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Esp32-modbus serial adapter

tomasmcguinness·esp32-modbus-serial-adapter·hardware/Modbus-Adapter.kicad_pcb

Esp32-modbus serial adapter PCB layout, top view — open source ESP32 board by tomasmcguinness

About the Esp32-modbus serial adapter PCB

Esp32-modbus serial adapter is an open source ESP32 PCB design by tomasmcguinness, published on GitHub. It is a 2-layer board measuring 27.9 × 41.7 mm, with 22 components from 14 distinct parts.

Its main chip is the ESP32-C6-MINI-1, from the ESP32 family. Other key parts include the MAX3485 and AP2112K-3.3. By type, the board carries 7 resistors, 6 capacitors, 3 ICs, 2 connectors, 2 switches and 2 diodes.

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

From the project

The hardware folder contains a KiCad PCB design, designed around the ESP32-C6-MINI-1. Both the antenna and non-antenna (U1) versions will work here due to the location of the ESP32.

The hardware folder contains a KiCad PCB design, designed around the ESP32-C6-MINI-1. Both the antenna and non-antenna (U1) versions will work here due to the location of the ESP32.

At present, these is one Matter example available. I plan on adding more now.

The first device supported by this project is the Eastron SDM120M Single Phase Energy Meter

The readings from this device will be exposed using as a Matter Electrical Sensor Device Type.

Main components on the Esp32-modbus serial adapter

ESP32-C6-MINI-1MAX3485AP2112K-3.3

Esp32-modbus serial adapter bill of materials (BOM)

22 components, 14 distinct parts.

QtyPartRefs
1
ESP32-C6-MINI-1
U1
1
MAX3485
U2
1
AP2112K-3.3
U4
1
USB_C_Receptacle_USB2.0_16P
J2
1
Conn_01x04_Pin
J4
2
SW_Push
SW1, SW2
2
LED
D1, D2
2
0.1µ
C1, C4
1
22µ
C2
2
1µF
C3, C7
1
1µ
C5
4
5.1K
R3, R4, R6, R8
2
10K
R5, R9
1
120
R10

Esp32-modbus serial adapter design files

The KiCad project lives in the tomasmcguinness/esp32-modbus-serial-adapter repository on GitHub; these links point at the commit this page was built from.

Esp32-modbus serial adapter: common questions

What microcontroller does the Esp32-modbus serial adapter use?

The Esp32-modbus serial adapter is built around the ESP32-C6-MINI-1, from the ESP32 family.

How big is the Esp32-modbus serial adapter PCB?

The Esp32-modbus serial adapter measures 27.9 × 41.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Esp32-modbus serial adapter?

22 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Esp32-modbus serial adapter design files?

From the tomasmcguinness/esp32-modbus-serial-adapter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Esp32-modbus serial adapter design in my own project?

The repository has no license, so all rights stay with tomasmcguinness. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Esp32-modbus serial adapter 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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