A low cost data logger

Abstract

The aim of the project ls to build a low cost data logger, a device for collecting data over a period of time with chosen intervals. Though various data logging systems can be obtained from the manufacturers, their prices and power consumption are high. Here an attempt ls made to design and construct a low cost type. Complementary - Metal - Oxide - Semiconductor (CMOS) integrated circuit logic is employed, chiefly because of its low power consumption requirements and the availability in the consumer market.The system produced can sample eight different channels each carrying an analog signal. This is made possible by an addressable multiplexer. This signBl is then converted to digital form by an Analog digital converter . The binary' coded decimal output is stored In a CMOS RAM memory, servipg as a temporary storage of data collected. During sampling, time lS provided by a clock chip irrcorporated and kept running throughout the data collecting period.