ABSTRACT
This thesis is designed to get the instrumentation with high sensitivity.Generally, this thesis presents several noteworthy characteristics. First, Colpittsoscillator is used as measurement instrumentation for temperature and humiditywith frequency output varying which correlate with those parameters. Second,AT-Tiny2313-20PU is employed as frequency counter interfaced to a computerthrough an RS-232 port. Third, LabVIEW is employed as the softwaredevelopment environment to communicate from computer to external hardwarefor automatically uploading and processing data. The increasing sensitivity gottenis from (29,9exp-3,45E-2T) C/0C to (-9,73E4/T)Hz/0C and from (1,83E-9) F/%RH to(-48,3E2)Hz/%RH for temperature and humidity respectively.