Precision Agriculture IoT System Assembly

We are building a precision agriculture IoT field monitoring system. We need 5 complete sensor nodes and 1 central gateway assembled, wired, tested, and validated. The system should be ready for deployment in the field. The ideal candidate will have experience in electronics and IoT systems, ensuring all components are properly integrated and functioning as expected. Each sensor node (×5) must include: RS485 Modbus soil probe: soil moisture, EC, temperature (JXBS-3001-TR or equivalent) RS485 Modbus air sensor: temperature + humidity (XY-MD02 or equivalent) RS485 Modbus CO₂ sensor: 400–5000ppm NDIR (MH-Z19C or equivalent) RS485 Modbus leaf wetness sensor All sensors daisy-chained on single RS485 bus Solar powered: 3W monocrystalline panel + LiFePO4 battery + MPPT charge controller IP65-rated outdoor weatherproof enclosure with cable glands Pole-mount bracket (fits 25–32mm pole) Fully assembled, wired, bench-tested before delivery Gateway (×1) must include: Raspberry Pi Zero 2W or equivalent RAK2287 or equivalent LoRaWAN IN865 concentrator HAT 4G LTE modem (Jio/Airtel compatible) Outdoor weatherproof IP65 enclosure 4G antenna + LoRa antenna fitted Pre-configured, tested Also required: 1 × A5 laminated quick-start guide showing field deployment diagram, sensor placement depth, LED indicator codes, and QR code linking to our cloud dashboard. Component sourcing, buying, and complete assemble has to be done by the freelancer.