditions for the proposed setup.
Do not move the measurement point silently within a comparison period. Mark the change and consider whether observations before and after relocation answer the same question. A clearly annotated history is more useful than a long graph with unexplained changes.
Verify the LoRaWAN soil moisture sensor through to the application
Plan the complete path: sensor, suitable LoRaWAN network, network server and application. A successful network join does not establish that all measurements are interpreted and stored correctly.
For a received report, check the device identity, measurement, unit and timestamp. Compare decoded values with the data format for the supplied version. A dashboard label cannot correct a field that represents the wrong quantity.
Distinguish a current report from an old value that remains on screen. A missing report is not a confirmed zero. Agree who investigates absent or implausible data and what evidence they need.
Observe the installed system for a period relevant to the project. Record the conditions and actual results. A brief successful transmission on a desk does not validate the eventual measurement position under its normal conditions.
Buy a soil moisture sensor with an acceptance plan
Summarize the decisions in a short project record:
| Decision | Information to retain |
|---|---|
| Measurement task | Required quantities and their intended use |
| Position | Area, location and depth |
| Device | Exact model, radio region and package contents |
| Data path | Network, application and responsible person |
| Acceptance | Expected observation, test period and recorded result |
If automated watering is planned later, treat it as an additional task. The controller, decision rules and behavior when readings are missing require their own design and validation. Purchasing a sensor alone does not establish that function.
Choose the soil moisture sensor against these requirements and assess the current EM500-SMTC offer. A suitable observation point, clear identity and verified data path make the readings easier to use and maintain.
Soil moisture sensor: check one complete monitoring project
You can try Kilo free with up to five devices, one dashboard and one rule. Check the current plan against your intended setup; hardware, installation and connectivity are separate costs. Start with one measurement and verify that its data arrives as expected before expanding.
You can buy suitable project devices and accessories at Kilo Electronics. Check the exact variant and supported connection to your application before ordering.