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FUSBX1 FT232BM based TTL to RS232 via USB port

Virtual com driver and other files and documentation for the FT232BM chip can be downloaded from the FTDI website


 Tx,Rx,CTS,RTS,DSR,DTR,CD,RI TTL lines for connecting to a microcontroller or any device that requires serial I/O via an RS232 TTL connection. RX and TX leds show activity. Can provide power (500ma max) for additional circuitry if required.

USBX1 shown assembled sold as a kit (requires soldering)

 Documentation is available here.

The USBP provides an easy method of connecting TTL to RS232 signals on PC via a USB port. Ideal for microcontroller circuits. The design uses Future Technology Devices Intl Ltd's (FTDI) FT232BM chip. The FTDI website provides the USB drivers for a virtual com port as well as Windows DLLs for interfacing with Visual Basic and Visual C, plus other applications. FT232BM documentation and files are available from the FTDI  website                                            

USBX1 kit $16.95

Ordering page

About the kit and assembly notes

The kit incorporates numerous surface mount parts (SMD), resistors, caps and the SOIC eeprom. Assembly of this kit requires that the user has the necessary tools and skills to work with SMD (surface mount device) components. If one is not comfortable with  soldering miniature parts, then it is advisable to seek assistance from someone who is capable to do so. Small mistakes can cause many frustrating hours of grief in trouble shooting! Minimum tools required: A  fine point low power (25w max) soldering iron and thin solder. Ideally, 0.022" diameter (or less) silver-bearing non-corrosive rosin core should be used. In addition. narrow needle nose pliers, diagonal cutting  pliers, good quality tweezers, large magnifying glass, volt-ohm meter, and a 7 to 12 vdc power supply. Make sure that you work in a clean well lighted area and have adequate desk area. If you have carpeting then  please be aware of static discharge as well as accidentally losing tiny components in the carpets fiber. SMD capacitors and resistors are very tiny and can quickly become invisible in the carpeting.

FTDI 232R Board


UFT323R USB to TTL RS232 kit shown assembled

USBR1 kit $19.00

 (requires soldering)


The UFT232R A USB to TTL RS232 kit. it is based on the new FT232R chip by FTDI. The new chip reduces the components required and yet provides all of the extended functionality. The RS232 TTL I/O lines are rated at 3.3v but are 5v tolerant. The board can provide 3.3v or 5v power (100ma max) for connected devices. The board has LEDs for the power, Tx and Rx lines. It has a standard USB Type B connector. Model USBRA1 has a Type A connector. It plugs directly into a PC’s USB port

Provided as a kit and requires soldering components. FTDI chip information and drivers are available at http;//

Kit documentation


USBRA1 kit $19.00

Similar to the USBR1 kit except that this model has a USB Type A connector. It plugs directly into a PC’s USB port, no USB cable is required.

Kit documentation

 (requires soldering)


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Updated on:

February 16, 2018 

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