Keyestudio Nano V3.0 Development Board with 328P Microcontroller CH340 Chip

Introduction

The processor core of Keyestudio Nano CH340 is atmega328p-au. It is as same as the official Arduino Nano in addition to driver file and USB to serial chip (CH340G). It also has a 14 digital input / output interfaces (6 of which can be used as PWM output), 8 analog input interfaces, 1 16MHz crystal oscillator, 1 mini USB port, 1 ICSP interface, and a reset button.
The ICSP interface is used to burn firmware to Atmega328P-Au. Since this chip we burn firmly in front of the factory, it is generally not available. When using the Mini USB cable, we can use the VIN GND (DC 7-12V) to power.
What’s more, you can burn the firmware for Atmega328P-Au through the built-in ICSP port. The firmware of this chip is burnt well before delivery, therefore, you don’t need to burn the firmware.
The power can be supplied through USB cable, port 5V , GND（DC 5V), as well as Vin GND (DC 7-12V).
 

Specification

Element and Interfaces

Here is an explanation of what every element and interface of the board does:



 

Specialized Functions of Some Pins

• Serial communication: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data.
• PWM (Pulse-Width Modulation): D3, D5, D6, D9, D10, D11
• External Interrupts: D2 (interrupt 0) and D3 (interrupt 1). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.
• SPI communication: D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK).
• IIC communication: A4 (SDA); A5(SCL)

Windows System

Download the Arduino IDE

When getting this control board, we need to install Arduino IDE.
 

Enter the website https://www.arduino.cc/，click and

Select versions you want to download, the latest version could be downloaded.

Alternatively, you could select previous release.
In this project, we use 1.8.12 version.

Click to view the below page

 

Click to download an installer of Arduino 1.8.12 version，which needs to be installed manually. When you tap a zip file of Arduino 1.8.12 version will be directly downloaded, and you only need to unzip it to finish installation.

Click iconto download Arduino IDE.
 

Download Driver of CH340

https://fs.keyestudio.com/CH340-WIN

Installing the Driver

The driver will be installed after downloading Arduino IDE.

If your system is Windows 10, the computer will automatically install driver.
For other systems, like Windows7, we need to install driver manually.
The USB to serial chip of control board is CH340G, therefore, we will install the driver(usb_ch341_3.1.2009.06) for it.
Connect control board to computer with USB cable.
Click Computer----- Properties----- Device Manager, as shown below:
 

Then right-click on the device and select the top menu option (Update Driver Software...) shown as the figure below.

 

Then it will be prompted to either “Search Automatically forupdated driversoftware” or “Browse my computer for driver software”. Shown as below. In this page, select “Browse my computer for driver software”.

 

After that, select the option to browseand navigate to the “drivers” folder of usb-ch341 installation.

 

Once the software has been installed, you will get a confirmation message. Installation completed, click “Close”.

 

Up to now, the driver is installed well. Then you can right click “Computer” —>“Properties”—>“Device manager”, you should see the device as the figure shown below.

 

Select the Arduino Board

Click icon to pen Arduino IDE.

Open the Arduino IDE, you’ll need to click the “Tools”, then select the Board that corresponds to your Arduino.

When downloading the sketch to the board, you must select the correct name of Arduino board that matches the board connected to your computer. As shown below;

Then select the correct COM port (you can see the corresponding COM port after the driver is successfully installed).

• A- Used to verify whether there is any compiling mistakes or not.
• B- Used to upload the sketch to your Arduino board.
• C- Used to create shortcut window of a new sketch.
• D- Used to directly open an example sketch.
• E- Used to save the sketch.
• F- Used to send the serial data received from board to the serial monitor.

Setting IDE for new bootloader

Arduino Nano board could burn new and old bootloader. New bootloader is only compatible with 1.8.9 IDE and above. Yet the old one is compatible with all versions.

Select your serial port

Select the serial device of the Arduino board from the Tools | Serial Port menu.
Note: to avoid errors, the COM Port should keep the same as the Ports shown on Device Manager.



 

Hello World!

Copy the following code in the Arduino IDE.

int val; 
int ledpin=13; 
void setup()
{
Serial.begin(9600); 
pinMode(ledpin,OUTPUT);
}
void loop()
{
val=Serial.read();
if(val=='R')
{
digitalWrite(ledpin,HIGH);
delay(500);
digitalWrite(ledpin,LOW);
delay(500);
Serial.println("Hello World!");
}
}

Then click verify button to check the errors. If compiling successfully, the message "Done compiling." will appear in the status bar.




After that, click the “Upload” button to upload the code. If the upload is successful, the message "Done uploading." will appear in the status bar.



 

Then click to open serial monitor and set the baud rate to 9600, enter an “R” and click Send, that is, the computer will send the character R. When NANO board receives it, you should see the RX led on the board flash once, and then D13 led flash once; when keyestudio NANO board sends "Hello World!" to the computer, finally you should see the "Hello World!" is showed on the monitor, and TX led on the board flash once.

MAC System

Install Arduino IDE on MAC System

The installation instruction is as same as the chapter 5.1, as shown below:

Download the Driver of CH340

https://fs.keyestudio.com/CH340-MAC

How to Install teh Driver of CH340

Please refer to the following link: https://wiki.keyestudio.com/Download_CH340_Driver_on_MAC_System

Setting Arduino IDE

The setting method is as same as the chapter 5.6 except from COM port, as shown below:

Package Included

• Keyestudio NANO ch340 * 1pcs
• 30cm mini USB cable * 1pcs