# device — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link.

**78 device listed.**

## LILYGO T-Echo

nRF52840 + SX1262 LoRa + L76K GPS all-in-one board with 1.54-inch e-paper display, 850mAh battery, Thread, Zigbee, and BLE 5.0 — runs Meshtastic, SoftRF, and custom NRF firmware out of the box.

[Details](https://openhardware.directory/devices/lilygo-t-echo) | [Markdown](https://openhardware.directory/devices/lilygo-t-echo/md)

## LILYGO T-QT C6

Tiny ESP32-C6 dev board with WiFi 6, BLE 5, Zigbee/Thread (802.15.4), 0.85" 128×128 touchscreen, LiPo battery charging, and breathing LED in a thumbnail-sized form factor.

[Details](https://openhardware.directory/devices/lilygo-t-qt-c6) | [Markdown](https://openhardware.directory/devices/lilygo-t-qt-c6/md)

## LILYGO T-Knob

Smart rotary encoder controller based on ESP32-C6 with WiFi 6, BLE 5, Zigbee/Thread, 4 RGB LEDs, buzzer, and magnetic Hall-effect knob for wireless volume control and smart home automation.

[Details](https://openhardware.directory/devices/lilygo-t-knob) | [Markdown](https://openhardware.directory/devices/lilygo-t-knob/md)

## LILYGO T-Panel S3

Dual-MCU smart panel (ESP32-S3 + ESP32-H2) with 4" 480×480 IPS LCD (ST7701S), WiFi, BLE, native Zigbee/Thread/Matter via H2 co-processor, and optional RS485/CAN FD expansion for wall-mounted smart home controllers.

[Details](https://openhardware.directory/devices/lilygo-t-panel-s3) | [Markdown](https://openhardware.directory/devices/lilygo-t-panel-s3/md)

## LILYGO T7-C6

Compact ESP32-C6 development board with WiFi 6, BLE 5, and IEEE 802.15.4 (Zigbee/Thread/Matter) support, featuring 4MB flash and USB-C for next-generation IoT protocols.

[Details](https://openhardware.directory/devices/lilygo-t7-c6) | [Markdown](https://openhardware.directory/devices/lilygo-t7-c6/md)

## LILYGO T-Echo Plus

Enhanced T-Echo with nRF52840, SX1262 LoRa, L76K GPS, BHI260AP IMU, 2400mAh battery, 1.54-inch e-paper display, vibration motor, buzzer, and 1/4-inch mount — Meshtastic-ready with extended runtime.

[Details](https://openhardware.directory/devices/lilygo-t-echo-plus) | [Markdown](https://openhardware.directory/devices/lilygo-t-echo-plus/md)

## LILYGO T-Lora C6

LILYGO T-Lora C6 is a compact LoRa development board combining the ESP32-C6 module with SX1262 radio, supporting Wi-Fi 6, Bluetooth 5 LE, Zigbee, Thread, and sub-GHz LoRa communication.

[Details](https://openhardware.directory/devices/lilygo-t-lora-c6) | [Markdown](https://openhardware.directory/devices/lilygo-t-lora-c6/md)

## LILYGO T-Echo Lite

Simplified T-Echo with nRF52840, SX1262 LoRa, and optional L76K GPS — a low-cost, low-power LoRa node and Meshtastic-compatible board for off-grid mesh networking.

[Details](https://openhardware.directory/devices/lilygo-t-echo-lite) | [Markdown](https://openhardware.directory/devices/lilygo-t-echo-lite/md)

## LILYGO T-Zigbee ESP32-C3 TLSR8258

Dual-MCU Zigbee development board combining ESP32-C3 (WiFi/BLE) and Telink TLSR8258 (Zigbee/BLE Mesh) — both run simultaneously for bridging Zigbee sensor networks to WiFi/cloud platforms.

[Details](https://openhardware.directory/devices/lilygo-t-zigbee-esp32-c3-tlsr8258) | [Markdown](https://openhardware.directory/devices/lilygo-t-zigbee-esp32-c3-tlsr8258/md)

## M5Stack NanoC6

Ultra-compact ESP32-C6 dev board by M5Stack with WiFi 6, BLE 5.0, Zigbee 3.0, and Thread/Matter support. RISC-V single-core at 160MHz, USB-C, RGB LED, and button in a tiny form factor.

[Details](https://openhardware.directory/devices/m5stack-nanoc6) | [Markdown](https://openhardware.directory/devices/m5stack-nanoc6/md)

## Sonoff Zigbee 3.0 USB Dongle Plus E

EFR32MG21-based Zigbee 3.0 USB coordinator dongle for Home Assistant and Zigbee2MQTT. A popular, reliable choice for building smart home Zigbee networks.

[Details](https://openhardware.directory/devices/sonoff-zigbee-3-0-usb-dongle-plus-e) | [Markdown](https://openhardware.directory/devices/sonoff-zigbee-3-0-usb-dongle-plus-e/md)

## Prokyber AI-on-the-Edge-Cam

Open-source ESP32-S3 camera board with PoE, microSD, and Stemma QT designed for AI-powered utility meter reading using the AI-on-the-edge-device firmware with TensorFlow Lite inference.

[Details](https://openhardware.directory/devices/ai-on-the-edge-cam) | [Markdown](https://openhardware.directory/devices/ai-on-the-edge-cam/md)

## DezKVM Go

Open-source KVM-over-USB device for controlling headless computers from your laptop. Features HDMI capture up to 1080p 25fps, virtual keyboard/mouse via USB HID, and a browser-based interface requiring no drivers.

[Details](https://openhardware.directory/devices/dezkvm-go) | [Markdown](https://openhardware.directory/devices/dezkvm-go/md)

## iCESugar-Pro FPGA Development Board

Open-source Lattice ECP5 FPGA dev board with 24K LUTs, 32MB SDRAM, 32MB SPI flash, 106 GPIO pins in DDR SODIMM form factor. Supports fully open-source toolchain (Yosys + Nextpnr) and RISC-V Linux.

[Details](https://openhardware.directory/devices/icesugar-pro) | [Markdown](https://openhardware.directory/devices/icesugar-pro/md)

## TimeHAT I226 NIC with PPS In/Out for RPi5

Open-source Raspberry Pi 5 PCIe HAT with Intel I226 2.5G Ethernet NIC, dual SMA connectors for 1PPS input/output, built-in TCXO, and M.2 slot for GNSS modules. Ideal for PTP grandmaster clocks.

[Details](https://openhardware.directory/devices/timehat-i226) | [Markdown](https://openhardware.directory/devices/timehat-i226/md)

## Louder Raspberry HAT Plus

Open-source Raspberry Pi audio HAT featuring TAS5825M Class-D amplifier with integrated DSP, delivering 32W per channel at 8 ohms. Includes 15-band parametric EQ, FIR filtering, DRC, IR input, and onboard step-down converter to power the Pi from 7-26V.

[Details](https://openhardware.directory/devices/louder-raspberry-hat-plus) | [Markdown](https://openhardware.directory/devices/louder-raspberry-hat-plus/md)

## Mesh Detect 2

Open-source ESP32-S3 device that detects FAA Remote ID drone broadcasts and BLE devices, reporting alerts over the Meshtastic LoRa mesh network. Uses XIAO ESP32-S3 + Heltec V3.

[Details](https://openhardware.directory/devices/mesh-detect-2) | [Markdown](https://openhardware.directory/devices/mesh-detect-2/md)

## PicoGlitcher V3

Open-source voltage glitching tool for hardware security research, based on Raspberry Pi Pico 2 (RP2350) with dual high-power MOSFETs, 4 selectable voltage levels, and adjustable Schmitt trigger inputs.

[Details](https://openhardware.directory/devices/picoglitcher-v3) | [Markdown](https://openhardware.directory/devices/picoglitcher-v3/md)

## pic0rick Pico Ultrasound Pulse-Echo System

OSHWA-certified open-source ultrasound development kit built around the Raspberry Pi Pico (RP2040). Features a 60 Msps 10-bit ADC, AD8331 time-gain amplifier, and three-level bipolar pulser for NDT and education.

[Details](https://openhardware.directory/devices/pic0rick) | [Markdown](https://openhardware.directory/devices/pic0rick/md)

## madflight FC3v2 RP2350B Flight Controller

Open-source flight controller board with RP2350B MCU, 10-DOF sensor suite (gyro, accelerometer, barometer, magnetometer), INA226 battery monitor, microSD with 4-bit SDIO, and DC-DC converter. 50.7x41.6mm, 6.3g.

[Details](https://openhardware.directory/devices/madflight-fc3v2-rp2350b) | [Markdown](https://openhardware.directory/devices/madflight-fc3v2-rp2350b/md)

## UPduino v3.1

A low-cost, fully open source FPGA development board built on the Lattice ICE40UP5K with 5.3K LUTs, on-board FTDI FT232H USB programmer, 4MB qSPI flash, and 39 GPIO pins on PMOD-compatible headers.

[Details](https://openhardware.directory/devices/upduino-v3-1) | [Markdown](https://openhardware.directory/devices/upduino-v3-1/md)

## BlueMicro PyKey60

Open-source 60% mechanical keyboard PCB with RP2040 MCU, per-key RGB NeoPixel LEDs, Kailh hot-swap sockets, onboard buzzer, and USB-C. Runs KMK and CircuitPython firmware.

[Details](https://openhardware.directory/devices/pykey60) | [Markdown](https://openhardware.directory/devices/pykey60/md)

## CUBEEK CubeSat Educational Kit

Open-source 1U CubeSat educational kit powered by Arduino Pro Mini with LoRa communication, multi-sensor payload (IMU, barometer, GPS, temperature), solar-powered EPS, and ground station dashboard for learning satellite engineering.

[Details](https://openhardware.directory/devices/cubeek-cubesat-educational-kit) | [Markdown](https://openhardware.directory/devices/cubeek-cubesat-educational-kit/md)

## ESP32-DIV V2.0

Open-source multi-band wireless development toolkit with ESP32-U, 2.8" ILI9341 TFT display, 5 antennas, and SD card slot covering WiFi, BLE, 2.4GHz, and Sub-GHz frequency bands for security research and spectrum analysis.

[Details](https://openhardware.directory/devices/esp32-div-v2) | [Markdown](https://openhardware.directory/devices/esp32-div-v2/md)

## Sonoff ZBMini

Zigbee 3.0 two-way smart switch in a tiny form factor that fits behind existing wall switches. Supports external switch input and works with Home Assistant, SmartThings, and other Zigbee hubs.

[Details](https://openhardware.directory/devices/sonoff-zbmini) | [Markdown](https://openhardware.directory/devices/sonoff-zbmini/md)

## Seeed XIAO 2-Channel WiFi AC Relay

ESP32-C6 based 2-channel AC relay module with WiFi 6, Zigbee 3.0, and Thread support. Compact relay board compatible with Arduino and ESPHome for smart home AC switching up to 10A per channel.

[Details](https://openhardware.directory/devices/seeed-xiao-2-channel-wifi-ac-relay) | [Markdown](https://openhardware.directory/devices/seeed-xiao-2-channel-wifi-ac-relay/md)

## Sonoff SNZB-01P

Zigbee 3.0 wireless button and scene switch with single, double, and long press actions. Battery-powered with CR2477 lasting up to 5 years. Works with Home Assistant, Zigbee2MQTT, and eWeLink.

[Details](https://openhardware.directory/devices/sonoff-snzb-01p) | [Markdown](https://openhardware.directory/devices/sonoff-snzb-01p/md)

## M5Stack Single Live Wire WiFi Smart Switch

ESP32-C6 based WiFi smart switch for single live wire AC power control. Supports WiFi 6 and Zigbee 3.0, fits standard wall boxes for home automation.

[Details](https://openhardware.directory/devices/m5stack-wifi-smart-switch) | [Markdown](https://openhardware.directory/devices/m5stack-wifi-smart-switch/md)

## WiFi Devboard for Flipper Zero

ESP32-S2-based WiFi development board for Flipper Zero enabling wireless firmware updates, Black Magic Probe debugging over USB and WiFi, and WiFi pentesting with PMKID capture and deauth capabilities.

[Details](https://openhardware.directory/devices/flipper-zero-wifi-devboard) | [Markdown](https://openhardware.directory/devices/flipper-zero-wifi-devboard/md)

## Flipper Zero Video Game Module

RP2040-powered expansion module for Flipper Zero with DVI-D video output, 6-axis IMU motion sensor, 14-pin GPIO breakout, and USB-C. Fully open-source firmware and schematics.

[Details](https://openhardware.directory/devices/flipper-zero-video-game-module) | [Markdown](https://openhardware.directory/devices/flipper-zero-video-game-module/md)

## Sonoff Zigbee Bridge Pro

ESP32-based Zigbee-to-WiFi gateway with CC2652P coordinator chip supporting 128 Zigbee devices. Flashable with Tasmota for local Zigbee bridge operation with Home Assistant via MQTT.

[Details](https://openhardware.directory/devices/sonoff-zigbee-bridge-pro) | [Markdown](https://openhardware.directory/devices/sonoff-zigbee-bridge-pro/md)

## DFRobot FireBeetle 2 ESP32-C5 Development Kit

ESP32-C5 RISC-V development kit with dual-band WiFi 6 (2.4/5GHz), BLE 5, Zigbee 3.0, Thread 1.3, and Matter support. Features solar charging, 21uA deep sleep, IO expansion board, and 18 digital I/O pins at just $8.90.

[Details](https://openhardware.directory/devices/dfrobot-firebeetle-2-esp32-c5) | [Markdown](https://openhardware.directory/devices/dfrobot-firebeetle-2-esp32-c5/md)

## makerdiary nRF52840-MDK USB Dongle

Open-source multi-protocol wireless USB dongle based on the Nordic nRF52840 SoC. Supports BLE 5.4, Thread, Zigbee, 802.15.4, NFC, and USB 2.0 with UF2 drag-and-drop bootloader. Priced at $12.99.

[Details](https://openhardware.directory/devices/makerdiary-nrf52840-mdk-usb-dongle) | [Markdown](https://openhardware.directory/devices/makerdiary-nrf52840-mdk-usb-dongle/md)

## Waveshare ESP32-C6-GEEK

Compact USB-A dongle development board with ESP32-C6 RISC-V MCU, 1.14\" IPS LCD, WiFi 6, BLE 5.0, Zigbee 3.0, Thread, and microSD slot for portable IoT projects.

[Details](https://openhardware.directory/devices/waveshare-esp32-c6-geek) | [Markdown](https://openhardware.directory/devices/waveshare-esp32-c6-geek/md)

## Waveshare ESP32-H2-Zero

Ultra-compact castellated ESP32-H2 development board with BLE 5.2, Zigbee 3.0, Thread 1.3, and Matter support. USB-C powered with WS2812 RGB LED, 15 GPIO pins, and 4MB flash in a tiny 23.5 x 15.2mm form factor.

[Details](https://openhardware.directory/devices/waveshare-esp32-h2-zero) | [Markdown](https://openhardware.directory/devices/waveshare-esp32-h2-zero/md)

## Arduino Nano Matter

Ultra-compact Matter/Thread/BLE development board based on Silicon Labs MGM240S, bringing official Matter support to the beloved Arduino Nano form factor at 45×18mm.

[Details](https://openhardware.directory/devices/arduino-nano-matter) | [Markdown](https://openhardware.directory/devices/arduino-nano-matter/md)

## Olimex ESP32-C6-EVB

Open-source hardware evaluation board with ESP32-C6, 4 mains-rated relays, 4 opto-isolated inputs, and WiFi 6/Thread/Zigbee/Matter connectivity for home and industrial automation.

[Details](https://openhardware.directory/devices/olimex-esp32-c6-evb) | [Markdown](https://openhardware.directory/devices/olimex-esp32-c6-evb/md)

## SparkFun Thing Plus Matter - MGM240P

Feather-compatible Matter/Thread/Zigbee/BLE dev board based on Silicon Labs MGM240P with Qwiic, LiPo charging, microSD, and +20dBm radio range.

[Details](https://openhardware.directory/devices/sparkfun-thing-plus-matter-mgm240p) | [Markdown](https://openhardware.directory/devices/sparkfun-thing-plus-matter-mgm240p/md)

## Olimex ESP32-C6-DevKit-Lipo

Breadboard-friendly open-source ESP32-C6 dev board with WiFi 6, Thread, Zigbee, BLE 5, built-in LiPo charger, and dual USB-C — all for under €9.

[Details](https://openhardware.directory/devices/olimex-esp32-c6-devkit-lipo) | [Markdown](https://openhardware.directory/devices/olimex-esp32-c6-devkit-lipo/md)

## Olimex ESP32-H2-DevKit-LiPo

Ultra-affordable open-source ESP32-H2 dev board for Thread, Zigbee, and Matter — BLE 5, LiPo charging, Qwiic/Stemma, dual USB-C, for €5.95.

[Details](https://openhardware.directory/devices/olimex-esp32-h2-devkit-lipo) | [Markdown](https://openhardware.directory/devices/olimex-esp32-h2-devkit-lipo/md)

## DFRobot FireBeetle 2 ESP32-C6

Low-cost ESP32-C6 IoT board with WiFi 6, BLE 5, Thread, Zigbee, Matter, solar panel charging with MPPT, and ultra-low 16µA deep sleep — for $5.90.

[Details](https://openhardware.directory/devices/dfrobot-firebeetle-2-esp32-c6) | [Markdown](https://openhardware.directory/devices/dfrobot-firebeetle-2-esp32-c6/md)

## DFRobot Beetle ESP32-C6

Coin-sized (25×20.5mm) ESP32-C6 wearable dev board with WiFi 6, BLE 5, Thread, Zigbee, Matter, integrated LiPo charger, and 14µA deep sleep — for $4.90.

[Details](https://openhardware.directory/devices/dfrobot-beetle-esp32-c6) | [Markdown](https://openhardware.directory/devices/dfrobot-beetle-esp32-c6/md)

## Seeed Studio XIAO ESP32C6

Thumb-sized (21×17.8mm) Matter/Thread/Zigbee/WiFi 6/BLE 5.3 dev board with dual RISC-V cores, onboard antenna, 15µA deep sleep, and hardware security — for ~$5.

[Details](https://openhardware.directory/devices/seeed-xiao-esp32c6) | [Markdown](https://openhardware.directory/devices/seeed-xiao-esp32c6/md)

## Adafruit ESP32-C6 Feather

Open-source Feather-form-factor ESP32-C6 board with WiFi 6, BLE 5, Thread, Zigbee, STEMMA QT, NeoPixel, LiPo charging with MAX17048, and CircuitPython support — $14.95.

[Details](https://openhardware.directory/devices/adafruit-esp32-c6-feather) | [Markdown](https://openhardware.directory/devices/adafruit-esp32-c6-feather/md)

## M5Stack NanoH2

Ultra-compact ESP32-H2 dev module with Thread 1.4, Zigbee 3.0, Matter, and BLE 5 — featuring a Grove port, IR transmitter, and RGB LED in a stamp-sized 23.5×12mm form factor.

[Details](https://openhardware.directory/devices/m5stack-nanoh2) | [Markdown](https://openhardware.directory/devices/m5stack-nanoh2/md)

## Espressif ESP Thread Border Router

Official Espressif dual-SoC development board combining ESP32-S3 (host) and ESP32-H2 (radio co-processor) to build Thread 1.3 border routers and Zigbee gateways with Matter support over WiFi.

[Details](https://openhardware.directory/devices/espressif-esp-thread-border-router) | [Markdown](https://openhardware.directory/devices/espressif-esp-thread-border-router/md)

## Espressif ESP32-C6-DevKitC-1

Official Espressif development board for the ESP32-C6, combining WiFi 6, BLE 5, and IEEE 802.15.4 (Thread/Zigbee/Matter) on a RISC-V single-core SoC — ideal for Matter-native IoT and smart home development.

[Details](https://openhardware.directory/devices/espressif-esp32-c6-devkitc-1) | [Markdown](https://openhardware.directory/devices/espressif-esp32-c6-devkitc-1/md)

## Adafruit PyGamer

Handheld gaming console and dev board powered by ATSAMD51J19 (120MHz Cortex-M4F) with a 1.8" TFT display, 5 NeoPixels, accelerometer, and Feather-compatible headers. Runs MakeCode Arcade, CircuitPython, or Arduino.

[Details](https://openhardware.directory/devices/adafruit-pygamer) | [Markdown](https://openhardware.directory/devices/adafruit-pygamer/md)

## Raspberry Pi 4 Model B

Flagship Raspberry Pi SBC with BCM2711 quad-core Cortex-A72 @ 1.5GHz, dual-band WiFi, Gigabit Ethernet, dual micro-HDMI 4K outputs, USB 3.0, and USB-C power. Available in 1GB, 2GB, 4GB, and 8GB LPDDR4 RAM variants.

[Details](https://openhardware.directory/devices/raspberry-pi-4-model-b) | [Markdown](https://openhardware.directory/devices/raspberry-pi-4-model-b/md)

## Adafruit HalloWing M4 Express

Skull-shaped ATSAMD51J19 dev board (120MHz Cortex-M4F) with a 1.54" 240×240 IPS TFT, 4 capacitive touch inputs, 4 NeoPixels, accelerometer, speaker driver, and LiPoly charging. Perfect for Halloween props and wearables.

[Details](https://openhardware.directory/devices/adafruit-hallowing-m4-express) | [Markdown](https://openhardware.directory/devices/adafruit-hallowing-m4-express/md)

## ESP32-C6-WROOM-1-N4 Module

Espressif ESP32-C6 WROOM module with 4MB flash and PCB antenna, supporting Wi-Fi 6 (802.11ax), Bluetooth 5 LE, Zigbee 3.0, and Thread — for soldering onto custom IoT hardware.

[Details](https://openhardware.directory/devices/esp32-c6-wroom-1-n4) | [Markdown](https://openhardware.directory/devices/esp32-c6-wroom-1-n4/md)

## ESP32-C6-WROOM-1-N8 Module

Espressif ESP32-C6 WROOM module with 8MB flash and PCB antenna, supporting Wi-Fi 6 (802.11ax), Bluetooth 5 LE, Zigbee 3.0, and Thread — for soldering onto custom IoT hardware.

[Details](https://openhardware.directory/devices/esp32-c6-wroom-1-n8) | [Markdown](https://openhardware.directory/devices/esp32-c6-wroom-1-n8/md)

## ESP32-C6-DevKitC-1-N8

Espressif reference development board for the ESP32-C6 with 8MB flash, Wi-Fi 6, Bluetooth 5 LE, Zigbee 3.0, Thread, RGB LED, dual USB-C ports, and full GPIO breakout.

[Details](https://openhardware.directory/devices/esp32-c6-devkitc-1-n8) | [Markdown](https://openhardware.directory/devices/esp32-c6-devkitc-1-n8/md)

## Circuit Playground Bluefruit

Round educational microcontroller with Nordic nRF52840 (64MHz Cortex-M4F + BLE), 10 NeoPixels, accelerometer, microphone, light sensor, speaker, 8 alligator-clip I/O pads, and USB. Runs CircuitPython, MakeCode, and Arduino.

[Details](https://openhardware.directory/devices/circuit-playground-bluefruit) | [Markdown](https://openhardware.directory/devices/circuit-playground-bluefruit/md)

## Adafruit Feather STM32F405 Express

High-speed Feather-form-factor dev board with STM32F405 ARM Cortex-M4F @ 168MHz, 1MB Flash, 192KB RAM, 2MB SPI Flash, USB-C, STEMMA QT, SD card socket, and LiPo charging. Adafruit's fastest CircuitPython board.

[Details](https://openhardware.directory/devices/adafruit-feather-stm32f405-express) | [Markdown](https://openhardware.directory/devices/adafruit-feather-stm32f405-express/md)

## Adafruit PyPortal Titano

Large-screen IoT display board with ATSAMD51J20 + ESP32 WiFi coprocessor, 3.5" 320×480 resistive touchscreen TFT, 8MB Flash, microSD, speaker, and USB-C. Designed for Python-powered internet-connected dashboards.

[Details](https://openhardware.directory/devices/adafruit-pyportal-titano) | [Markdown](https://openhardware.directory/devices/adafruit-pyportal-titano/md)

## ESP32-H2-DevKitM-1-N4S

Espressif development board for the ESP32-H2 with Bluetooth 5 LE, Zigbee 3.0, Thread, and Matter support, 4MB flash, USB-C, RGB LED, and full GPIO breakout — no Wi-Fi.

[Details](https://openhardware.directory/devices/esp32-h2-devkitm-1-n4s) | [Markdown](https://openhardware.directory/devices/esp32-h2-devkitm-1-n4s/md)

## Adafruit ItsyBitsy nRF52840 Express

Tiny breadboard-friendly Bluetooth LE board with Nordic nRF52840 Cortex-M4F @ 64MHz, 1MB Flash, 256KB RAM, 2MB QSPI Flash, 21 GPIO, and native USB — all in a 36×17.6mm footprint. Supports CircuitPython and Arduino.

[Details](https://openhardware.directory/devices/adafruit-itsybitsy-nrf52840-express) | [Markdown](https://openhardware.directory/devices/adafruit-itsybitsy-nrf52840-express/md)

## ESP32-H2-MINI-1 Module

Espressif ESP32-H2 MINI module with 4MB flash and PCB antenna, supporting Bluetooth 5 LE, Zigbee 3.0, Thread, and Matter — a compact bare module for custom PCB designs without Wi-Fi.

[Details](https://openhardware.directory/devices/esp32-h2-mini-1) | [Markdown](https://openhardware.directory/devices/esp32-h2-mini-1/md)

## Adafruit Feather nRF52840 Sense

Sensor-rich BLE Feather with Nordic nRF52840 (64MHz Cortex-M4F), 6 onboard sensors (9-DoF IMU, magnetometer, proximity/light, PDM mic, humidity, barometric pressure), 21 GPIO, and FCC/IC/TELEC certified.

[Details](https://openhardware.directory/devices/adafruit-feather-nrf52840-sense) | [Markdown](https://openhardware.directory/devices/adafruit-feather-nrf52840-sense/md)

## PJRC Teensy 4.1

High-performance microcontroller with NXP i.MX RT1062 ARM Cortex-M7 @ 600MHz, 1MB RAM, 2MB Flash, 100Mbps Ethernet PHY, SD card, 55 GPIO, dual 480Mbps USB, and 3 CAN Bus. Expanded Teensy 4.0 sibling.

[Details](https://openhardware.directory/devices/pjrc-teensy-4-1) | [Markdown](https://openhardware.directory/devices/pjrc-teensy-4-1/md)

## ESP32-S2-WROVER Module

Bare WiFi module with Espressif ESP32-S2 single-core Xtensa LX7 @ 240MHz, 4MB Flash, 2MB PSRAM, 802.11b/g/n, native USB 1.1 OTG, and SMD pads. Intended for integration onto custom PCBs, not a standalone dev board.

[Details](https://openhardware.directory/devices/esp32-s2-wrover-module) | [Markdown](https://openhardware.directory/devices/esp32-s2-wrover-module/md)

## ESP32-S2-WROVER-I Module with uFL

Bare WiFi module with ESP32-S2 Xtensa LX7 @ 240MHz, 4MB Flash, 2MB PSRAM, 802.11b/g/n, native USB OTG, and a uFL connector for an external antenna. Drop-in variant of the WROVER for improved RF range.

[Details](https://openhardware.directory/devices/esp32-s2-wrover-i-module-with-ufl) | [Markdown](https://openhardware.directory/devices/esp32-s2-wrover-i-module-with-ufl/md)

## ESP32-S2 Saola 1R Dev Kit

Espressif official ESP32-S2-WROVER development board with dual 20-pin headers (breadboard-friendly), 8MB Flash, 2MB PSRAM, WiFi, dual Micro-USB (native USB + UART bridge), NeoPixel RGB LED, and boot/reset buttons.

[Details](https://openhardware.directory/devices/esp32-s2-saola-1r-dev-kit) | [Markdown](https://openhardware.directory/devices/esp32-s2-saola-1r-dev-kit/md)

## ESP32-S2 Kaluga Dev Kit

Espressif's multimedia-focused ESP32-S2 evaluation platform bundling four extension boards: audio player, capacitive touch panel, 3.2" LCD display, and camera module. Designed to showcase ESP32-S2 human-computer interaction features.

[Details](https://openhardware.directory/devices/esp32-s2-kaluga-dev-kit) | [Markdown](https://openhardware.directory/devices/esp32-s2-kaluga-dev-kit/md)

## Adafruit Feather M4 CAN Express

CAN-bus-capable Feather with ATSAME51J19 ARM Cortex-M4F @ 120MHz, built-in CAN transceiver + 5V booster, USB-C, 21 GPIO, 2MB SPI Flash, dual DAC, and LiPo charging. Ideal for automotive and industrial CAN Bus projects.

[Details](https://openhardware.directory/devices/adafruit-feather-m4-can-express) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m4-can-express/md)

## FeatherS2 ESP32-S2

Full-featured ESP32-S2 Feather-compatible board by Unexpected Maker with 16MB Flash, 8MB QSPI PSRAM, WiFi, native USB-C, 21 GPIO, STEMMA QT, APA102 RGB LED, ambient light sensor, and dual 700mA LDOs.

[Details](https://openhardware.directory/devices/feathers2-esp32-s2) | [Markdown](https://openhardware.directory/devices/feathers2-esp32-s2/md)

## Adafruit Metro ESP32-S2

Arduino Uno-compatible WiFi dev board with ESP32-S2 single-core @ 240MHz, 4MB Flash, 2MB PSRAM, native USB-C, STEMMA QT, LiPoly charging, MAX17048 fuel gauge, barrel jack, and UNO shield compatibility.

[Details](https://openhardware.directory/devices/adafruit-metro-esp32-s2) | [Markdown](https://openhardware.directory/devices/adafruit-metro-esp32-s2/md)

## BBC micro:bit v2

Upgraded BBC micro:bit with Nordic nRF52833 Cortex-M4F, Bluetooth 5.1, 5×5 LED matrix, 2 buttons, capacitive touch logo, built-in speaker and MEMS microphone, edge connector, and low-power mode. Same form factor as v1.

[Details](https://openhardware.directory/devices/bbc-micro-bit-v2) | [Markdown](https://openhardware.directory/devices/bbc-micro-bit-v2/md)

## Raspberry Pi Compute Module 4

Industrial-grade embedded computer module with BCM2711 quad-core Cortex-A72 @ 1.5GHz, 1–8GB LPDDR4 RAM, optional 8–32GB eMMC and optional dual-band WiFi + Bluetooth 5.0. Available in 32 hardware variants on dual high-density connectors.

[Details](https://openhardware.directory/devices/raspberry-pi-compute-module-4) | [Markdown](https://openhardware.directory/devices/raspberry-pi-compute-module-4/md)

## Raspberry Pi CM4 IO Board

Official reference carrier board for the Raspberry Pi Compute Module 4. Exposes dual HDMI 2.0, Gigabit Ethernet, 2× USB 2.0, PCIe x1, dual camera/display FPC, microSD slot (for CM4 Lite), RTC, HAT headers, and barrel-jack power.

[Details](https://openhardware.directory/devices/raspberry-pi-cm4-io-board) | [Markdown](https://openhardware.directory/devices/raspberry-pi-cm4-io-board/md)

## Arduino MKR WiFi 1010

Compact IoT Arduino with SAMD21 Cortex-M0+ @ 48MHz, u-blox NINA-W102 WiFi + Bluetooth module, ATECC508 crypto chip, 256KB Flash, 32KB SRAM, USB full-speed, LiPo charging, and MKR shield compatibility.

[Details](https://openhardware.directory/devices/arduino-mkr-wifi-1010) | [Markdown](https://openhardware.directory/devices/arduino-mkr-wifi-1010/md)

## Arduino Uno R3

The quintessential beginner microcontroller board with ATmega328P @ 16MHz, 32KB Flash, 2KB SRAM, 14 digital I/O, 6 analog inputs, USB-B for programming, DC barrel jack, and the R3 expanded shield header. Open-source hardware.

[Details](https://openhardware.directory/devices/arduino-uno-r3) | [Markdown](https://openhardware.directory/devices/arduino-uno-r3/md)

## Adafruit Feather RP2040

Feather-form-factor board with Raspberry Pi RP2040 dual-core Cortex-M0+ @ 133MHz, 264KB SRAM, 8MB Flash, 21 GPIO, 4 ADC, 2 PIO peripherals, USB-C with UF2 bootloader, STEMMA QT, and LiPo charging. Runs CircuitPython and MicroPython.

[Details](https://openhardware.directory/devices/adafruit-feather-rp2040) | [Markdown](https://openhardware.directory/devices/adafruit-feather-rp2040/md)

## Adafruit ItsyBitsy RP2040

Tiny 36×18mm breadboard-friendly board with Raspberry Pi RP2040 dual-core Cortex-M0+ @ 133MHz, 264KB SRAM, 8MB Flash, 23 GPIO, 4 ADC, 2 PIO peripherals, and Micro-USB. Runs CircuitPython and MicroPython.

[Details](https://openhardware.directory/devices/adafruit-itsybitsy-rp2040) | [Markdown](https://openhardware.directory/devices/adafruit-itsybitsy-rp2040/md)

## ESP32-C6 DevKitC-1-N8

Official Espressif development board featuring the ESP32-C6 — a RISC-V single-core MCU with WiFi 6, BLE 5.0, Zigbee 3.0, Thread 1.3, and native Matter support. 8MB flash, USB-C JTAG/serial.

[Details](https://openhardware.directory/devices/esp32-c6-devkitc-1) | [Markdown](https://openhardware.directory/devices/esp32-c6-devkitc-1/md)

## ESP32-H2 DevKitM-1-N4S

Official Espressif development board for the ESP32-H2 — a RISC-V MCU purpose-built for 802.15.4 wireless protocols: BLE 5.3, Zigbee 3.0, Thread 1.3, and Matter. No WiFi. 4MB flash, USB-C with CH343P.

[Details](https://openhardware.directory/devices/esp32-h2-devkitm-1) | [Markdown](https://openhardware.directory/devices/esp32-h2-devkitm-1/md)

## Pine64 Ox64

Pico-sized RISC-V SBC powered by the Bouffalo Lab BL808 triple-core SoC with WiFi, BLE 5.0, and Zigbee. Features 64MB PSRAM, up to 16MB flash, microSD slot, USB-C with MIPI-CSI camera support, and 26 GPIO pins. Runs Linux, NuttX, and FreeRTOS. Priced from $6.

[Details](https://openhardware.directory/devices/pine64-ox64) | [Markdown](https://openhardware.directory/devices/pine64-ox64/md)