# 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. **21 device listed.** ## LILYGO T3 STM32 STM32WL55CCU6 LoRa development board with dual Cortex-M4 + M0+ cores, built-in LoRa/FSK/MSK radio at 433/868/915MHz, 0.96-inch SSD1315 OLED, 256KB Flash, 64KB RAM, and open-source Arduino/STM32CubeIDE firmware support. [Details](https://openhardware.directory/devices/lilygo-t3-stm32) | [Markdown](https://openhardware.directory/devices/lilygo-t3-stm32/md) ## Ai-Thinker Ra-09-DTU Intelligent wireless LoRaWAN DTU with isolated RS485 interface, powered by STM32WLE5CCU6 ARM Cortex-M4 MCU with integrated Sub-GHz radio. Wide 6-36V input for industrial deployment. [Details](https://openhardware.directory/devices/ai-thinker-ra-09-dtu) | [Markdown](https://openhardware.directory/devices/ai-thinker-ra-09-dtu/md) ## Adafruit Feather M0 Bluefruit LE ARM Cortex-M0+ dev board with Bluetooth LE (nRF51822) in the compact Feather form factor. Features 256KB flash, 32KB RAM, native USB, and a built-in LiPo charger for wireless wearable and IoT projects. [Details](https://openhardware.directory/devices/adafruit-feather-m0-bluefruit-le) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-bluefruit-le/md) ## Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500) ARM Cortex-M0+ Feather board with ATWINC1500 802.11 b/g/n WiFi, 256KB flash, 32KB RAM, 10 analog inputs, and built-in LiPo charger. FCC-certified WiFi for IoT and connected projects. [Details](https://openhardware.directory/devices/adafruit-feather-m0-wifi) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-wifi/md) ## Adafruit Feather M0 WiFi with uFL Variant of the Feather M0 WiFi (ATSAMD21 + ATWINC1500) with a u.FL antenna connector instead of a PCB trace antenna, allowing use of an external antenna for improved WiFi range. [Details](https://openhardware.directory/devices/adafruit-feather-m0-wifi-ufl) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-wifi-ufl/md) ## Arduino MKR1000 Compact Arduino board with SAMD21 ARM Cortex-M0+ and ATSAMW25 integrated WiFi (802.11 b/g/n) with cryptochip and SSL support. Built-in LiPo charger, 8 digital I/O, and 7 analog inputs in a slim 65mm form factor. [Details](https://openhardware.directory/devices/arduino-mkr1000) | [Markdown](https://openhardware.directory/devices/arduino-mkr1000/md) ## Adafruit Feather M0 RFM69HCW 868/915 MHz ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM69HCW sub-GHz radio at 868/915 MHz. Up to +20 dBm TX power, AES-128 encryption, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw-868-915) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw-868-915/md) ## Adafruit Feather M0 RFM69HCW 433 MHz ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM69HCW sub-GHz radio at 433 MHz. Up to +20 dBm TX power, AES-128 encryption, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw-433) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw-433/md) ## Adafruit Feather M0 RFM95 LoRa 900 MHz ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM95W SX1276 LoRa radio for 868/915 MHz. Achieves 2+ km range, supports LoRaWAN, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm95-lora-900) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm95-lora-900/md) ## Adafruit Feather M0 RFM96 LoRa 433 MHz ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM96W SX1278 LoRa radio for 433 MHz. Achieves 2+ km range, supports LoRaWAN, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm96-lora-433) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm96-lora-433/md) ## Adafruit Trinket M0 Ultra-compact ATSAMD21E18 ARM Cortex-M0+ board at 48 MHz with 256KB flash, 32KB RAM, 5 GPIO pins, built-in RGB DotStar LED, capacitive touch, native USB, and CircuitPython support. Weighs just 1.4g in 27mm × 15mm form factor. [Details](https://openhardware.directory/devices/adafruit-trinket-m0) | [Markdown](https://openhardware.directory/devices/adafruit-trinket-m0/md) ## Adafruit Feather M0 RFM69HCW Packet Radio (868/915 MHz) ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM69HCW sub-GHz radio at 868/915 MHz. Up to +20 dBm TX power, AES-128 encryption, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm69hcw/md) ## Adafruit Feather M0 RFM96 LoRa Radio (433 MHz) ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM96 LoRa radio at 433 MHz. Spread-spectrum modulation for long-range links, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm96) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm96/md) ## Adafruit Feather M0 RFM95 LoRa Radio (868/915 MHz) ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM95 LoRa radio at 868/915 MHz. Spread-spectrum LoRa modulation for multi-kilometre range, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger. [Details](https://openhardware.directory/devices/adafruit-feather-m0-rfm95) | [Markdown](https://openhardware.directory/devices/adafruit-feather-m0-rfm95/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) ## 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) ## Arduino Nano R4 The newest Arduino Nano — Renesas RA4M1 ARM Cortex-M4F at 48MHz with 256KB flash, 32KB SRAM, Qwiic connector, RGB LED, castellated pins, and USB-C in an ultra-compact 43×17mm form factor. No wireless, pure embedded power. [Details](https://openhardware.directory/devices/arduino-nano-r4) | [Markdown](https://openhardware.directory/devices/arduino-nano-r4/md) ## Arduino MKR WAN 1310 LoRa-enabled IoT board with SAMD21 ARM Cortex-M0+ at 48MHz, Murata CMWX1ZZABZ LoRa module, ECC508 crypto chip, 2MB SPI flash, onboard LiPo charger, and 104\u00b5A low-power mode — designed for long-range, battery-powered IoT sensor networks. [Details](https://openhardware.directory/devices/arduino-mkr-wan-1310) | [Markdown](https://openhardware.directory/devices/arduino-mkr-wan-1310/md) ## BigTreeTech SKR Mini E3 V1.2 Ultra-quiet 32-bit 3D printer board with 4 integrated TMC2209 UART stepper drivers. STM32F103RCT6 @ 72MHz. Direct drop-in replacement for Ender 3. Supports Marlin and Klipper. [Details](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v1-2) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v1-2/md) ## BigTreeTech SKR Mini E3 V2.0 Improved 32-bit control board with 4 integrated TMC2209 UART drivers, dual Z ports, and STM32F103RCT6 @ 72MHz. Drop-in upgrade for Ender 3, CR-10S, Ender 5. Marlin and Klipper ready. [Details](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v2-0) | [Markdown](https://openhardware.directory/devices/bigtreetech-skr-mini-e3-v2-0/md)