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C3-pico

FrancoSpitale·c3-pico·hardware/c3-pico.kicad_pcb

C3-pico PCB layout, top view — open source ESP32 board by FrancoSpitale
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About the C3-pico PCB

C3-pico is an open source ESP32 PCB design by FrancoSpitale, published on GitHub under the MIT license. It is a 2-layer board measuring 28.4 × 51.5 mm, with 21 components from 15 distinct parts.

Its main chip is the ESP32-C3-WROOM-02-N4, from the ESP32 family. Other key parts include the AP2112K-3.3TRG1 and USBLC6-2SC6. By type, the board carries 6 resistors, 5 capacitors, 3 ICs, 3 connectors, 2 switches and 2 LEDs.

It belongs with the dev boards & breakouts, iot & wireless and usb & debug tools designs in this gallery.

From the project

Minimalist ESP32-C3 dev board — USB-C native USB, no UART bridge. KiCad 9, WIP (schematic ERC-clean).

A no-frills ESP32-C3 development board in KiCad 9: USB-C with native USB, 3.3 V LDO, BOOT/RESET buttons and every usable GPIO on two breadboard-friendly 0.1" rows. Designed to be the board you actually reach for — nothing on it that a blinky-to-production bring-up doesn't need.

Schematic: docs/schematic.svg · Source: hardware/

Module, not chip-down. ESP32-C3-WROOM-02 (PCB antenna, pre-certified RF) instead of a bare ESP32-C3 with discrete RF. On a hobby/prototyping board the ~US$1 premium buys you regulatory-certified radio and zero antenna-matching risk on a 2-layer board — chip-down C3…

C3-pico, from the project README
From the project README

Main components on the C3-pico

ESP32-C3-WROOM-02-N4AP2112K-3.3TRG1USBLC6-2SC6

C3-pico bill of materials (BOM)

21 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-WROOM-02-N4
ESP32-C3-WROOM-02
U1
1
AP2112K-3.3TRG1
AP2112K-3.3
U2
1
USBLC6-2SC6
U3
1
TYPE-C-31-M-12
USB-C
J1
2
1X09_HEADER
1x09_Header
J2, J3
1
EVQ-PUJ02K
BOOT
SW1
1
EVQ-PUJ02K
RESET
SW2
1
KT-0603R-GREEN
green
LED1
1
KT-0603R-BLUE
blue
LED2
1
CL10B104KB8NNNC
100nF
C1
1
CL10A106KP8NNNC
10uF
C2
3
CL10A105KB8NNNC
1uF
C3, C4, C5
2
RC0603FR-0710KL
10k
R1, R7
2
RC0603FR-075K1L
5k1
R3, R4
2
RC0603FR-071KL
1k
R5, R6

C3-pico design files

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

C3-pico: common questions

What microcontroller does the C3-pico use?

The C3-pico is built around the ESP32-C3-WROOM-02-N4, from the ESP32 family.

How big is the C3-pico PCB?

The C3-pico measures 28.4 × 51.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the C3-pico?

21 components, from 15 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 C3-pico design files?

From the FrancoSpitale/c3-pico 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 C3-pico design in my own project?

Yes, under the terms of its MIT license, which FrancoSpitale chose for the repository.

Can I test firmware for the C3-pico 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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