Microcontroller: ATmega168 or ATmega328V
Operating Voltage: 2.7-5.5 V
Digital I/O Pins: 14
PWM Channels: 6
Analog Input Channels: 6
DC Current per I/O Pin: 40 mA
Power Supply: Operates from 2V to 5V
Automatic Reset: Supports automatic reset for easier programming
Flat Design: Completely flat back for easy integration

MCU: Powerful STM32F103C8T6
Performance: 72MHz work frequency
Memory: 64K flash memory, 20K SRAM
Voltage: 2.0-3.6V power, I/O
USB: Onboard Micro USB interface
Core: ARM Cortex-M3 32-bit CPU
Debug: SWD Mode support
Size: Compact 54mm x 22mm
Weight: Light at only 9g
Download Datasheet

Stackable Design: Easy to connect with ARDUINO.
Bluetooth Support: Enable wireless communication.
Power Output: Supports 3.3v and 5v.
Protocol: USB 2.0 compatible.
Software Support: X-CTU for configuration.

Portable Design: PCB installed inside aluminum alloy shell.
Interface Markings: Clearly marked for convenience.
Voltage Support: 5V and 3.3V available simultaneously.
Laser Engraved: Permanent clarity on shell text.
Motherboard Protection: 500MA internal resettable fuse.
SWIM Connection: Via pin header or 2.54 mm pitch connector.
SWIM Speed: Supports 9.7 Kbytes/s and 12.8 Kbytes/s.
Status LED: Red and blue indicators for device status.

USB-TTL Converter: Facilitates communication.
Logic Level: 5V compatibility.
Operating Supply Voltage: Stable 5V power.
Digital I/O Pins: 14 versatile pins.
Analog I/O Pins: 6 dynamic inputs.
WiFi Supported: 802.11 b/g/n connectivity.
Memory: Generous 8MB storage.
Micro USB: Convenient connection.

Compatibility Worked with Arduino Nano.
Driver Capacity 3 axis stepper motor driver.
Machine Compatibility Micro-drive laser engraving and three-axis CNC engraving machines.
Current Control 2A can be controlled within the two-phase four-wire stepper motor.
Interface Released the digital IO interface, easy to connect to other modules like ENDSTOP.
I2C Interface Connect to LCD I2C or another I2C module.
Power Supply Power DC5V interface, 7.5-12V voltage input.
Compatibility GRBL compatible.