An “intelligent” RS232 analogue-to-digital converter

A design for a low speed simple-to-build analogue-to-digital converter peripheral circuit is described. Portability between as many different main computers as possible is achieved by using a serial communication port. An 8748 single-chip microcomputer chip is used to give versatility and hardware independence to the design while at the same time retaining a simple circuit. Two analogue inputs are provided, digitized to a resolution of 12 bits, while a real-time clock is included on the basis that expired time is very frequently needed in data-logging work.