This project is a card with 32 analogue inputs with 12-bit resolution each for external connection to the serial port. The feature par excellence of the present project is the way it communicates with the computer. Read on!Most commercially available cards for analogue voltage capturing include a microcontroller or a UART chip for the serial communication. The card described in this article does not have any of the above chips because its design is based on direct accessing of PC internal UART registers which arrange the conversion from serial to parallel.About the serial portSerial ports are mainly used for communication between computers or between computers and peripherals such as a modem or a mouse. The controller of the PC internal RS232 port is nearly always a UART (Universal Asynchronous Receiver Transmitter) chip fitted on the motherboard. The chip works as a serial-toparallel and parallel-to-serial adapter.