RZUJBN_AAA
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The products created by GroundStudio are made using high-quality components, designed and assembled in Romania.
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![]() Pinout | ![]() Schematic and Layout |
The GroundStudio Jade U1 development board is an improved version of the classic U1 board, equipped with a USB Type-C adapter (upgraded from USB Type-B). It uses the HT42B534-2 chip for USB 2.0 to Serial (UART) conversion, an I2C_3V3 adapter for quick connection via I2C to compatible devices without needing a 5V to 3V3 logic level converter, and an ON-OFF switch to disconnect power without unplugging the USB or power cable.
Thanks to the HT42B534-2 chip, the development board can also emulate other devices (e.g., a keyboard) using the program and documentation available at the following link: https://www.holtek.com/productdetail/-/vg/HT42B534-2
The Jade U1 development board is compatible with sensors and other modules that operate at 5V. It can also be used with modules that operate at 3V3 only through the I²C 3V3 adapter.
For serial communication (UART) with devices at 3.3V logic level, a separate logic level converter module is required.
The position of the RESET button has been improved, being placed on the side, making it accessible even when used with a shield.
The board also integrates a I²C 3V3 connector compatible with STEMMA QT or Qwiic connectors for easier interconnectivity with a wide range of sensors and modules.
The board also features pins for specialized functions:
Microcontroller: ATmega328p with UNO bootloader
USB-Serial Converter: HT42B534-2
Voltage regulator: AMS1117-5V and AMS1117-3.3V
Power supply voltage [Vin]: 7V - 12V
Digital I/O pins: 16 (6 PWM output pins (~3, ~5, ~6, ~9, ~10, ~11))
Analog input pins: 4
USB 2.0 Type-C adapter
I2C_3V3 adapter (SH type with 1mm pitch)
Max DC current per I/O pin: 20 mA
Max current 5V/3V3: 500mA
FLASH memory: 32 kB
EEPROM memory: 1 kB
SRAM memory: 2 kB
Frequency: 16MHz
Approx. PCB dimensions: 68.6mm x 53.4mm
* Compatible with R3 shields (Pins A4 and A5 are directly connected to the I²C 3V3 logic converter, being implicitly pullup, which may cause incompatibility with certain shields.)
* No additional driver installation required on any up-to-date operating system (unlike other modules on the market (CH340, FTDI, etc.)).
* For Windows 7, 8, or 8.1, find the driver in the Downloads section.
* Pins A4 and A5 are directly connected to the I²C 3V3 logic converter, being implicitly pullup, which may cause incompatibility with certain shields.
For this example, you need the following:
1x Jade U1 development board || Reference RZUJBN_AAA
Before connecting the board, start by downloading Arduino IDE 1.8.x from the link above according to your preferences and the operating system used.
After the initial connection via a USB-C cable, your computer will attempt to find a compatible driver. In this case, it will connect directly to Windows using the HT42B534-2 chip, as the drivers for this will install automatically.
To select the board, go to the "Tools" menu, then click on the board button, ensuring that Arduino Uno is selected.
Next, you need to tell the Arduino IDE which of your computer's serial ports is connected to the Jade U1. To do this, go back to "Tools", then hover over Serial Port and select the COM port of the Jade U1.
If you have multiple ports and are unsure which port is the Jade U1, disconnect it for a moment and check the menu to see which one disappears.
After selecting the COM port and the board, you can upload the Blink code from the menu File -> Examples -> 01.Basics -> Blink.
1x GroundStudio Jade U1 development board
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