RS485 Gateway Dev2
About the RS485 Gateway Dev2 PCB
RS485 Gateway Dev2 is an open source ESP32 PCB design by aayu0-0, published on GitHub. It is a 2-layer board measuring 57.8 × 18.1 mm, with 21 components from 14 distinct parts.
Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the SP3485EN and AMS1117-3.3. By type, the board carries 7 resistors, 6 capacitors, 3 ICs, 2 connectors, 2 switches and 1 diode.
It belongs with the iot & wireless designs in this gallery.
From the project
An STM32-based RS485 to Wi-Fi gateway supporting Modbus communication for industrial IoT applications.
A custom hardware gateway designed to interface industrial RS485/RS422 devices with an ESP32-S3-based WiFi system. The design features dual RS485 channels, galvanic isolation, robust power protection, USB-C programming, and industrial-grade surge protection.
Industrial communication networks often rely on RS485 due to its long-distance capability and noise immunity. This project implements a dual-channel RS485-to-WiFi gateway that enables serial devices to communicate with an ESP32-S3 for wireless connectivity and data processing.
Main components on the RS485 Gateway Dev2
RS485 Gateway Dev2 bill of materials (BOM)
21 components, 14 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SP3485EN | SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | ESP32-S3-WROOM-1 | ESP32-S3-WROOM-1 | U2 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U3 |
| 1 | DB9_Socket | DSUB-9_Socket_Horizontal_P2.77x2.54mm_EdgePinOffset9.40mm | J1 |
| 1 | USB_C_Receptacle_USB2.0_14P | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 2 | SW_Push | SW_PUSH_6mm | SW1, SW3 |
| 1 | SM712_SOT23 | SOT-23 | D2 |
| 3 | 100nF | C_1206_3216Metric | C1, C4, C10 |
| 2 | 10uF | C_1206_3216Metric | C2, C5 |
| 1 | 22uF | C_1206_3216Metric | C3 |
| 2 | 10k | R_1206_3216Metric | R1, R10 |
| 2 | 5.1k | R_1206_3216Metric | R2, R3 |
| 1 | 120 | R_1206_3216Metric | R4 |
| 2 | 560 | R_1206_3216Metric | R5, R6 |
RS485 Gateway Dev2 design files
The KiCad project lives in the aayu0-0/RS485-to-WiFi-Gateway repository on GitHub; these links point at the commit this page was built from.
RS485 Gateway Dev2: common questions
What microcontroller does the RS485 Gateway Dev2 use?
The RS485 Gateway Dev2 is built around the ESP32-S3-WROOM-1, from the ESP32 family.
How big is the RS485 Gateway Dev2 PCB?
The RS485 Gateway Dev2 measures 57.8 × 18.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the RS485 Gateway Dev2?
21 components, from 14 distinct parts. The full bill of materials is listed on this page.
Where can I download the RS485 Gateway Dev2 design files?
From the aayu0-0/RS485-to-WiFi-Gateway repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the RS485 Gateway Dev2 design in my own project?
The repository has no license, so all rights stay with aayu0-0. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the RS485 Gateway Dev2 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
More boards in RS485-to-WiFi-Gateway
Similar boards
ESP32Open Book Abridged Edition
joeycastillo
85 × 115 mm65 parts2LCC-BY-SA-4.08.1k
ESP32Badge
atopile
56.3 × 39 mm239 parts4LMIT4.0k
ESP32Esp32 minimal
36.2 × 26.8 mm20 parts2LMIT4.0k
ESP32Racer
StuckAtPrototype
36 × 50.2 mm70 parts4LApache-2.03.8k
ESP32Controller
29 × 74 mm58 parts4LApache-2.03.8k
ESP32Bitaxe
skot
56.5 × 99.8 mm86 parts4LCERN-OHL-S-2.01.4k