2 layers78 × 103 mm Embedded.old, the printed circuit board in 3D

Embedded.old

This project creates a flat cylindrical DNA model with: - Magnetic DNA bases with color-coded NeoPixel LEDs and unique resistor values for identification - Interactive base pairing game that validates correct DNA base…

Full screen GitHub .kicad_pcb

Size: 78 × 103 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 121
Nets: 116
Pads: 421
Tracks, vias: 831, 238
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 14 Aug 2026
Updated: 22 Sep 2026

Overview

Embedded.old is an open-source printed circuit board by borisg912, from the borisg912/3DNA repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 78 × 103 mm with 121 parts on 116 nets, routed with 831 tracks and 238 vias.

It is built around the SN74AHCT125N, ESP32-C6-WROOM-1-N8 and DW01A, with the BQ25895RTW, FSUSB30MUX and MP8715DN among its other parts. Its parts include 22 resistors, 19 capacitors, 13 connectors, 10 ICs and 9 transistors. It belongs with the ESP32 and RISC-V boards of this library.

Main components

README

README.md

3DNA - Interactive DNA Learning Model

3DNA is an educational 3D-printed DNA model that combines physical structure with interactive electronics to help students understand DNA base pairing through hands-on learning.

Website: Project showcase and app downloads

🧬 Project Overview

This project creates a flat cylindrical DNA model with:

Magnetic DNA bases with color-coded NeoPixel LEDs and unique resistor values for identification
Interactive base pairing game that validates correct DNA base connections
Smart home integration with multiple connectivity options
Companion applications for Android and Windows

📦 Components

Hardware

ESP32-C6 microcontroller on custom PCB (3-3.3V logic)
13 DNA bases (12 helix positions + 1 foundation) with NeoPixels and resistors
2x CD74HC4067 multiplexers: one at 3.3V for resistor voltage divider, one at 5V for NeoPixel control
SN74AHCT125N buffer gate for driving 5V signals from ESP32's 3V
TEMT6000 ambient light sensor for dynamic brightness control
MPU-6500 gyroscope/inclinometer for spatial orientation
DFPlayer Mini for audio feedback
BQ25895 power management IC with USB/USB-C quick charging (up to 9V, 25W@3A)
MP8715 voltage regulator (5-9V to 5V)
4x 18650 Li-ion batteries (user-replaceable) with per-cell protection: PPTC fuses + AO3401A + DW01 + FS8205A
FQP30N06L MOSFET for fan control
BAT54C Schottky diode
NeoPixel strips for visual effects (5V)
Touch button for user interaction
Backboard button for system functions

Software

ESP-IDF firmware for ESP32-C6
Android application for mobile control
Windows UWP application for desktop

🎯 Features

Interactive Learning Mode

Base Identification: Each base has a unique resistor value read via voltage divider
Color Coding: NeoPixels light up in base-specific colors (A, T, C, G)
Pair Validation: Check correct base pairing (A-T, C-G) with visual feedback
Error Highlighting: Wrong bases light up in red for easy identification

Smart Home Mode

Multi-protocol connectivity: Wi-Fi, Bluetooth/BLE, Zigbee, Thread
Remote control: Control NeoPixels via companion apps
Motion sensing: Gyroscope triggers commands on movement
Ambient lighting: Dynamic brightness based on environment

Power Management

Battery operation: 2-4 cell configuration
USB charging: With power delivery management
Sleep modes: Low-power states for battery conservation
Thermal management: Fan control based on temperature

🛠️ Development Status

Hardware: PCB design in KiCad (v4.1 final)
Firmware: ESP-IDF framework with modular components
Mobile: Android app foundation
Desktop: Windows UWP app starter

📁 Project Structure

text

3DNA/
├── Embedded/          KiCad PCB files
├── EmbeddedCode/      ESP32-C6 firmware (ESP-IDF)
├── AppAndroid/        Android mobile app
├── AppWindows/        Windows UWP desktop app
├── Website/           Project showcase website
└── Assets/            Graphics and media

📄 Documentation

🤝 Contributing

This is a school project developed for educational purposes. Contributions and feedback are welcome for improving the learning experience and technical implementation.

📜 License

This project is licensed under GNU GPL v3 - see LICENSE for details.

Built with passion for education and technology

Category and platform

ESP32 RISC-V

Project files

Show this board on your page

https://pcbkit.io/boards/borisg912/3DNA

The board's own page, for a message or a post.

Source

Repository: borisg912/3DNA
Board file: Embedded/Embedded.old.kicad_pcb
Commit: f29bc3c
Licence: GPL-3.0

Parts

121

Qty	Value	Footprint	References
25			, , , , , , , , , , , , , , , +9
9	10k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R5, R6, R9, R10, R11, R12, R13, R14
8	100	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R15, R16, R17, R18, R19, R20, R21, R22
6	100nF	Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C1, C11, C12, C13, C14, C17
6	MountingHole_2.5mm_Pad_TopBottom	MountingHole:MountingHole_2.5mm_Pad_TopBottom	Mount, Mount, Mount, Mount, Mount, Mount
5	10uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C5, C6, C7, C8, C17
4	AO3401A	Package_TO_SOT_SMD:TSOT-23_HandSoldering	Q3, Q5, Q7, Q9
4	Battery_Cell	Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical	BT1, BT2, BT3, BT4
4	DW01A	Package_TO_SOT_SMD:SOT-23-6	U4, U6, U9, U10
4	FS8205A	Package_SO:MSOP-8_3x3mm_P0.65mm	Q2, Q4, Q6, Q8
4	Polyfuse	Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder	F1, F2, F3, F4
3	10uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C2, C3, C4
2	1N5819	Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2
2	22uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C15, C16
2	5.1k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2
2	BackboardSw	Button_Switch_THT:SW_PUSH_6mm_H5mm	SW1, SW2
2	Conn_01x08	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J6, J7
2	HelixNeo	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal	J4, J4
2	SN74AHCT125N	all:DIP794W45P254L1930H508Q14	U7, U8
1	1.0uH	Inductor_SMD:L_Ferrocore_DLG-0403	L1
1	100k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R7
1	130	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R4
1	1uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C18
1	3.3~4.7uH	Inductor_SMD:L_Ferrocore_DLG-0403	L2
1	4.7uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C9
1	47nF	Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C10
1	52.3k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R8
1	BAT54C	Package_TO_SOT_SMD:SOT-23	D3
1	BQ25895RTW	Package_DFN_QFN:Texas_RTW_WQFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm_ThermalVias	U2
1	BaseNeoMUX	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J3
1	BaseResMUX	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J2
1	ESP32-C6-WROOM-1	PCM_Espressif:ESP32-C6-WROOM-1	U1
1	FQP27P06	Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown	Q1
1	FSUSB30MUX	Package_SO:MSOP-10_3x3mm_P0.5mm	U3
1	FanConnector	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal	J5
1	GyroBreakout	Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical	J1
1	HelixNeoSig-Cont	Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Horizontal	J12
1	LightSensor	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal	J9
1	MP8715	all:SOIC8_MP8001A_MNP	U5
1	Speaker	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal	J8
1	TouchButton	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal	J10
1	USB-C Breakout	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal	J11

The 119 most common of 121 parts.

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Questions

How big is the Embedded.old PCB?

It measures 78 × 103 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Embedded.old use?

121 parts, built around the SN74AHCT125N, ESP32-C6-WROOM-1-N8, DW01A and BQ25895RTW. 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 Embedded.old KiCad files?

From the borisg912/3DNA repository on GitHub, at the commit this page was made from: the board is Embedded/Embedded.old.kicad_pcb and its schematic Embedded/Embedded.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Embedded.old design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Overview

Main components

SN74AHCT125N

ESP32-C6-WROOM-1-N8

DW01A

BQ25895RTW

FSUSB30MUX

MP8715DN

AO3401A

FS8205A

BAT54C

FQP27P06