Features：
1.It has 14 digital IO pins, of which pins 3, 5, 6, 9, 10, 11 can be used as PWM output, and pins A0~A5 are analog input pins.
2.1 16Mhz crystal oscillator; 1 Micro Usb interface; 1 ICSP interface; 1 reset button and 1 function button; 10-bit LED running light driven by MOS tube; 2 RGB lights with WS2812 chip; one without Source buzzer, a buzzer switch; 500MA self-recovery fuse
3.It contains all the structures that make up the microcontroller, and only needs a MICRO usb data cable to connect to the computer, or use a battery to start.
4. The pin layout is the same as the original arduino, compatible with all expansion boards.

What are the improvements compared to the original arduino?

1. Added a function button connected to the D2 pin;
2. Added 2 RGB lights with chips, which can display any color through the program;
3. Add a passive buzzer, can play music through the program, and design a buzzer switch, you can turn off the buzzer at any time;
4. Added 10 LED marquees driven by MOS tubes, which avoids the problem of insufficient output current of the IO port of the single-chip microcomputer, and can directly drive a small DC motor through the IO port.
5. Added 3.3V power indicator
6. Change the USB-B type interface to MICRO-USB interface, which is more convenient to use
7. Upgrade the main control chip to ATMEGA328P-AU
8. More personalized pattern printing, highlighting individuality.
9. Add 500ma self-recovery fuse, short circuit automatically disconnect the circuit, avoid component damage.
10. Change the plug-in pin to the patch pin to avoid short circuit of the development board contact conductor, which is safer.