Power supply mode: +5V, connected to CN3 through USB square port cable. All functional pins are lead out, making it easy to use Dupont lines to connect peripheral modules. The signal pins of CN3 and CN4 are equipped with an ESD protection circuit. CN1: 2.54mm pitch 1x20 Pin single row pin; CN2: 2.54mm pitch 1x20 Pin single row pin; CN4: 2.54mm pitch 2x10 Pin double row bending needle simple horn holder. The distance between CN1 and CN2 is: 1400mil, that is, 14x2.54=35.56mm. [Relevant information] 1. Schematic diagram of the board . 2. For chip documentation and drivers, please go to the FTDI official website to download the updated version . 3. Documents such as "FT2232HL used as openOCD Concise Manual V0.1.pdf" [Simple steps to use] LED1 is the power-on indicator light. After power is supplied, it is always on. After installing its driver CDM21228_Setup, FT2232HL defaults to USB to dual serial port. These two serial ports can be easily tested using the PC serial port debugging software. Just use two Dupont wires to cross-connect the serial port: ADBUS0 (TXD) to BDBUS1 (RXD) ADBUS1 (RXD) to BDBUS0 (TXD) U7 (74HC573) is connected to BDBUS and is used to drive LEDs for signaling. When the board is powered on, some LEDs will flash, which is normal. When BDBUS is used as a serial port and turned on, the red light in LED5 is always on, which is an indication of hardware flow control and is a normal phenomenon. Colour:Green Material:ABS Package Contents: 1 x FT2232HL board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.