About the article

32-Channel Analogue Input Card

for the serial (RS232) port

32-Channel Analogue Input Card
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

C1,C2,C3,C10 = 4µ F7 16V radial
C4,C6-C9 = 100nF
C5 = 330nF
C11-C15 = 1µ F 16V radial
D1 = 1N4001
IC1-IC4 = MAX186-CPP
IC6 = 7805
K1 = 9-way sub-D socket (female), angled pins, PCB mount
K2,K3 = 34-way boxheader
PCB, order code 004090-1
Project software: free download from Publishers' or author's website.
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