HardLabs

Uext esp32-c3

LibreSolar·uext-esp32-c3·kicad/uext-esp32-c3.kicad_pcb

Uext esp32-c3 PCB layout, top view — open source ESP32 board by LibreSolar

About the Uext esp32-c3 PCB

Uext esp32-c3 is an open source ESP32 PCB design by LibreSolar, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 14 × 32 mm, with 13 components from 12 distinct parts.

Its main chip is the ESP32-C3-MINI-1-N4, from the ESP32 family. Other key parts include the AP2210K-3.3TRG1 and NUP4202W1T2G. By type, the board carries 5 capacitors, 3 ICs, 2 connectors, 2 resistors and 1 LED.

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

From the project

Bill of Materials: CSV file or interactive HTML BOM

Bill of Materials: CSV file or interactive HTML BOM

- UEXT connector to communicate with host MCU via UART - Flashing via built-in USB port - Internal power supply for firmware upgrades

This board can be programmed with Zephyr RTOS or ESP-IDF.

The hardware is licensed under the CERN Open Hardware Licence Version 2 - Weakly Reciprocal.

Documentation is licensed under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License.

Uext esp32-c3, from the project README
From the project README

Main components on the Uext esp32-c3

AP2210K-3.3TRG1NUP4202W1T2GESP32-C3-MINI-1-N4

Uext esp32-c3 bill of materials (BOM)

13 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AP2210K-3.3TRG1
AP2210-3.3
Diodes Inc.
U1
1
NUP4202W1T2G
NUP4202
On Semi
U2
1
ESP32-C3-MINI-1-N4
ESP32-C3-MINI-1
Espressif
U3
1
10103594-0001LF
USB_B_Micro
Amphenol FCI
J1
1
UEXT
any
J2
1
red
LED
any
LED1
2
2.2U
2.2u
any
C1, C2
1
1UF
1uF
any
C3
1
10UF
10uF
any
C4
1
100NF
100nF
any
C5
1
1k
any
R1
1
10K
10k
any
R2

Uext esp32-c3 design files

The KiCad project lives in the LibreSolar/uext-esp32-c3 repository on GitHub; these links point at the commit this page was built from.

Uext esp32-c3: common questions

What microcontroller does the Uext esp32-c3 use?

The Uext esp32-c3 is built around the ESP32-C3-MINI-1-N4, from the ESP32 family.

How big is the Uext esp32-c3 PCB?

The Uext esp32-c3 measures 14 × 32 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Uext esp32-c3?

13 components, from 12 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Uext esp32-c3 design files?

From the LibreSolar/uext-esp32-c3 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Uext esp32-c3 design in my own project?

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

Can I test firmware for the Uext esp32-c3 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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