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Build a Subsurface Soil Moisture & Salinity Profile Array with ESP32 & RS485 Modbus
Comprehensive step-by-step engineering guide for deploying multi-depth industrial Modbus RTU soil moisture and salinity sensor chains using ESP32 and MAX485.
ESP32 DevKit V1 (Deep-Sleep Enabled Agritech Node)Industrial Soil Sensors: RS485 Modbus RTU Subsurface Probes (Volumetric Water Content [VWC], Electrical Conductivity [EC/Salinity], Temperature, NPK)Bus Transceiver: MAX485 / SP3485 Differential Half-Duplex Transceiver (Hardware UART2 on GPIO 16/17 with GPIO 4 DE/RE Direction Switching)Power Infrastructure: Switched High-Side P-Channel MOSFET Power Gate + 120Ω Differential Line TerminationTarget Search Intent: "MAX485 DE/RE control pin timing glitch ESP32", "Modbus CRC16 calculation mismatch ESP32", "RS485 120 ohm bus termination resistor", "Industrial soil salinity EC sensor Modbus code"1 Code • 0 CAD
Download verified Arduino C++ firmware, pinout table, and BOM for Build a Subsurface Soil Moisture & Salinity Profile Array with ESP32 & RS485 Modbus.
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