# 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.

**19 device listed.**

## LILYGO T-Micro32 Plus

LILYGO T-Micro32 Plus is an upgraded compact ESP32 module with 8MB flash, 2MB PSRAM, expanded GPIO, and an improved RED C3 ceramic antenna for stronger wireless performance.

[Details](https://openhardware.directory/devices/lilygo-t-micro32-plus) | [Markdown](https://openhardware.directory/devices/lilygo-t-micro32-plus/md)

## LILYGO T-Micro32 V2.0

LILYGO T-Micro32 V2.0 is a 45%-smaller ESP32 PICO-D4 module with integrated IPEX antenna connector, designed for space-constrained embedded product designs.

[Details](https://openhardware.directory/devices/lilygo-t-micro32-v2) | [Markdown](https://openhardware.directory/devices/lilygo-t-micro32-v2/md)

## LILYGO LoRa V1.3

LILYGO LoRa V1.3 is an ESP32 development board with SX1276 LoRa radio at 868/915 MHz, optional 0.96-inch OLED display, Wi-Fi, BLE, and 4MB flash for IoT and LoRa applications.

[Details](https://openhardware.directory/devices/lilygo-lora-v1-3) | [Markdown](https://openhardware.directory/devices/lilygo-lora-v1-3/md)

## LILYGO T4

LILYGO T4 is an ESP32 development board with 8MB PSRAM, optional 2.2 or 2.4-inch ILI9341 TFT LCD display, Wi-Fi, Bluetooth 4.2 BLE, and Li-Po battery support.

[Details](https://openhardware.directory/devices/lilygo-t4) | [Markdown](https://openhardware.directory/devices/lilygo-t4/md)

## Grasshopper LoRaWAN Development Board

Ultra-compact 18x45mm LoRaWAN development board from Tlera Corp featuring Murata's FCC-certified CMWX1ZZABZ-078 module with STM32L082 Cortex-M0+ MCU and SX1276 LoRa radio, drawing just 2 uA in stop mode.

[Details](https://openhardware.directory/devices/grasshopper-lorawan-development-board) | [Markdown](https://openhardware.directory/devices/grasshopper-lorawan-development-board/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)

## 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)

## 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)

## 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)

## ESP32-S2 WROOM Module

The ESP32-S2 WROOM is an Espressif WiFi module with a single-core Xtensa LX7 at 240MHz, 4MB flash, 320KB SRAM, built-in PCB antenna, native USB OTG, and rich peripheral support — a cost-effective WiFi-only module (no Bluetooth) with USB capabilities for IoT and embedded designs.

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

## M5Stack FIRE V2.7

Feature-rich ESP32 IoT dev kit with 2.0" IPS display, 8MB PSRAM, 16MB flash, MPU6886 IMU, BMM150 magnetometer, 10x SK6812 RGB LEDs, microphone, speaker, microSD, 500mAh battery, and M5GO charging base.

[Details](https://openhardware.directory/devices/m5stack-fire-v2-7) | [Markdown](https://openhardware.directory/devices/m5stack-fire-v2-7/md)

## Heltec Turtle Board

Ultra-low-power LoRa development board with STM32L432KC ARM Cortex-M4 MCU and SX1276 transceiver, capable of 10-year battery life on AAA cells using the RadioShuttle peer-to-peer protocol.

[Details](https://openhardware.directory/devices/heltec-turtle-board) | [Markdown](https://openhardware.directory/devices/heltec-turtle-board/md)

## Heltec LoRa Kit 151

Ultra-low-power LoRaWAN development kit based on STM32L151CBU6 ARM Cortex-M3 MCU and Semtech SX1278 LoRa transceiver, with 6uA deep sleep current, integrated battery management, and CE certification.

[Details](https://openhardware.directory/devices/heltec-lora-kit-151) | [Markdown](https://openhardware.directory/devices/heltec-lora-kit-151/md)

## Arduino UNO R4 WiFi

Arduino's flagship UNO board upgraded with Renesas RA4M1 ARM Cortex-M4F at 48MHz, ESP32-S3 WiFi/BLE 5.0, built-in 12×8 LED matrix, 12-bit DAC, CAN bus, op-amp, and Qwiic connector — all in the classic UNO form factor at 5V.

[Details](https://openhardware.directory/devices/arduino-uno-r4-wifi) | [Markdown](https://openhardware.directory/devices/arduino-uno-r4-wifi/md)

## Arduino UNO R4 Minima

The affordable entry to Arduino's R4 generation — Renesas RA4M1 ARM Cortex-M4F at 48MHz with 256KB flash, 32KB SRAM, 12-bit DAC, CAN bus, op-amp, and USB-C in the classic UNO form factor at 5V. No wireless, pure microcontroller power.

[Details](https://openhardware.directory/devices/arduino-uno-r4-minima) | [Markdown](https://openhardware.directory/devices/arduino-uno-r4-minima/md)