Ks0173 keyestudio Nano ch340

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Keyestudio Nano ch340


keyestudio Nano CH340 is a small, complete, and breadboard-friendly board based on the ATmega328P-AU. Compared with ARDUINO NANO, the USB-to-serial port chip used in keyestudio Nano is CH340G, so that the using method is the same except the driver installation file.
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, a 16 MHz crystal oscillator, a mini USB port, an ICSP header and a reset button.
Note that ICSP (In-Circuit Serial Programming) header is used to program the firmware to ATMEGA328P-AU, but generally the chip has been preburned before leave the factory. So use it less.
The keyestudio Nano can be powered via the Mini-B USB connection, or female headers Vin/GND (DC 7-12V).


Microcontroller ATmega328P-AU
Operating Voltage 5V
Input Voltage (recommended) DC7-12V
Digital I/O Pins 14 (D0-D13) (of which 6 provide PWM output)
PWM Digital I/O Pins 6 (D3, D5, D6, D9, D10, D11)
Analog Input Pins 8 (A0-A7)
DC Current per I/O Pin 40 mA
Flash Memory 32 KB of which 2 KB used by bootloader
Clock Speed 16 MHz


  • PCB Dimensions: 18mm x 45mm
  • Weight: 7g

Ks0173 size.jpg

Element and Interfaces

Here is an explanation of what every element and interface of the board does:
Ks0173 pinout.jpg

1 ICSP Header ICSP (In-Circuit Serial Programming) Header

ICSP is the AVR, an micro-program header consisting of MOSI, MISO, SCK, RESET, VCC, and GND. It is often called the SPI (serial peripheral interface) and can be considered an "extension" of output. In fact, slave the output devices under the SPI bus host.
When connecting to PC, program the firmware to ATMEGA328P-AU.

2 LED indicator(RX) Onboard you can find the label: RX(receive )

When control board communicates via serial port, receive the message, RX led flashes.

3 LED indicator(TX) Onboard you can find the label: TX (transmit)

When control board communicates via serial port, send the message, TX led flashes.

4 LED indicator(POW) Power up the control board, LED on, otherwise LED off.
5 LED indicator(L) There is a built-in LED driven by digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
6 RX0(D0)TX1(D1)D2-D13
It has 14 digital input/output pins D0-D13 (of which 6 can be used as PWM outputs). These pins can be configured as digital input pin to read the logic value (0 or 1). Or used as digital output pin to drive different modules like LED, relay, etc.
7 RST Reset pin: connect external button. The function is the same as RESET button.
8 MEGA 328P Each board has its own microcontroller. You can regard it as the brain of your board.

Microcontrollers are usually from ATMEL. Before you load a new program on the Arduino IDE, you must know what IC is on your board. This information can be checked at the top surface of IC.
The board’s microcontroller is ATMEGA328P-AU.
More info. see the datasheet

9 MINI USB The board can be powered via Mini-B USB connection. Also upload the program to the board via USB port.
10 3V3 pin rovides 3.3V voltage output
11 REF Reference external voltage (0-5 volts) for the analog input pins. Used with analogReference().
12 A0-A7 The Nano has 8 Analog Pins, labeled A0 through A7.
13 5V pin Provides 5V voltage output
14 GND Ground pin
15 VIN Input an external voltage DC7-12V to power the board.
16 Reset Button Used to reset the control board
17 CH340G USB-to-serial port chip, converting the USB signal into Serial port signal.
18 AMS1117 Convert the external voltage input DC7-12V into DC5V, then transfer it to the processor and other elements.

Nano Back View


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)


  • Automatic (Software) Reset:

Rather then requiring a physical press of the reset button before an upload, the Arduino Nano is designed in a way that allows it to be reset by software running on a connected computer.

Detailed Use with ARDUINO Software as follows

Step1| Download the Arduino IDE

When you get the board, first you should install the Arduino software and driver.
We usually use the Windows software Arduino 1.5.6 version. You can download it from the link below:
Or you can browse the ARDUINO website to download the latest version from this link, https://www.arduino.cc, pop up the following interface.

Then click the SOFTWARE on the browse bar, you will have two options ONLINE TOOLS and DOWNLOADS.

Click DOWNLOADS, it will appear the latest software version of ARDUINO 1.8.5 shown as below.

In this software page, on the right side you can see the version of development software for different operating systems. ARDUINO has a powerful compatibility. You should download the software that is compatible with the operating system of your computer.
We will take WINDOWS system as an example here. There are also two options under Windows system, one is installed version, the other is non-installed version. For simple installed version, first click Windows Installer, you will get the following page.



This way you just need to click JUST DOWNLOAD, then click the downloaded file to install it.
For non-installed version, first click Windows ZIP file, you will also get the pop-up interface as the above figure.
Click JUST DOWNLOAD, and when the ZIP file is downloaded well to your computer, you can directly unzip the file and click the icon of ARDUINO software to start it.

Installing Arduino (Windows)

Install Arduino with the exe. Installation package downloaded well.

Click“I Agree”to see the following interface.

Click “Next”. Pop up the interface below.

You can press Browse… to choose an installation path or directly type in the directory you want.
Then click “Install” to initiate installation.

Wait for the installing process, if appear the interface of Window Security, just continue to click Install to finish the installation.

Introduction for Arduino IDE Toolbar

Double-click the icon of Arduino software downloaded well, you will get the interface shown below.
(Note: if the Arduino software loads in the wrong language, you can change it in the preferences dialog. See the environment page for details.)

The functions of each button on the Toolbar are listed below:

IDE 1.png Verify/Compile Check the code for errors
IDE 2.png Upload Upload the current Sketch to the Arduino
IDE 3.png New Create a new blank Sketch
IDE 4.png Open Show a list of Sketches
IDE 5.png Save Save the current Sketch
IDE 6.png Serial Monitor Display the serial data being sent from the Arduino

Step2| Installing the Driver

The USB to serial port chip of this control board is CH340G. So you need to install the driver for the chip. You can click the driver file here usb_ch341_3.1.2009.06 to download it.
In different systems, the driver installation is similar. Here we start to install the driver on the Win7 system.
Plug one end of your USB cable into the Keyestudio NANO ch340 board and the other into a USB socket on your computer.
When you connect the NANO ch340 board to your computer at the first time, right click your “Computer” —>for “Properties”—> click the “Device manager”, under Other devices, you should see the “USB2.0-Serial”.
Ks0354 driver 1.png

Then right-click on the device and select the top menu option (Update Driver Software...) shown as the figure below.
Ks0354 driver 2.png

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”.
Ks0354 driver 3.png

After that, select the option to browseand navigate to the “drivers” folder of usb-ch341 installation.
Ks0354 driver 4.png

Once the software has been installed, you will get a confirmation message. Installation completed, click “Close”.
Ks0354 driver 5.png

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.
Ks0354 driver 6.png

Step3| Connect the board

Connect the NANO board to your computer using the USB cable. The power LED should go on.

Step4| Select the Arduino Board

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

Ks0173- board.png

Step5| 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.

Ks0173- port.png

Step6| Upload the Code

Below is an example code for displaying the Hello World!
Copy and paste the code to the Arduino environment IDE.

int val; 
int ledpin=13; 
void setup()
void loop()
Serial.println("Hello World!");

Ks0173- code.png

Then click verify button to check the errors. If compiling successfully, the message "Done compiling." will appear in the status bar.
Ks0173 图片1-compile.png

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.
Ks0173 图片1-upload.png

Step7| Open the Serial Monitor

After that, click the button to open the serial monitor.
Ks0173- monitor 1.png

Then 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.
Ks0173- monitor 2.png

Package Included

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


Resource Links

You can download the datasheet from the link:

Download the CH340 Driver File:

You might also want to look at:
the reference for the Arduino language;

Download ARDUINO Software:


If you have problems, please see the troubleshooting suggestions.

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