Project1

TankSync RX — PCB Design

2-layer receiver board for a wireless tank monitoring system, built around the ESP32-DevKitC-VE and RYLR998 LoRa module. Designed in KiCad 10.0.

Overview

TankSync RX is the receiver-side PCB of a LoRa-based wireless monitoring system. It receives sensor data transmitted over 868/915 MHz LoRa and processes it via an ESP32 for display and relay control.

Key features:

• ESP32-DevKitC-VE as the main controller (Wi-Fi + Bluetooth + dual-core)
• RYLR998 LoRa UART module for long-range wireless communication
• 1.3" OLED display connector (4-pin, I2C)
• WS2812B LED data line with 470Ω series resistor
• 3x status LEDs with 330Ω current-limiting resistors
• JST PH 2.0mm power input connector
• JST XH 3-pin connector for external sensor/data interface
• Berg headers (13-pin + 10-pin) for future relay expansion
• Decoupling capacitors on all power rails
• GND copper pour on both layers

Board Specifications

Schematic

See /schematic/TankSync_RX_Schematic.pdf for the full schematic.

Key design decisions:

• LORA_RST tied to ESP32 IO12 with a 10KΩ pull-up (R2) to +3V3, allowing software-controlled LoRa reset
• R3 (470Ω) series data resistor from IO32 to LED_DATA line (protects ESP32 GPIO from WS2812B inrush)
• C6, C7, C8 (100nF SMD) decoupling capacitors placed close to ESP32 power pins
• C3, C4 (100µF THT) bulk decoupling on main power rail — these must remain THT (not changed to SMD)
• J1 (13-pin) and J2 (10-pin) Berg headers routed to ESP32 for future relay expansion board

Bill of Materials

Repository Structure

tanksync-pcb/
├── README.md
├── LICENSE
├── images/
│   └── 3D view.png
|   ├── TankSync-rx.png
|   ├── pcb-layout.png
├── gerbers/
│   └── TankSync_RX_Gerbers.zip
├── bom/
│   └── Project1.csv
└── kicad/
    ├── Project1.kicad_pro
    ├── Project1.kicad_sch
    ├── Project1.kicad_pcb
    └── Project1.net

Gerber Files

The /gerbers/ folder contains the complete Gerber set ready for fabrication:

Recommended fab services: JLCPCB, PCBWay, OSH Park (all accept this Gerber format directly).

Custom Library Dependency

This design uses two custom KiCad components from my public library:

• MyLibrary:RYLR998_Castellated_5P — REYAX RYLR998 LoRa module
• MyLibrary:ESP32-DEVKITC-VE — Espressif ESP32-DevKitC-VE dev board

To open this project in KiCad, you need to add the custom library first: 👉 gargsrishtii/kicad-parts-library

Follow the installation instructions in that repo's README before opening the .kicad_sch or .kicad_pcb files.

Pre-fab Checklist (Open Items)

• Zip and verify Gerbers in a Gerber viewer before ordering
• Confirm J4 JST PH part number against supplier stock
• Measure enclosure inner diameter against board outline

Design Tool

• KiCad 10.0 (PCB design)
• EasyEDA (cross-reference for component verification)

License

This hardware design is released under CERN-OHL-P v2 (Permissive Open Hardware License). Free to use, modify, and manufacture — no share-alike requirement. See LICENSE for full terms.

Part of the TankSync wireless monitoring system project. Custom KiCad library: gargsrishtii/kicad-parts-library