Monday, February 19, 2007
Its the tip for your new fresh project. Most of the times it's hard to imagine rather than to do. I have been such kind of victim for a long time. This time it's simple - simple as ABC.
You can build a simple lowcost temperature which can precisely measure the temperature of body as well as sorrounding.With the dallas ds18s20 you can chew without teeth. Ds18s20 is a transistor like chip which feature internal adc converter and interfaces with one-wire technology.Its even easy to use ds18s20. It would be better in using with microcontroller and pic if you prefer the portability or even you can do so with you computers parallel port and a simple 30 lined c program. If you are interested in doing such projects then feel free to mail me. I'll be always helpful.
email me at ujwal2@gmail.com
1 comments:
LITTLE SPECIFICATION
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The DS18S20 Digital thermometer provides 9-bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20 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°C and is accurate to ±0.5°C over the range of -10°C to +85°C. In addition, the DS18S20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.
Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same 1-Wire bus; thus, it is simple to use one microprocessor to control many DS18S20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.
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Unique 1-Wire interface requires only one port pin for communication
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Each device has a unique 64-bit serial code stored in an onboard ROM
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Multidrop capability simplifies distributed temperature sensing applications
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Requires no external components
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Can be powered from data line. Power supply range is 3.0V to 5.5V
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Measures temperatures from -55°C to +125°C (-67°F to +257°F)
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±0.5°C accuracy from -10°C to +85°C
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9-bit thermometer resolution
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Converts temperature in 750ms (max.)
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User-definable nonvolatile (NV) alarm settings
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Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
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