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4 layers30.8 × 38.5 mmESP32 C3Mini, the printed circuit board in 3D

ESP32 C3Mini

Ontim-Nath02/Custom-ESP32Mini-Board

A custom made board using KiCAD 9

Full screenGitHub.kicad_pcb
Size
30.8 × 38.5 mm
Copper layers
4
Thickness
1 mm
Parts
29
Nets
30
Pads
143
Tracks, vias
266, 41
Pours
5
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
22 May 2026
Updated
26 May 2026

Overview

ESP32 C3Mini is an open-source printed circuit board by Ontim-Nath02, from the Ontim-Nath02/Custom-ESP32Mini-Board repository on GitHub. It is a 4-layer board of 30.8 × 38.5 mm with 29 parts on 30 nets, routed with 266 tracks and 41 vias.

It is built around the ESP32-C3-WROOM-02-H4, AP2112K-3.3 and USBLC6-2SC6, with the PESD5V0L1ULD among its other parts. Its parts include 10 capacitors, 9 resistors, 3 ICs, 3 connectors and 2 switches. It belongs with the ESP32 and RISC-V boards of this library.

Main components

4

README

README.md

ESP32-Mini Development Board

A custom made board using KiCAD 9

A compact custom ESP32-based development board designed for embedded systems, IoT applications, and rapid prototyping. This PCB includes USB Type-C power input, onboard 3.3V regulation, reset & boot buttons, and accessible GPIO headers for easy development.

Features

  1. ESP32-MINI module based design
  2. USB Type-C power input
  3. Onboard 3.3V LDO regulator
  4. Reset and Boot buttons
  5. Easy-access GPIO pin headers
  6. Compact PCB layout
  7. Designed for embedded & IoT projects
  8. Antenna keep-out zone maintained for better wireless performance

Schematic Diagram

Schematic

PCB Editor Layout

PCB_Editor

PCB Layout

Front: PCB_Front

Back: PCB_Back

⚡Power Section

The board is powered through a USB Type-C connector. A 3.3V LDO regulator converts the 5V input into stable 3.3V required for the ESP32 module.

Reset & Boot Circuit

Dedicated:

  1. Reset button for restarting the ESP32
  2. Boot button for entering flashing/programming mode

Antenna Design

A keep-out zone has been maintained around the ESP32 antenna area to improve WiFi/Bluetooth signal performance.

Applications

  1. IoT Projects
  2. Home Automation
  3. Wireless Sensor Nodes
  4. Embedded Systems Learning
  5. Robotics & Automation

Software Used

KiCad

Parts

29
QtyValueFootprintReferences
510kResistor_SMD:R_0402_1005MetricR5, R6, R7, R8, R9
54u7Capacitor_SMD:C_0805_2012MetricC1, C2, C3, C4, C5
3100nCapacitor_SMD:C_0402_1005MetricC6, C9, C10
25k1Resistor_SMD:R_0402_1005MetricR1, R2
2SW_PushButton_Switch_SMD:SW_SPST_B3U-1000PSW1, SW2
2TBDCapacitor_SMD:C_0201_0603MetricC7, C8
2~Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_VerticalJ2, J3
10RResistor_SMD:R_0805_2012MetricR3
1AP2112K-3.3Package_TO_SOT_SMD:SOT-23-5U2
1CrystalCrystal:Crystal_SMD_3215-2Pin_3.2x1.5mmY1
1ESP32-C3-WROOM-02RF_Module:ESP32-C3-WROOM-02U3
1PESD5V0L1ULDDiode_SMD:D_SOD-882DD1
1TBOResistor_SMD:R_0201_0603MetricR4
1USBLC6-2SC6Package_TO_SOT_SMD:SOT-23-6U1
1USB_C_Receptacle_USB2.0_16PConnector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASVJ1

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Questions

How big is the ESP32 C3Mini PCB?

It measures 30.8 × 38.5 mm and has 4 copper layers, 1 mm thick.

What parts does the ESP32 C3Mini use?

29 parts, built around the ESP32-C3-WROOM-02-H4, AP2112K-3.3, USBLC6-2SC6 and PESD5V0L1ULD. 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 ESP32 C3Mini KiCad files?

From the Ontim-Nath02/Custom-ESP32Mini-Board repository on GitHub, at the commit this page was made from: the board is ESP32_C3Mini.kicad_pcb and its schematic ESP32-C3_Mini.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the ESP32 C3Mini design in my own project?

Its repository states no licence, so its author keeps all rights: ask Ontim-Nath02 before reusing the design.