Wi-Fi 7-in-1 Soil Sensor

A 7-in-1 soil sensor is a single probe that measures seven soil properties at once: moisture, temperature, electrical conductivity (EC), pH, nitrogen, phosphorus and potassium. It is also called a multi-parameter soil sensor or a soil NPK sensor. The MacSync Wi-Fi 7-in-1 soil sensor adds a battery-operated Wi-Fi transmitter, so the seven readings reach your server or dashboard without a separate controller or gateway. In smart agriculture it is the sensor that covers irrigation, fertigation and soil health from one hole in the ground.

A soil moisture sensor reads one thing: how much water the soil is holding. A 7-in-1 soil sensor reads moisture as well, and adds soil temperature, EC, pH and a nitrogen, phosphorus and potassium trend from the same probe. If irrigation is the only question, moisture and temperature are enough. If fertigation, salinity or soil pH matter too, the extra readings earn their place.

Soil moisture from 0 to 100% volumetric water content (±5%); soil temperature from −45 to +115 °C (±0.5 °C); EC from 0 to 10,000 µS/cm (±3% of full scale); pH from 3 to 9 (±0.3 pH); and nitrogen, phosphorus and potassium, each from 0 to 1,999 mg/kg. Moisture, temperature, EC and pH are direct measurements. The three nutrient values are estimates, best used as a trend.

Treat them as a trend, not as a laboratory result. Probes of this kind estimate nitrogen, phosphorus and potassium from the soil's electrical behaviour rather than by chemical analysis, so the absolute numbers can differ from a lab report and shift with moisture, temperature and soil type. The datasheet figure of ±2% of full scale describes the sensor's own measurement, not its agreement with a laboratory. Used properly — compared with a lab test from the same spot, then watched over time — the readings show whether nutrients are building up or running down between tests.

No. A laboratory test uses chemical extraction and remains the reference for fertiliser recommendations. A buried sensor does a different job: it gives a continuous record of moisture, temperature, EC and pH, and a nutrient trend, between one soil test and the next. Most growers who use sensors keep testing as well.

No. The MacSync Wi-Fi 7-in-1 soil sensor joins your existing 2.4 or 5 GHz Wi-Fi network directly and publishes to your MQTT broker or HTTPS endpoint. There is no gateway, hub or proprietary receiver to buy or maintain.

No. A bare 7-in-1 probe needs a controller, an RS485 interface, a power supply and code before it reports anything. This sensor includes the transmitter, the battery and the Wi-Fi, and publishes the readings itself over MQTT or HTTPS, so there is nothing to program.

Typically up to 100 m from the access point, depending on what stands in between: walls, polyhouse structures, foliage and terrain all reduce it. Check before fixing the transmitter: Send Uplink in the Maya app reports the Wi-Fi signal strength at that spot, and −65 dBm or stronger is a good link. If the plot is beyond reach, add an outdoor access point or use the LoRaWAN version of the sensor.

The sensor runs on an internal 19 Ah cell. Using the Macnman Wi-Fi battery life calculator with one probe reading and one TLS connection per upload on a DHCP network, the estimate is about 2.5 years at 15-minute uploads, about 4.3 years at 30 minutes and about 6.7 years at hourly uploads. A static IP address shortens each connection and extends those figures. Soil changes slowly, so half-hourly or hourly uploads suit most crops. These are estimates, not guarantees, and a weak Wi-Fi signal shortens them.

Nothing is lost. The sensor is its own soil data logger: it keeps measuring and stores up to 30,000 records on the device, then uploads them when the Wi-Fi or the server comes back. At one reading every 15 minutes that is about 10 months of history, and at hourly readings more than three years.

Place the probe in the active root zone — commonly around 15 cm deep for row crops and about 5 cm to the side of a drip emitter, deeper for tree crops. Push it into undisturbed soil and firm the soil back around it so there are no air gaps. Allow 10 to 14 days for the soil to re-consolidate around the probe before acting on the readings.

Yes, it is made for continuous installation: corrosion-resistant stainless-steel electrodes on an epoxy-encapsulated body that read in clay, sandy, saline and wet soils. Only the probe goes in the ground. The transmitter is mounted above it on a pole or a wall, in an IP65 enclosure with an IP67 option.

Electrical conductivity, or EC, measures how easily the soil carries a current, which rises with the amount of dissolved salts. Because fertilisers are salts, EC in the root zone rises after fertigation and falls as nutrients are taken up or leached. A reading that climbs week after week points to salt building up. The probe reads EC in the soil as it stands, which also moves with moisture, so compare readings taken at similar moisture levels.

Salinity is followed through the EC reading: the more dissolved salt there is in the soil water, the higher the conductivity. The sensor measures EC from 0 to 10,000 µS/cm, and a high limit on EC makes it report as soon as that limit is crossed.

From 3 to 9 pH, to ±0.3 pH at 0.1 pH resolution, which covers agricultural soils from strongly acidic to alkaline. Soil pH controls how available nutrients are to the crop, which is why it is read alongside EC and NPK.

VWC is the proportion of a soil volume that is water — 25% VWC means a quarter of that soil volume is water. It is the measurement irrigation scheduling uses, because it tells you how much water is in the root zone. The sensor measures 0 to 100% VWC to ±5% at 0.1% resolution.

It provides the signal. Set a moisture limit in the Maya app and the sensor uploads the moment the soil crosses it; your platform or irrigation controller acts on that message to open or close a valve. The switching is done by the controller, not by the sensor.

It publishes over MQTT, HTTP and HTTPS, so it works with any MQTT broker or REST endpoint: AWS IoT Core, Microsoft Azure IoT Hub, Google Cloud, a private cloud or an on-premise server. There is no mandatory vendor cloud.

Yes. The Wi-Fi link uses WPA2-PSK or WPA3, and data is carried with TLS/SSL encryption to the server. The firmware is protected by secure boot and signed over-the-air updates.

With the Macnman Maya Android app over Bluetooth, standing next to the device: you choose the Wi-Fi network, enter the server details, and set the upload interval and alarm limits. Settings can also be changed later from the server.

Choose Wi-Fi when every probe sits within reach of an access point — greenhouses, polyhouses, nurseries, gardens and campuses — because there is no gateway or network server to set up. Choose LoRaWAN for open fields, orchards and plantations: the MacSync LSS X5 reads the same seven parameters and reports through a gateway that can be kilometres away.

The Wi-Fi model is battery-operated. A solar-powered 7-in-1 soil sensor is available in the LoRaWAN range: the MacSync LSS X5 with a 20 W panel and an 8,000 mAh rechargeable battery.

Yes, that is where a Wi-Fi soil sensor fits best: the structure is compact, one access point covers it, and each bed is valuable enough to instrument. Limits on moisture and EC protect the crop from drying out, over-watering and a build-up of salt.

The probe is specified for soil: clay, sandy, saline and wet soils. Soilless media such as cocopeat hold water and salts differently, so moisture and EC readings there are best treated as relative values and checked against a known sample. Tell us the medium before ordering.

It depends on how uniform the ground is. A common starting point is one sensor per irrigation zone or management block, placed in a representative spot, with more where the soil type, slope or crop differ. In a polyhouse that usually means one for each group of beds fed by the same valve.

Yes. Compare the first settled readings with a known reference: a laboratory soil test from the same spot for pH and NPK, and a hand-held meter or a weighed sample for moisture. Note the difference, and from then on use the sensor to follow change from that baseline.

Yes. The MacSync Wi-Fi 7-in-1 soil sensor is designed and manufactured by Macnman Technologies in Pune, Maharashtra. It is WPC compliant and conforms to RoHS.