🛠️ MAKER GUIDEApr 08, 2026•⏱️ 2 min read•🇳🇵 Tested in Nepal
Soil Salinity (EC) & Fertilizer Concentration Meter for Polyhouse Farming
Prevent fertilizer salt toxicity and nutrient lockout in commercial tomato and strawberry polyhouses with a precision electrical conductivity probe and Arduino.
🛠️ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
Curated components verified for this project. Check the items you need, adjust quantities, and add straight to cart:
Estimated Total (5/5 items):
NPR 2,550
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NPR 750
NPR 850
NPR 350
NPR 500
NPR 100
Soil Salinity (EC) & Fertilizer Concentration Meter for Polyhouse Farming
Over-application of chemical NPK fertilizers in closed polyhouse soils causes salt accumulation and root burn. This handheld meter measures soil electrical conductivity (mS/cm) with automated DS18B20 temperature compensation.
Hardware Bill of Materials (In Stock at Ghumti Pasal):
- Microcontroller: Arduino Nano V3.0 Solderless (Without Cable)
- Conductivity Sensor: TDS Sensor Meter V1.0 Board Module Water Meter Filter
- Temperature Compensation: DS18B20 Waterproof Digital Temperature Sensor 1m
- Telemetry Screen: 1602 (16x2) LCD Display with I2C/IIC interface - Blue Backlight
- Portable Power: 9V Battery + 10CM DC 9V 5.5*2.1mm Battery Button Power Plug
Circuit Pinout & Wiring Connections:
| Component / Sensor Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| TDS Meter VCC / GND | 5V / GND | Signal Conditioning Board Power |
| TDS Meter Analog (AOUT) | Pin A1 | Raw Soil Slurry Conductivity Voltage |
| DS18B20 VCC / GND | 5V / GND | Thermal Sensor Power |
| DS18B20 DATA | Pin D4 (with 4.7kΩ pull-up) | 1-Wire Soil Temperature (°C) Reading |
| 1602 LCD SDA | Pin A4 | I2C Data Line |
| 1602 LCD SCL | Pin A5 | I2C Clock Line |
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