2 layers46.3 × 43.4 mm Carbon, the printed circuit board in 3D

Carbon

Carbon is an open-source indoor air quality sensing board designed for accurate VOC, temperature, and humidity monitoring.

Open in PCBKit

Size: 46.3 × 43.4 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 38
Nets: 41
Pads: 168
Tracks, vias: 278, 16
Pours: 1
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 4 Jul 2026
Updated: 15 Aug 2026

Overview

Carbon is an open-source printed circuit board by Enderman8843, from the Enderman8843/Carbon repository on GitHub. It is a 2-layer board of 46.3 × 43.4 mm with 38 parts on 41 nets, routed with 278 tracks and 16 vias.

It is built around the BME688, ENS210 and 74AHCT1G125SE-7-85, with the AP2112K-3.3TRG1, AP2120N-1.8TRG1 and ESP32-C6-MINI-1 among its other parts. Its parts include 13 capacitors, 7 resistors, 6 ICs, 2 diodes and 1 connector. It belongs with the ESP32 and RISC-V boards of this library.

Main components

README

README.md

Carbon

Why did I build this

As we know my nations air quality is pretty bad therefore I decided to make a air quality analyser to know the actual depth of this danger specially for my home

How to Use this

First connect this device via usb-c cable to your pc then download the firmware files Firmware\BUILD or build them using the ino file in firmware wait for sometime as the BME688 needs sometime to stabilize its reading then after that the neopixels will show the color according to the IAQ of your enviroiment (RED = BAD , GREEN = GOOD , AMBER= MODERATE)

*Note the firmware is untested

Working

This takes the reading of the Bosch IAQ sensor and the temperature sensor to give accurate condition of the enviroiment

PCB Layout

PCB Layout	Schematic / Wiring

PCB Render

Front	Rear

Case

BOM

Item	Description	Quantity	Unit Price ($)	Total Price ($)	URL
PCBA	Custom PCB Manufacturing (JLCPCB)	1	49.35	49.35	https://jlcpcb.com
Case	3D Printed Case (Will be Printed Myself	1	0.00	0.00	https://hackclub.com
ESP-32 C6 Mini-1	MCU	1	4.47	4.47	https://www.digikey.in/en/products/detail/espressif-systems/ESP32-C6-MINI-1-N4/17885796
BME688	VOC sensor	1	9	9	https://www.digikey.in/en/products/detail/bosch-sensortec/BME688/13681261
TOTAL				63.00

JLCPCB and Shipping

BOM PCBA

BOM (Bill of Materials)

Comment	Designator	Footprint	LCSC	Quantity
0.1uF	C13, C15, C3, C4, C5, C7, C8	C_0603_1608Metric	C125205	7
10K	R1, R2	R_0603_1608Metric	C15401	2
10uF	C10, C12, C14, C9	C_0603_1608Metric	C19702	4
1uF	C11	C_0603_1608Metric	C15849	1
220Ω	R5	R_0603_1608Metric	C23179	1
4.7kΩ	R10, R9	R_0603_1608Metric	C15401	2
47uF	C6	C_0603_1608Metric	C140782	1
5.1kΩ	R6, R7	R_0603_1608Metric	C23186	2
74AHCT1G125SE-7	U7	SOT-353_L2.2-W1.4-P0.65-LS2.4-BR	C151417	1
AP2112K-3.3TRG1	U5	SOT-25-5_L2.9-W1.6-P0.95-LS2.8-BL	C51118	1
AP2120N-1.8TRG1	U4	SOT-23_L2.9-W1.3-P1.90-LS2.4-BR	C460317	1
BME688	U6	LGA-8_L3.0-W3.0-P0.80_BME688	C3664478	1
ENS210	U1	AMS_QFN-4-1EP_2x2mm_P0.95mm_EP0.7x1.6mm	C2991202	1
ESP32-C6-MINI-1	U3	ESP32-C6-MINI-1	C5736265	1
SW_Push	Boot1, Reset1	SW_SPST_PTS647_Sx38	C720477	2
USB-C Receptacle USB2.0 14P	J1	USB_C_Receptacle_HRO_TYPE-C-31-M-12	C5143397	1
SK6812MINI	D1	LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm	—	1
SK6812MINI	D2	LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm	—	1

Parts

Qty	Value	Footprint	References
7	0.1uF	Capacitor_SMD:C_0603_1608Metric	C3, C4, C5, C7, C8, C13, C15
5	LOGO	LOGO	G*, G, G, G, G**
4	10uF	Capacitor_SMD:C_0603_1608Metric	C9, C10, C12, C14
2	10K	Resistor_SMD:R_0603_1608Metric	R1, R2
2	4.7k	Resistor_SMD:R_0603_1608Metric	R9, R10
2	5.1k	Resistor_SMD:R_0603_1608Metric	R6, R7
2	MountingHole	MountingHole:MountingHole_2.2mm_M2	H3, H4
2	SK6812MINI	LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm	D1, D2
2	SW_Push	Button_Switch_SMD:SW_SPST_PTS647_Sx38	Boot1, Reset1
1	1uF	Capacitor_SMD:C_0603_1608Metric	C11
1	220	Resistor_SMD:R_0603_1608Metric	R5
1	47uF	Capacitor_SMD:C_0603_1608Metric	C6
1	74AHCT1G125SE-7	easyeda2kicad:SOT-353_L2.2-W1.4-P0.65-LS2.4-BR	U7
1	AP2112K-3.3TRG1	easyeda2kicad:SOT-25-5_L2.9-W1.6-P0.95-LS2.8-BL	U5
1	AP2120N-1.8TRG1	easyeda2kicad:SOT-23_L2.9-W1.3-P1.90-LS2.4-BR	U4
1	BME688_C3664478	easyeda2kicad:LGA-8_L3.0-W3.0-P0.80_BME688	U6
1	ENS210	Package_DFN_QFN:AMS_QFN-4-1EP_2x2mm_P0.95mm_EP0.7x1.6mm	U1
1	ESP32-C6-MINI-1	RF_Module:ESP32-C6-MINI-1	U3
1	USB_C_Receptacle_USB2.0_14P	Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1

Questions

How big is the Carbon PCB?

It measures 46.3 × 43.4 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Carbon use?

38 parts, built around the BME688, ENS210, 74AHCT1G125SE-7-85 and AP2112K-3.3TRG1. 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 Carbon KiCad files?

From the Enderman8843/Carbon repository on GitHub, at the commit this page was made from: the board is PCB/Carbon.kicad_pcb and its schematic PCB/Carbon.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Carbon design in my own project?

Its repository states no licence, so its author keeps all rights: ask Enderman8843 before reusing the design.

Category and platform

ESP32 RISC-V

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/enderman8843-carbon" title="Carbon in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/enderman8843-carbon.jpg" alt="Carbon" width="1200" height="900">

A picture that opens the board, for a README

[![Carbon](https://pcbkit.io/embed/boards/enderman8843-carbon.jpg?size=s)](https://pcbkit.io/boards/enderman8843-carbon)

Source

Repository: Enderman8843/Carbon
Board file: PCB/Carbon.kicad_pcb
Commit: e39dc33
Licence: Not stated

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