数字温度计毕业论文.doc

20092009 20092009 20095 11234520092009 20092009 2 AT89S521AT89S52DS18B2OLCD2345678910111AT89S52DS18B2OLCD 2 3 32009/3/272009/3/292009/3/302009/4/22009/4/32009/4/92009/4/102009/4/242009/4/252009/5/92009/5/102009/5/162009/5/172009/5/192009/5/202009/5/230.50.51. 2. 3. 1. 0.50.51 .19982 .19943 . 19894 .J.1999. 42009 1 52009 a+b10 1 1 2 3 4 530,4030 100 a40 b60 620092009 20092009 7 DS18B20AT89S52LCD, DS18B208ABSTRACTThis article will introduce the single-chip microcomputer-based control of a digitalthermometer is used to achieve single-chip temperature measurement, the traditionaldetection of most of the temperature thermistor for temperature sensor, but the poorreliability of thermistors, temperature measurement accuracy of low - , and must go througha special interface circuit to convert the digital signal processed by the single chip. The useof digital temperature sensor DS18B20 to AT89S52 microcontroller-based design of digitalthermometer with LCD digital control to the serial transmission of data, temperature display,accurate to achieve the above requirements, can be used for temperature measurement andother non-electrical signal, mainly used for more accurate temperature measurement sites, orresearch laboratory use, can work independently of the single-chip temperature detection,temperature control system has been widely used in many areasKey words ThermometerSingle-chipDigital Control DS18B209 1. 111.1. 111.2. 111.2.1. 111.2.2. 111.3. 111.3.1. 121.3.2. 122. 172.1. 172.1.1. AT89S52 172.1.2. AT89S52 172.2. 202.3. 213. 223.1. 223.2. 233.3. 243.4. 243.5. 254. PROTEUS 264.1. PROTEUS 264.2. PROTEUS 274.2.1. 274.2.2. 274.2.3. 284.2.4. 284.2.5. 294.2.6. 2910 4.3 304.3.1 304.3.2 314.3.3 324.3.4 334.4 34 35 361 372 453 464 PCB 47111 1.1 ,AT89S52DS18B20LCD, 1.2 1.2.1 A/DA/D 1.2.2 DS18B204.3. 1.1AT89S52DS18B20LCD121.1 1.3.1 AT89S52 1.3.2 DS18B20DALLAS9-12DS18B20DS18B203.05.5912DS18B203PR358SOIC2.2 LCD 131.2 DS18B2064ROM4856