Hello STEM UNO-R3-AIR in English

1. Introduction

This Arduino-compatible development board is based on the official version and adds 2.54 spacing G|V|S expansion pin interface, I2C interface, COM port, etc. This model offers two versions, soldered and unsoldered pin headers, with the unsoldered pin version having a considerable cost advantage, the soldered pin version can be used without an expansion board, with the same stability and quality as the official board.Compared to the official Arduino UNO, it significantly enhances the power supply capabilities, G|V can provide a maximum output power of 5V2A/3.3V1A, ensuring stable operation in complex projects, allowing 6-12VDC input, supporting DC5525 input interface, convenient for application in various mobile projects.

2, Technical Specifications

3, Features

• This is an enhanced compatible Arduino UNO development board, which has made a powerful upgrade based on the official board.
  
  1, Enhanced power supply, G|V can provide a maximum output of 5V2A/3.3V1A
  2, Onboard circuit protection and power selection circuit
  3, Onboard 2.54mm pitch G|V|S expansion pin interface, no expansion board required
  4, Type-C communication interface, no need to distinguish between positive and negative, more convenient
  5, Expose A6, A7 analog interfaces, can expand more functions
  6, Supports DC5525 input interface, allows 6-12VDC input
  

4, Circuit Board Size

5, Development board decoding

• ①Reset key
  Press the reset button and run the program again.

• ②USB serial chip
  This chip is responsible for converting the data received from USB into serial data for the main control chip.

• ③DC power interface and reinforced power supply module
  The power module is responsible for the power supply service of the motherboard, the 6-12V power supply from the external access is stepped down to 5V/2A/10W output, and can drive multiple servos, toy motors, miniature slides and other devices.

• ④Self-recovery fuse
  When the development board is connected incorrectly, causing a short circuit, the fuse will automatically disconnect the circuit connection between the development board and the computer, thereby protecting the computer USB port from being burnt or the computer from crashing.

• ⑤Type-C interface
  responsible for data download and USB power supply.

• ⑥Power switching chip
  FDN340P field effect transistor + LMV358IDGKR amplifier composed of external power supply and USB power supply automatic switching control system.The development board is powered by USB interface by default. When an external power source is connected, the controller will automatically disconnect the USB power and switch to external power supply. After the external power source is disconnected, it will automatically switch back to USB power supply. This feature can protect the computer from the power interference of the development board's external power supply.

• ⑦Microcontroller
  The ATMEGA328P microcontroller is the brain of the development board, responsible for program storage, execution, calculation processing, signal input and output, and other functions.

• ⑧Serial port chip
  This chip operates when writing initialization program to the development board or using the compiler to download the program.

• 9 LED indicator light
  The board is equipped with 4 LED indicators, (ON) is the power indicator, it lights up when powered on, (RX)(TX) are serial port signal indicators, the LED lights blink when there is serial port communication, (L) is the D13 pin indicator light, the light is on when the D13 signal is high.

• 10 ICSP serial data interface
  Connect this interface when writing the initialization program to the development board or using the compiler to download the program.

Notice

Hello STEM UNO R3 PRO equipped with a resettable fuse, which can protect the computer's USB port from short circuits and overcurrent.If an over 500 mA current is applied to the USB port, the fuse will automatically disconnect until the short circuit or overload is removed.

Another development board without焊接pin needles has the same performance, but it is best to use it with an expansion board!!!

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