You can use FT2232HL to convert from USB to multiple interfaces, such as UART/SPI/JTA/I2C, etc. Overall dimensions (length x width x height): 103 x 45 x 14 mm PCB size (length x width x thickness): 95 x 45 x 1.6mm Power supply: +5V, which is connected to CN3 through USB square cable. All functional pins are drawn out, making it easy to use dupont wire to connect peripheral modules. The signal pins of CN3 and CN4 are added with ESD protection circuit. CN1: 2.54mm spacing 1 x 20 Pin single row needle; CN2: 2.54mm spacing 1 x 20 Pin single row needle; CN4: 2.54mm spacing 2 x 10 Pin double row needle simple Angle holder. The spacing between CN1 and CN2 is 1400mil, that is, 14x2.54=35.56mm. [simple usage steps] LED1 is the power on indicator light. After the power is supplied, it stays on. After installing its drive CDM21228_Setup, FT2232HL defaults to USB to dual serial ports. Using PC serial debugging software can easily test these two serial ports. Just use two dupont wires to cross connect the serial ports: ADBUS0 (TXD) and BDBUS1 (RXD) ADBUS1 (RXD) and BDBUS0 (TXD) U7 (74HC573) is connected to BDBUS for driving LED for signal indication. Some LED flashes are normal when the board is charged. When BDBUS is used as a serial port and opened, the red light in LED5 is always on, which is the indicator of hardware flow control, which is a normal phenomenon. The board 93LC56 EEPROM is not in use, so it is indicated as BLANK DEVICE. Color:Black Material:Plastic+Metal Package Contents: 1 * Development board 1 * DuPont cable 1 * Data cable