The purpose of this research is to study the design and usability test instrumentation and save energy values, portable and can compare the value of measuring the design with the measuring instruments. Mini data logger testo version 174H in experiment recorder portable power values results of the study as follows: the effects of experiment showed that the design of recorder and measurement of energy values can work according to วัตถุประสงค์ที่ placed. The measuring value% the deviate from the reference at acceptable levels of reliability, temperature DHT22 deviate add, subtract, not more than 1% moisture had deviate, add, subtract, not more than 5% temperature measuring head Thermocouple. The results deviate, add, subtract, not more than 5% amplifier circuit OpAmp values less than the sensor directly because of IC OpAmp number LM358N. The limitation is a signal output, is not high, pressure is reached VCC if pressure VCC = 5V output voltage will not exceed the estimated 4V signal output, so to be issued. 5V only 3.72V.
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