Abstract Along with society's progress, the people environmental protection consciousness enhancement, the atmospheric environment examination is more and more important, specially the urban population sharp growth, the air pollution already became day by day serious.This article through has done the preliminary study and the discussion to the atmospheric environment examination object, has analyzed in the atmospheric environment main pollutant as well as the correlation detection standard, after but unifies the actual situation, to in the atmospheric temperature, the humidity, the noise intensity carries on the examination and the record.After analyzes its principle of work had determined the system control structure, the control technology, the control strategy and the control chip and so on, and carry on the system hardware electric circuit the design and the software procedure compilation. Based on the monolithic integrated circuit to the digital signal high sensitive and the controllability, the humiture sensor may produce the simulated signal, with the A/D analog-digital transformation chip performance, I designed a set of examination system, electric circuit, temperature examination, humidity examination, noise intensity examination, keyboard and demonstration, system software the part and so on transformed, the monolithic integrated circuit including A/D, repositions designs.Processes with AT89C51 comes from the temperature sensor DS18B20 data, as well as transforms after through ADC0809 humidity sensor HM1500 and the audio frequency amplification electric circuit data, after AT89C51 read data delivers the data in the buffer, carries on the real time display through the LED nixietube. The display circuit part is connected with HD7279A and the monolithic integrated circuit, is composed by 9 common cathode LED nixietube.9 LED nixietubes use in demonstrating the temperature, the humidity and the noise intensity.
