Open lab · electronics · firmware · 3D printing

From idea to a finished product

Capitlab shares knowledge and real-world projects in electronics, embedded firmware, IoT, automation and 3D printing, for engineers, students and makers.

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2: projects
11: articles
0: tutorials

capitlab ~ lab

$ capitlab status
● lab        online
● projects   2  built & documented
● articles   11
● tutorials  0
$ capitlab stack
STM32  ESP32-S3  CM4  CAN FD  BLE  Inventor
$

// 01 · Topics

What we build in the lab

Electronics & PCB Circuit design, multi-layer PCB layout, RF, power and hardware bring-up. 0 items Embedded firmware STM32 and ESP32 firmware, HAL, bootloaders, RTOS and embedded Linux. 11 items IoT & connectivity BLE, Wi-Fi, communication protocols and connected devices. 1 items Automation & control Motor control, CANopen, sensors and industrial systems. 0 items 3D printing & mechanics CAD design, product enclosures, FDM printing and assembly. 1 items Software & tools Desktop apps, debugging tools and sensor data processing. 0 items

// 02 · Projects

Latest projects

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3D printing & mechanicsOct 31, 2026

Orange Pi Enclosure (3D CAD)

A protective Orange Pi enclosure designed in Autodesk Inventor, ready for 3D printing.

3D Inventor CAD+1

IoT & connectivityOct 3, 2026

ESP32-S3 BLE-to-UART Bridge

Replacing a CC2541 module with an ESP32-S3 as a Bluetooth serial bridge for Windows PCs.

ESP32-S3 BLE UART+1

// 03 · Articles

Latest articles

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Nov 1, 2026

Embedded firmware9 min read

Communication Protocols on STM32 (Part 10): Ethernet and TCP/IP – MAC, PHY, RMII, LwIP and a TCP echo server

Ethernet on STM32, from the MAC, PHY and RMII architecture and LwIP and DHCP configuration to a TCP echo server using netconn, with calculated throughput figures and common faults. Part 10 of the Communication Protocols on STM32 series.

STM32 Ethernet LwIP TCP/IP+2

Nov 1, 2026

Embedded firmware9 min read

Communication Protocols on STM32 (Part 9): USB CDC – a virtual COM port and the classic pitfalls

USB CDC on STM32, from endpoints, Full-speed limits, CubeIDE setup and the 48 MHz clock to receive and transmit code with a ring buffer, with calculated throughput figures and common faults. Part 9 of the Communication Protocols on STM32 series.

STM32 USB CDC HAL+1

Nov 1, 2026

Embedded firmware13 min read

Communication Protocols on STM32 (Part 8): 1-Wire and DS18B20 – time slots, CRC8 and GPIO bit-banging

1-Wire on STM32 with the DS18B20 sensor, from time slots, ROM commands, the scratchpad and CRC8 (with verified examples) to two implementations, one with GPIO and one with a UART. Part 8 of the Communication Protocols on STM32 series.

STM32 1-Wire DS18B20 CRC8+1

// 04 · Tutorials

Beginner tutorials

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Have a project idea to bring to life?

From schematics, PCB and firmware to a 3D-printed enclosure, let’s turn it into a product.

Contact Capitlab