外文翻譯--基于單片機(jī)的溫度和濕度數(shù)據(jù)采集系統(tǒng)的設(shè)計(jì)（英文）

1、2011 International Conference on Electronics and Optoelectronics (ICEOE 2011) Based on Single-Chip Microcomputer Temperature and Humidity Data Acquisition System Design Xu Yan Guo Tao Zhu lie (Key Laboratory of Instrum

2、entation Science C 1, C2 and C2 value, as shown in table I and output humidity data about. Median TABLE I HUMIDITY TRANSFORM COEFFICIENT SORH C1 C2 C3 12bit -4 0.0405 -2.8* 1 0-6 8bit -4 0.648 -7.2* I 0-4 &

3、#176; When meaSUrIng temperature wIth 25 C large dIfference, in order to compensate for temperature of humidity measurement impact, use type (2) correction output value RHtrue = (T - 25) (tl + t2 * SORH) + RH1 (2

4、) Among them: for RHtrue RH1 compensation temperature influence after the humidity value, tl and t2 values as shown in chart 2, and output Humidity data digits are concerned TABLE II TEMPERATURE COMPENSA nON COEFFICIEN

5、TS SORH t) t2 12bit 0.01 0.00008 8bit 0.01 0.00128 SHT75 by gap materials PTAT (is proportional to the absolute temperature) r &d of temperature sensor has excellent linearity. The following formula will be ava

6、ilable SHT75 digital output conversion for temperature: Temperature = dl + d2 * SOT Among them: for SHT75 SOT output 12 or 14 temperature measuring values. D1 and SHT75 working voltage related, d2 and output of t

7、emperature data digits about such table 3 shows: TABLE III. TEMPERATURE CONVERSION COEFFICIENT dl VDD d)[°C] d)[OF] 5V -40 -40 4V -39.75 -39.50 3.5V -39.66 -39.35 3V -39.60 -39.28 2.5V -39.55 -39.23 d2

8、digits d£C] d£F] 14bit 0.01 0.018 12bit 0.04 0.072 D. Temperature and Humidity acquisition software parts In this paper the software used for Silicon Laboratories IDE. Program is mainly to the sensor'

9、;s operation, the collection temperature and humidity data processing and thecan communications. And humidity sensor receives PC to send data transmISSIOn command, began extracting temperature and humidity collected

10、 to store in C8051F060 RAM the temperature and humidity of the data, then start thecan transmission, upward place machine transmit data [61. Silicon Labs CAN work bit rate CAN reach 1-m bit/SEC, actual rate may be affect

11、ed by the CAN bus on selected data transfer physical limitations. Thecan processor 32 news object that CAN be configured to send or receive data. Input data, message object and its logo mask stored in RAM CAN message. A

12、ll the sending and receiving data filtering agreement by CAN handle all finished, need not CIP controller - 51 intervention, this would make for the CPU CAN communication bandwidth is the smallest. CIP - 51 through

13、 special function registers configuration CAN controller, read the received data and writing ready to send data. The CAN controller clock equals CIP - 51 MCU clock (SYSCLK). IV. TEST AND ANAL YSIS OF THE RESULTS Th

14、e paper introduce debugging good system has been conducted, and separately carried on the static and dynamic tests, collected experimental data. From the microcontroller memory read out data fig.3 shows, this syst