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Message: <blockquote data-quote="Little DJ" data-source="post: 10928208" data-attributes="member: 320663">Let's Make a Thermometer with DB18B20Dallas 18B20<img src="http://1.bp.blogspot.com/-EuhBNsDnmjc/TmWQSqXLHqI/AAAAAAAAAJ0/7KBCoP0nF4I/s1600/DS18B20.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55°C to +125° and is accurate to ±0.5°C over the range of -10°C to +85°C.Here the thermometer (Dallas 18B20) senses the environment temperature and then sends that value as a digital input with 16bit binary code to the microcontroller.  It could measure temperatures from -55°C to +125°C (-67°F to +257°F). Dallas 18B20 uses 1 wire bus system to communicate with the microcontroller. The 1-Wire bus system uses a single bus master to control one or more slave devices. The DS18B20 is always a slave. When there is only one slave on the bus, the system is referred to as a ‘single-drop’ system, the system is ‘multi-drop’ if there are multiple slaves on the bus.Circuit Diagram <img src="http://3.bp.blogspot.com/-YPbDkVmJl24/TmWR7nC7tGI/AAAAAAAAAJ4/GB2ru9JgQx4/s1600/DS18B20.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />[YOUTUBE]J9XSIBjwY88[/YOUTUBE]Download MikroC code and PROTEUS Design: <a href="http://www.electronicworkspace.com/2011/09/ds18b20-with-16f877a-thermometer.html" target="_blank">Click Here</a></blockquote>

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