2Pcs FTDI FT232RL Mini USB to TTL Serial Converter Adapter Module 3.3V 5.5V FT232R Breakout FT232RL USB to Serial Mini USB to TTL Adapter Board for Arduino【FT232R introduction】With the development of computer technology, the parallel port and serial port have gradually disappeared on the PC, and now even the desktop computer has few parallel ports. But for engineers, both the parallel port and the serial port are essential interfaces, especially the serial port. For a computer without a serial port, the most convenient solution is to use a USB to serial port chip to virtualize a serial port. Many manufacturers have produced such chips, such as Silicon LABS's CP210x series, TI's TUSB3410, Nanjing Qinheng's CH34x series, FTDI's FT232 series, Prolific's PL230x series, Aiko's ARK3116, etc. From the perspective of stability, the FT232 series is the most reliable. You can use it to debug programs without worrying about the blue screen. The FT232R chip is a single-chip solution. Generally, no peripherals are required. Even the crystal oscillator, USB matching resistor, and EEPROM for placing product information have been integrated inside. FT232R also has some more useful functions. For details, please refer to the FT232R data sheet.【Package Included】2Pcs FTDI FT232RL Mini USB to TTL Serial Converter Adapter Module10 pin Female to Female Breadboard Jumper Wires10 pin Male to Female Breadboard Jumper Wires