1. Úvod
The KEYESTUDIO V4.0 Development Board is a microcontroller board fully compatible with Arduino UNO R3. It is designed for ease of use in electronics prototyping and STEM education. This board features an updated CP2102 USB serial chip for reliable connectivity and includes a USB cable for immediate use. Its distinctive yellow-black design with clear silk-screened pin labels enhances readability and user experience.

Obrázek 1: Nahoře view of the KEYESTUDIO V4.0 Development Board.
2. Vlastnosti produktu
- Mikrokontrolér: ATmega328P-PU.
- USB Serial Chip: CP2102, ensuring full compatibility with Arduino.
- Digitální I/O piny: 14 (6 of which can be used as PWM outputs).
- Analogové vstupy: 6.
- Rychlost hodin: 16 MHz quartz crystal.
- Paměť: 32 KB Flash Memory (0.5 KB used by bootloader).
- Konektivita: USB connection and a power jack for external power.
- Další vlastnosti: ICSP headers and a reset button.
- Design: Yellow-black PCB with clear, easy-to-read pin labels.

Obrázek 2: Detailní view of board components.
3. Pokyny k nastavení
- Instalace ovladače: If using Windows, you may need to install the CP210X USB to UART bridge VCP driver from Silicon Labs. Search online for "CP210X USB to UART bridge VCP driver" to find the official download.
- Připojení k počítači: Use the provided USB cable to connect the KEYESTUDIO V4.0 Development Board to your computer. The board can be powered via this USB connection.
- Instalace vývojového prostředí Arduino: Download and install the official Arduino Integrated Development Environment (IDE) from the Arduino webweb (www.arduino.cc/en/software).
- Vyberte desku a port: Otevřete vývojové prostředí Arduino. Přejděte na Nástroje > Deska and select "Arduino Uno". Then, go to Nástroje > Port and select the serial port corresponding to your connected board (it will typically show "Arduino Uno" or the CP2102 chip).
- Externí napájení (volitelné): For projects requiring more power or standalone operation, connect an AC to DC adapter (7-12V) to the power jack on the board.

Figure 3: USB and DC power connections.
4. Návod k obsluze
- Load an Exampnáčrt: V Arduino IDE přejděte na File > Přamples > 01.Základy > Blink to open the classic LED blink sketch.
- Ověřovací kód: Click the "Verify" button (checkmark icon) in the Arduino IDE to compile the code and check for errors.
- Nahrát kód: Click the "Upload" button (right arrow icon) to upload the compiled sketch to your KEYESTUDIO V4.0 Development Board. The RX and TX LEDs on the board will blink during the upload process.
- Pozorujte provoz: Once uploaded, the onboard LED (connected to digital pin 13) should begin to blink, indicating successful operation.
- Experiment with Projects: The board can be used with various sensors, actuators, and shields. Refer to Arduino tutorials and project guides for detailed instructions on specific applications.

Figure 4: Board connected to a breadboard for a project.
Video 1: Official KEYESTUDIO video demonstrating the V4.0 Development Board and its features.
5. Údržba
- Skladování: Store the board in an anti-static bag when not in use to prevent damage from electrostatic discharge.
- Čištění: K čištění desky používejte měkký, suchý hadřík. Nepoužívejte tekutiny ani abrazivní čisticí prostředky.
- Zacházení: Handle the board by its edges to minimize contact with components and prevent static discharge.
- Napájení: Vždy dbejte na správný objemtage (7-12V for external power) is applied to avoid damaging the board.
6. Řešení problémů
- Deska nebyla detekována:
- Ensure the CP210X USB to UART bridge VCP driver is correctly installed (refer to Setup Instructions).
- Zkuste jiný USB port nebo USB kabel.
- Restart your computer and the Arduino IDE.
- Chyby při nahrávání:
- Verify that the correct board type ("Arduino Uno") and serial port are selected in the Arduino IDE.
- Check all wiring for loose connections or short circuits.
- Ujistěte se, že žádné jiné programy nepoužívají sériový port.
- Žádné napájení/LED diody nesvítí:
- Check USB cable connection or external power supply.
- Ujistěte se, že zdroj napájení poskytuje správnou hlasitosttage.
7. Specifikace
| Značka | KEYESTUDIO |
| Název modelu | KEYESTUDIO V4.0 Development Board |
| Mikrokontrolér | ATmega328P-PU |
| Flash paměť | 32 KB (0.5 KB využívá bootloader) |
| SRAM | 2 kB |
| EEPROM | 1 kB |
| Rychlost hodin | 16 MHz |
| Digitální I / O kolíky | 14 (6 PWM outputs) |
| Analogové vstupní kolíky | 6 |
| Provozní svtage | 5V |
| Vstupní objemtage (doporučeno) | 7-12V |
| USB Serial Chip | CP2102 |
| Rozměry | 100 x 62 x 23 mm |
| Hmotnost | 0.07 kg (70 g) |

Figure 5: Board dimensions and weight.
8. Záruka a podpora
For warranty information and technical support, please refer to the official KEYESTUDIO webnebo se obraťte přímo na jejich zákaznický servis. Uschovejte si doklad o koupi pro případné reklamace.