KS0172A Keyestudio (Black) Main Control Board

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Keyestudio Main Board With Pin Header Interface


keyestudio main board with pin headers has the same basic functions as [1]. It is a microcontroller board based on the ATMEGA328P-AU, which has the same function as ATMEGA328P(-PU), fully compatible with ARDUINO UNO.
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, 2 ICSP headers, and a reset button.
It breaks out all the digital and analog pins in the form of 3PIN headers (G, V, S).
S pins correspond to all 14 digital pins, 6 analog pins. G pins for ground. V pins for VCC. You can control the voltage of VCC via a slide switch for 5V or 3.3V.
When switched to 5V, level on serial communication port is 5V, voltage of pins is 5V. When switched to 3.3V, level on serial communication port is 3.3V, voltage of pins is 3.3V.
It also breaks out two 4PIN headers for serial communication and IIC communication. So it is more easier to connect external sensors and modules.
As for keyestudio main board, its voltage-regulator chip is NSP1117. When connect external power, output 5V, drive current is 1A.
But for this keyestudio main board with headers, its voltage-regulator chip is MP2307DN. When connect external power, output 5V, drive current is 2A.
It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

Tech Specs

Microcontroller ATmega328P-AU
Operating Voltage 5V
Input Voltage (recommended) DC 7-12V
Digital I/O Pins 14 (D0-D13)
PWM Digital I/O Pins 6 (D3, D5, D6, D9, D10, D11)
Analog Input Pins 6 (A0-A5)
DC Current per I/O Pin 20 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328) of which 0.5 KB used by bootloader
Clock Speed 16 MHz



Element and Pin Interfaces

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

KS0001 5-1.png ICSP (In-Circuit Serial Programming) Header

ICSP is the AVR, an Arduino 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 the output. In fact, slave the output devices under the SPI bus host.
When connecting to PC, program the firmware to ATMEGA328P-AU.

KS0001 5-2.png Serial Communication Pin

Connect to serial communication. 4Pins (GND, VCC (3.3V or 5V controlled by slide switch), RX, TX)

KS0001 5-3.png Ground

Ground pins

KS0001 5-4.png V Pins (VCC)

Power the external sensors and modules. Select the voltage of 3.3V or 5V via a slide switch.

KS0001 5-5.png Digital I/O

It has 14 digital input/output pins, labeled D0 to 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. The pin D3, D5, D6, D9, D10, and D11 can be used to generate PWM.
For digital port, you can connect through female headers, or through pin headers (labeled S) of 2.54mm pitch.

KS0001 5-6.png AREF

For Analog reference. Sometimes used to set an external reference voltage (0-5V) as the upper limit of analog input pins.

KS0001 5-7.png SDA

IIC communication pin

KS0001 5-8.png SCL

IIC communication pin

KS0001 5-9.png ICSP (In-Circuit Serial Programming) Header

ICSP is an AVR, an Arduino micro-program header consisting of MOSI, MISO, SCK, RESET, VCC, and GND. Connected to ATMEGA 16U2-MU. When connecting to PC, program the firmware to ATMEGA 16U2-MU.

KS0001 5-10.png Microcontroller

Each control 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 of IC.
The microcontroller used in this board is ATMEGA328P-AU.

KS0001 5-11.png D13 LED

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.

KS0001 5-12.png TX LED

Onboard you can find the label: TX (transmit)
When Arduino board communicates via serial port, send the message, TX led flashes.

KS0001 5-13.png RX LED

Onboard you can find the label: RX(receive )
When main board communicates via serial port, receive the message, RX led flashes.

KS0001 5-14.png Power LED

LED on means that your circuit board is correctly powered on. Otherwise LED is off.

KS0001 5-15.png USB Connection

You can power the board via USB connection. Or can upload the program to the board via USB port.
Connect the board to PC using a USB cable via USB port.

KS0001 5-16.png ATMEGA 16U2-MU

USB to serial chip, can convert the USB signal into serial port signal.

KS0001 5-17.png Slide Switch

You can slide the switch to control the voltage of pin V (VCC), 3.3V or 5V.

KS0001 5-18.png Voltage Regulator

To control the voltage provided to the main board, as well as to stabilize the DC voltage used by the processor and other components.
Convert an external input DC7-12V voltage into DC 5V, then switch DC 5V to the processor and other components, output DC 5V, drive current is 2A

KS0001 5-19.png DC Power Jack

The board can be supplied with an external power DC7-12V from the DC power jack.

KS0001 5-20.png IOREF

Used to configure the operating voltage of microcontrollers. Use it less.

KS0001 5-21.png RESET Header

Connect an external button to reset the board. The function is the same as reset button

KS0001 5-22.png Pin 3V3 Output

Provides 3.3V voltage output

KS0001 5-23.png Pin 5V Output

Provides 5V voltage output

KS0001 5-24.png Vin

You can supply an external voltage input DC7-12V through this pin to the board.

KS0001 5-25.png Analog Pins

The main board has 6 analog inputs, labeled A0 through A5.
Can also used as digital pins, A0=D14, A1=D15, A2=D16, A3=D17, A4=D18, A5=D19.
For analog port, you can connect through female headers, or through pin headers (labeled S) of 2.54mm pitch.

KS0001 5-26.png IIC Communication Pin

Connect to the IIC communication.
4Pins (GND, VCC (3.3V or 5V controlled by slide switch), SDA, SCL)

KS0001 5-27.png RESET Button

You can reset your board to start the program from the initial status.


Specialized Functions of Some Pins

  • Serial communication: Digital pins 0 (RX) and 1 (TX).
  • PWM Interfaces (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.
  • SPI communication: D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK). These pins support SPI communication using the SPI library.
  • IIC communication: A4 (SDA); A5(SCL)

Resources Download

  • You can download the datasheet from the link:


  • Software Download:


  • You might also want to look at:

the reference for the Arduino language;

Detailed Test with ARDUINO Software as follows:

Step1 | Download the Arduino environment (IDE)

When you get the main 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. 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.

Installing Driver

Next, we will introduce the driver installation of main board. The driver installation may have slight differences in different computer systems. So in the following let’s move on to the driver installation in the WIN 7 system.
The Arduino folder contains both the Arduino program itself and the drivers that allow the Arduino to be connected to your computer by a USB cable. Before we launch the Arduino software, you are going to install the USB drivers.


Plug one end of your USB cable into the Arduino and the other into a USB socket on your computer. When you connect main control board to your computer at the first time, right click the icon of your “Computer” —>for “Properties”—> click the “Device manager”, under “Other Devices”, you should see an icon for “Unknown device” with a little yellow warning triangle next to it. This is your Arduino.

Driver 1.png
Then right-click on the device and select the top menu option (Update Driver Software...) shown as the figure below..
Driver 2.png

It will then be prompted to either “Search Automatically for updated driversoftware” or “Browse my computer for driver software”. Shown as below. In this page, select “Browse my computer for driver software”.
Driver 3.png

After that, select the option to browseand navigate to the “drivers” folder of Arduino installation.
Driver 4.png

Click “Next” and you may get a security warning, if so, allow the software to be installed. Shown as below.
Driver 5.png

Once the software has been installed, you will get a confirmation message. Installation completed, click “Close”.
Driver 6.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.
Driver 7.png

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| Connect the board

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

Step3| Select the Arduino Board

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

Step4| Select the Serial Port

Select the serial device of the Arduino board from the Tools | Serial Port menu. This is likely to be COM3 or higher (COM1and COM2 are usually reserved for hardware serial ports). To find out, you can disconnect your Arduino board and re-open the menu; the entry that disappears should be the Arduino board. Reconnect the board and select that serial port.

Note: to avoid errors, the COM Port should keep the same as the Ports shown on Device Manager.


Step5| Upload the Program

Below is an example program 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!");

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.

Step6| Open the Serial Monitor

After that, click the serial monitor button to open the serial monitor.
UNO monitor.png
Then set the baud rate as 9600, enter an “R” and click Send, you should see the RX led on the board blink once, and then D13 led blink once, finally "Hello World!" is showed on the monitor, the TX led blink once. Congrats!
Ks0248 monitor 2.png

For Extension

You can connect a temperature and humidity sensor, a LCD display to this board to make the experiment.

Package List

  • keyestudio main control with Pin Header Interface * 1pcs
  • USB cable * 1pcs



If you have problems, please see the troubleshooting suggestions.

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