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Rs485-spy injector

rmingon·rs485-spy-injector·hardware/hardware.kicad_pcb

Rs485-spy injector PCB layout, top view — open source ESP32 board by rmingon

About the Rs485-spy injector PCB

Rs485-spy injector is an open source ESP32 PCB design by rmingon, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 92 × 51 mm, with 44 components from 16 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the CH340C, AMS1117-3.3 and MAX3485. By type, the board carries 13 resistors, 10 connectors, 7 capacitors, 5 ICs, 2 transistors and 2 diodes.

It belongs with the iot & wireless designs in this gallery.

From the project

RS485 Spy is an open-source hardware tool for real-time monitoring, logging, and testing of RS-485 networks

ESP32 RS485 Hacker Suite is a mobile-integrated toolkit built around the ESP32 microcontroller, designed to interact with RS485-based communication systems. This system allows for full control, inspection, and injection of RS485 traffic — making it a valuable asset for penetration testers, reverse engineers, and industrial system analysts.

- RS485 Sniffing Monitor and log communication over RS485 in raw hex format. Useful for debugging, protocol analysis, or reverse engineering.

Rs485-spy injector, from the project README
From the project README

Main components on the Rs485-spy injector

CH340CESP32-WROOM-32AMS1117-3.3MAX3485

Rs485-spy injector bill of materials (BOM)

44 components, 16 distinct parts.

QtyPartRefs
1
CH340C
U1
1
ESP32-WROOM-32
U2
1
AMS1117-3.3
U3
2
MAX3485
U4, U5
2
BSS138
Q1, Q2
1
Conn_01x06
J1
2
Conn_01x03
J3, J5
1
USB_C_Receptacle_USB2.0_14P
J4
2
RJ45
J6, J7
4
Conn_02x08_Counter_Clockwise
J8, J9, J10, J11
5
SW_Push
BOOT1, BTN1, BTN2, BTN3, EN1
2
LED
D1, D2
7
C
C1, C2, C3, C4, C5, C6, C7
7
R_Small
R1, R2, R3, R4, R5, R12, R13
4
10K
R6, R8, R9, R11
2
120
R7, R10

Rs485-spy injector design files

The KiCad project lives in the rmingon/rs485-spy-injector repository on GitHub; these links point at the commit this page was built from.

Rs485-spy injector: common questions

What microcontroller does the Rs485-spy injector use?

The Rs485-spy injector is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Rs485-spy injector PCB?

The Rs485-spy injector measures 92 × 51 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rs485-spy injector?

44 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Rs485-spy injector design files?

From the rmingon/rs485-spy-injector 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-spy injector design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which rmingon chose for the repository.

Can I test firmware for the Rs485-spy injector 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.

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