Beetle BLE is another milestone in wearable electronics device area based Arduino Uno, which makes DIY users have more options in the project design. It is fully compatible with Bluno in instructions and procedures, supporting Bluetooth HID and ibeacon modes. And it not only supports USB programming, but also wireless programming method. DFR0339

Bluno - BLE with Arduino Uno

Plate from the Adafruit Feather series equipped with an ATmega32u4 microcontroller and a small prototype surface (5x7). The chip contains 32KB flash memory, 2KB RAM memory and built-in USB support. The plate is compatible with Arduino. Adafruit 2771

DFRobot DFR0355 is a versatile development board that combines GSM, GPRS, and GPS functions into one compact device. With the ATmega32u4 microcontroller and integrated SIM808 module, this board is ideal for applications such as vehicle tracking, remote communication, satellite positioning, and IoT projects. Built-in power-saving features and battery power make it an excellent choice for applications requiring low power consumption and reliable operation in various conditions. DFRobot DFR0355

Adafruit 1500

This board combines the simplicity of the UNO’s Optiboot bootloader (which is used in the Pro series), the stability of the FTDI (which we all missed after the Duemilanove was discontinued) and the R3 shield compatibility of the latest Arduino UNO R3.  SparkFun DEV-13975

Development kit with ATSAMD21E microcontroller with ARM Cortex M0+ core. The chip can be clocked at 48 MHz, has a built-in 256 KB of Flash memory and 32 KB of SRAM. The module has a Qwiic connector. SparkFun DEV-15423

Evaluation kit with Sparkfun Artemis Bluetooth 5.0 module designed on the basis of the Feather kit. It has a USB C. The board also has a USB-UART converter, a microphone and a JTAG debugging connector. Artemis has support in the Arduino IDE. SparkFun WRL-15574

Development board with ATmega328P microcontroller equipped with 14 I/O lines, 6 PWM channels, 6 analog inputs and FT231X chip. Compatible with Arduino UNO Rev3. Cytron CT-SE

IoT development board the size of Arduino, equipped with an ARM Cortex-M3 processor (STM32F205) and a Wi-Fi communication module (with an integrated antenna and uFL connector). SparkFun DEV-13321

Qduino Mini is a tiny, Arduino-compatible board with ATmega32u4 (8MHz, 32kB Flash, 2kB RAM), a LiPol battery connector and charger built-in. SparkFun DEV-13614

Board with the ATmega328 microcontroller from the AVR family, there are 20 I/O lines, 6 PWM channels, 6 analog inputs at the user\'s disposal. SparkFun DEV-15123

Development kit with ATSAMD51J20 microcontroller with ARM Cortex M4F core. It is clocked at 120 MHz, has 1 MB of Flash and 256 KB of SRAM. There are 6 SERCOM interfaces on the board. SparkFun DEV-14713

Development kit with SAMD21G18A microcontroller with ARM Cortex M0+ core and LoRa RFM95W radio communication module. SparkFun WRL-15836

A miniature development board with ATtiny85 microcontroller, on which 6 I / O pins were derived. The module is supported by Arduino IDE. modATT85

Evaluation kit with Bluetooth 5.0 Sparkfun Artemis module. Equipped with a microphone, kmaers and accelerometer. SparkFun DEV-16828

Evaluation kit with Bluetooth 5.0 Sparkfun Artemis module. Equipped with a microphone, kmaers and accelerometer. Himax HM01B0 camera included. SparkFun KIT-17071

The A-Star 32U4 Mini ULV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up regulator that allows it to be powered efficiently from a 0.5 V to 5.5 V supply. Pololu 3102

The A-Star 32U4 Mini LV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up/step-down regulator that allows it to be powered efficiently from a 2.7 V to 11.8 V supply. Pololu 3103

Development board with ATmega4809 microcontroller and Microchip ECC608 cryptographic chip. It is equipped with 6 analog input pins, 14 digital inputs/outputs (5 as PWM output) and Grove ports. Seeed Studio 102010288