[Fully plug-in/compatible with Arduino Uno R3] Lengfan Development Board Type B Version 2 (plug-in)

###### Looking for other development boards? Please refer to [Miss Xing Yuandai's Development Board Introduction](https://oshwhub.com/article/ICMCU_board_series_guide)
###### Need to burn the BootLoader provided by Arduino for this development board to be compatible with corresponding products? Please refer to [Super detailed: How to burn BootLoader for your Arduino and compatible boards](https://oshwhub.com/article/Write-Arduino-BL)

# Copyright Notice and Other Important Tips

* ![Creative Commons License] * This work is compatible with the [Arduino UNO R3](https://docs.arduino.cc/hardware/uno-rev3) development board. This work has parts that refer to its hardware design and comply with the transitive nature of the CC-BY-SA agreement it adopts. "Arduino" is a trademark owned by Arduino Corporation.
* This work is a reference design for the ATmega328P-PU microcontroller ([Lichuang Mall Product C33901](https://item.szlcsc.com/34869.html)).

# Project Description

![CR-B-2-TH.cover.png]
This work is the second development board based on ATmega 328P designed by me. Compared with previous projects, this work has a friendly pin sorting and (almost) full direct plug layout while maintaining a small size.

### About direct plug layout

In order to reduce the difficulty of production as much as possible, this work uses direct plug-in components as much as possible. Only the CH340C chip has no corresponding direct plug product. Fortunately, its SOP-16 package is the easiest to solder among SMD components.

For the USB connector, there are two options. Please choose according to your own soldering skills and/or actual needs:

* **USB TYPE-B** connector, as the least loose version of the USB connector, it is widely used in a large number of scenarios including the original Arduino, and its full straight-insert installation method is very friendly to novices;
* **USB TYPE-C** connector, the best connector, its application range and expansion trend must be obvious to everyone; but the 16P SMD version has fine pins, which requires a certain understanding of soldering skills.

![4)@$T(DF(7~%JNA`6KC0{2Y.jpg]
![Y)H(FF`W1H8IT@R56SPU0OD.jpg]
### About BOM

**Please do not use the automatically generated BOM. **See the attachment for the actual BOM. This problem is caused by my development habits being different from LCEDA's automatic BOM logic, and I don't want to change it (

you know, component selection doesn't have to be based on the BOM). Especially the 1/8W color ring resistors used here, you can use the common 1/4W without any problem, just plug it in and bend the pins.

## Connectivity and Functionality

* Just plug in the USB cable, or provide 5.0V power through the 5V pin to meet all the working conditions of the MCU (if it is too high or too low, the development board may not work or even be damaged);
* 20 IOs arranged in an Arduino-compatible order;
* Optional USB Type-C connector and onboard full-speed driver-free USB 2.0 to UART Chip (CH340C), connected to UART 0;
* With a reset button, and 4 LED indicators to show the status of power, UART Rx/Tx, SCK (i.e. digital port 13, PB5);
* No separate ICSP burning port is set, if necessary, it can be connected from the GPIO connector.

## Configuring the development board

If you need to burn the BootLoader provided by Arduino for this development board to be compatible with the corresponding products, please refer to [Super detailed: How to burn the BootLoader for your Arduino and compatible boards](https://oshwhub.com/article/Write-Arduino-BL).

The following are some recommended reading materials.

* If you need to burn the BootLoader of Arduino for the development board to be compatible with the corresponding products, please visit [Bootloader | Arduino Documentation | Arduino Documentation](https://docs.arduino.cc/hacking/software/Bootloader) or refer to relevant tutorials on the Internet.
* If you need to install the USB to serial port driver to improve the stability of the serial port chip, please visit [USB to serial port chip CH340 - Nanjing Qinheng Microelectronics Co., Ltd.](https://www.wch.cn/products/CH340.html) to read the relevant methods and obtain the required computer software.

Note: The above external links are for reference only. I do not have the rights to the pages pointed to by the above links and the trademarks, articles, pictures or attachments therein. I am not responsible for the security of its website and the computer software and other contents provided.

## Updates and Fixes


| Version | Time | Description |
| --- | --- | --- |
| 2.00 | 2023-07-03 | |
| 2.01 | 2023-07-04 | An electrolytic capacitor was added next to the USB connector to provide better power performance. |

# Contact the author

* Contact list [GitHub personal homepage](https://github.com/SnowyIris)
* QQ exchange group [★Cyber ​​Archaeology Society★](https://jq.qq.com/?_wv=1027&k=62Df1llt) (732574927)
* Open source hardware release [LiChuang open source platform personal homepage](https://oshwhub.com/snowy_iris)
* Support and donation [Aidianfa personal homepage](https://afdian.net/a/Atranix)

Due to the characteristics of the platform, private messages and comments on the LiChuang open source platform may not be replied, or the reply interval may be very long. Please understand.

Looking for other development boards? Please refer to [**Miss Xing Yuandai's development board introduction**](https://oshwhub.com/article/ICMCU_board_series_guide)