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Low cost data acquisition and data processing system

The development of a low cost ($4000) data system configured around a micro-computer is described. The system has wide application in meeting on-site data acquistion and analysis needs for even low budget projects. The heart of the system uses a Z-80 microprocessor with 32K of RAM memory available for data monitoring and analysis. Mass storage is provided on a single-drive double density disc system (180K bytes), and a 64-channel software programmable, analog-to-digital signal converter (A/D) provides communication to the real world sensors (temperature, solar insolation, on/off, etc.). Communications to the CPU takes place via the full ASCII keyboard and 16 x 64 character CRT video display. This system is now currently being used in the Michels' Residence, a passive solar retrofit demonstration project, as the primary data acquistion and analysis system.