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SH301.C A/D sampling routine SH302.C Singlechip 89C2051-based sampling procedures SH303.C voltage current detection procedures SCM 304 instrumentation amplifier chips used procedures do not provide. SH305.C DS1820 temperature measurement procedures SH306.C HMR3000 digital compass readings procedures SH307.C GPS readings procedures need to add liquid crystal display part of the process