2 layers36.9 × 48.9 mm
RS485 Controller
tomrodinger/RS485_Controller
This integrates an ESP32-S3 module with an RS485 interface, so that it can be used to control Gearotons Servomotors or other RS485 devices
113 partsMIT
2 layers36.9 × 48.9 mm
RS485 Controller
tomrodinger/RS485_ControllerThis integrates an ESP32-S3 module with an RS485 interface, so that it can be used to control Gearotons Servomotors or other RS485 devices
- Size
- 36.9 × 48.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 109
- Nets
- 77
- Pads
- 311
- Tracks, vias
- 480, 152
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Oct 2025
- Updated
- 5 Nov 2026
Overview
RS485 Controller is an open-source printed circuit board by tomrodinger, from the tomrodinger/RS485_Controller repository on GitHub, published under the MIT licence. It is a 2-layer board of 36.9 × 48.9 mm with 109 parts on 77 nets, routed with 480 tracks and 152 vias.
It is built around the ESP32-S3-MINI-1U-N8, CH224K and TPS54202DDC, with the LM393DR2GH, SN74LVC1G00DCK and SP3485EN-Y among its other parts. Its parts include 27 resistors, 16 capacitors, 6 ICs, 6 diodes and 4 transistors. It belongs with the interfaces and adapters boards and the ESP32 boards of this library.
Main components
9
ESP32-S3-MINI-1U-N8
VFQFN-56-EP-40℃~+105℃ -98.4dBm 1.8V~3.6V、3V~3.6V 2.4GHz 21dBm 340mA 88mA Bluetooth5.0 ESP32-S3 UART、SDIO、SPI、I2C、I2S、JTAG、USB VFQFN-56-EP WiFi Modules ROHSEspressif SystemsWiFi Modules
CH224K
ESSOP-10-150mil-1mm-40℃~+90℃ 100W 4V~30V 5V、9V、12V、15V、20V Overvoltage Protection、Thermal Protection PD 3.0 Power Receiver Controller ESSOP-10-150mil-1mm USB PD ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
TPS54202DDC
SOT23-64.5V to 28V Input, 2A Output, EMI Friendly Synchronous Step Down ConverterTexas InstrumentsUncategorised
LM393DR2GH
SOP-8ESD Protection SOP-8 Comparators ROHSonsemiComparators
SN74LVC1G00DCK
SC-70-5-40℃~+125℃ 1 1.65V~5.5V 1.7V~2V 10uA 2 32mA 32mA 4.3ns@5V,50pF 700mV~800mV 74LVC Series NAND Gate SOT-353 Logic Gates ROHSTexas InstrumentsLogic Gates
SP3485EN-Y
SOP-8SOP-8 RS-485 / RS-422 ICs ROHSYLPTECRS-485 / RS-422 ICs
BSS84AK,215(ES)
SOT-23SOT-23 MOSFETs ROHSElecSuperMOSFETs
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky DiodesSM712
SOT-23-55℃~+125℃ 12A 16V、26V 1uA、2uA 2 300W 7.5V、13.5V 75pF 7V、12V Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOT-23 ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
README
PCB/V1_not_completed/README.mdUnfinished design archive
This directory contains hardware work that predates the datasheet task and is retained as an unfinished development archive. Its library files and manufacturing exports are not the released RS485 Controller design.
The released product remains RS2 / PCB revision 0.5 in ../0.5, covered by datasheet document revision 1.0. Do not interpret this directory name as a released hardware version or use these fabrication exports as the production package for PCB 0.5.
Parts
109| Qty | Value | Footprint | References |
|---|---|---|---|
| 44 | TestPoint | rs485RPihat:testpoint_no_border | TP1, TP2, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22, TP23 +28 |
| 6 | 100nF/50V | Capacitor_SMD:C_0603_1608Metric | C4, C7, C11, C12, C13, C16 |
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R6, R7, R8, R16, R19, R25 |
| 4 | 10nF | Capacitor_SMD:C_0603_1608Metric | C6, C9, C10, C14 |
| 4 | 4.7k | Resistor_SMD:R_0603_1608Metric | R21, R22, R28, R29 |
| 3 | 20k | Resistor_SMD:R_0603_1608Metric | R4, R13, R20 |
| 3 | BSS84AK,215 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R26, R27 |
| 2 | 10M | Resistor_SMD:R_0603_1608Metric | R17, R18 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R11, R12 |
| 2 | 22uF/6.3V | Capacitor_SMD:C_0603_1608Metric | C1, C3 |
| 2 | 560R | Resistor_SMD:R_0603_1608Metric | R1, R3 |
| 2 | 75R | Resistor_SMD:R_0603_1608Metric | R23, R24 |
| 2 | SW_Push | rs485RPihat:button | S1, S2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 10uF/25V | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 10uH | rs485RPihat:Inductor_7.3x6.6mm | L1 |
| 1 | 1N5819WS | Celebi:SOD323 | D2 |
| 1 | 1nF | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 1uF/25V | Capacitor_SMD:C_0603_1608Metric | C18 |
| 1 | 220R | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 22k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 47pF | Capacitor_SMD:C_0603_1608Metric | C17 |
| 1 | 49.9 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | CH224K | Package_SO:SSOP-10-1EP_3.9x4.9mm_P1mm_EP2.1x3.3mm | U6 |
| 1 | ESP32-S3-MINI-1U | RF_Module:ESP32-S2-MINI-1U | U7 |
| 1 | LM393DR2G | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Q_NMOS_GSD | Package_TO_SOT_SMD:SOT-23 | Q4 |
| 1 | SM712 | Celebi:SOT23-3 | D3 |
| 1 | SN74LVC1G00DCK | Package_TO_SOT_SMD:Texas_R-PDSO-G5_DCK-5 | U1 |
| 1 | SP3485EN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | Screw_Terminal_01x02 | rs485RPihat:2P_screw_terminal | J1 |
| 1 | TPS54202DDC | Package_TO_SOT_SMD:SOT-23-6 | U9 |
| 1 | TSM-108-01-T-SH-A-P-TR | conn:SAMTEC_TSM-108-01-T-SH-A-P-TR_hole1.5mm | J2 |
| 1 | TVS_5V | Celebi:SOT23-6L | D1 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_Palconn_UTC16-G | J5 |
| 1 | green | LED_SMD:LED_0805_2012Metric | D5 |
| 1 | red | LED_SMD:LED_0805_2012Metric | D6 |
| 1 | yellow | LED_SMD:LED_0805_2012Metric | D4 |
Questions
How big is the RS485 Controller PCB?
It measures 36.9 × 48.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RS485 Controller use?
109 parts, built around the ESP32-S3-MINI-1U-N8, CH224K, TPS54202DDC and LM393DR2GH. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the RS485 Controller KiCad files?
From the tomrodinger/RS485_Controller repository on GitHub, at the commit this page was made from: the board is PCB/0.1/0.1.kicad_pcb and its schematic PCB/0.1/0.1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RS485 Controller design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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