Project Overview I need a professional PCB designer to create a complete 4-layer PCB design for an automated agricultural watering system that controls 50 fig trees with expansion capability to 100 trees. What I'm Looking For An experienced PCB designer who can take my detailed technical specification and create production-ready PCB files (schematic + layout + Gerber files) for a complex IoT controller board. Project Complexity Board Size: 300mm × 250mm (11.8" × 9.8") Layers: 4-layer PCB Components: 40+ ICs/modules including ESP32-S3, multiple I2C devices Connectors: 100+ screw terminals and headers I2C Devices: 20+ devices on multiplexed I2C bus Power System: 12V input, dual buck/LDO regulation (5V @ 8A, 3.3V @ 3A) Your Deliverables - Complete schematic in KiCad, Eagle, or EasyEDA (source files) - 4-layer PCB layout with proper routing - Gerber files ready for JLCPCB/PCBWay manufacturing - Bill of Materials (BOM) with LCSC/Mouser/Digikey part numbers - Pick-and-place (CPL) files for SMT assembly - 3D render/preview of the board - Assembly drawing and component placement diagram - Design files in editable format Technical Requirements Summary ESP32-S3-WROOM-1 microcontroller 1× TCA9548A I2C multiplexer (TSSOP-24) 14× ADS1115 16-bit ADC (TSSOP-10) 5× PCA9685 PWM drivers (TSSOP-28) Power regulation: LM2596 buck converter + AMS1117-3.3 LDO 50× 3-pin screw terminals (moisture sensors) 50× 3-pin screw terminals (temperature sensors - 1-Wire bus) 50× valve control outputs via 4× 16-pin headers (relay interface) USB-C programming port Expansion port for second 50-tree board Environmental sensor ports (I2C) RTC with battery backup (DS3231) Status LEDs and test points Design Challenges Proper I2C routing for 20+ devices on shared bus Managing multiple I2C address configurations Power delivery to 50+ sensors and multiple modules EMI management with mixed digital/analog signals Thermal management for power components Clear silkscreen labeling for 50 tree positions 2-3 weeks for complete design Willing to pay milestone payments (50% upfront, 50% on completion) Must-Have Skills - 4-layer PCB design experience - KiCad, Eagle, or EasyEDA proficiency - ESP32 board design experience - I2C bus design and routing - Power supply design (buck converters, LDOs) - High pin-count designs (100+ connectors) - Manufacturing-ready Gerber generation Bonus Skills (Preferred) Experience with agricultural/IoT controller boards JLCPCB/PCBWay assembly experience Conformal coating recommendations for outdoor use DFM (Design for Manufacturing) expertise Selection Criteria When applying, please include: Your portfolio showing similar complexity PCB designs Which PCB design software you prefer (KiCad/Eagle/EasyEDA) Your estimated timeline for this project Any questions about the technical specification Your approach to the I2C bus routing challenge Examples of 4-layer boards you've designed Communication I'm available for daily check-ins via Fiverr messaging Video calls available if needed for complex discussions Quick responses to questions (usually within 24 hours) Important Notes This is a real agricultural automation project (not academic) Board will be manufactured by JLCPCB or PCBWay I may order 5-10 boards initially, more if successful Potential for future revisions/improvements (Version 2.0) Full credit given in project documentation if desired