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Group 31Q APSC 100 November 2,2002
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Humidity Team Billy Smith Jacob Black Temperature Team George McDonald Keith Brown Supervised by… Dr. Geoff Lockwood Project Manager Bob
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1.What We Learned 2.Our Goal 3.Preliminary Design 4.Components 5.Progress Report
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Tutorial 1: How to construct circuits using bread-boards How to measure voltage, current, and resistance (i.e. Resistance in parallel is R=1/R1 + 1/R2 + …1/Rn) Tutorial 2: Learned about operational amplifiers so that we can now add, subtract, integrate, and take the square root of the signal Tutorial 3: Gained Experience using an analog to digital converter and seven segment displays (i.e. Binary “1001” = Digital “9”)
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Learn to build and analyze simple circuits Produce an inexpnsive (<$200) weather station suitable for home use Temperature Range will be –40 O C to 40 O C with accuracy within a degree Humidity will range from 0% to 100% with accuracy within 2%
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1)LM555 Timer/Square Wave Clock 2)AD7819 Analog to Digital Converter 3)Temperature Transducer Circuit 4)Humidity Transducer Circuit
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1)LM555 Timer/Square Wave Clock 2)AD7819 Analog to Digital Converter 3)Temperature Transducer Circuit 4)Humidity Transducer Circuit
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Used to generate a square root wave Sends an analog “clock” signal to the AD converter Square root wave produces intervals of reading and sampling of the analog input signal
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Using an AD789 linked with the DM9368 common cathode display driver and a seven segment display we can: Convert analog signal from transducers to a binary code Convert binary code into a digital display (i.e. Temperature, Humidity, Wind Speed, and Pressure)
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LM35 precision integrated-circuit temperature sensor 0.5°C accuracy guaranteeed (at +25°C) Rated for full -55° to +150°C range
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An amplifier may be required Given temperature range produces a signal within 1v
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HIH-3605-A transducer circuit allows us to read the relative humidity Send an analog signal to the AD (Analog/Digital Circuit) converter
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Transducer outputs within target range of AD Converter
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The group has been co-operating well due in no small part to the excellent Project managers Next step will be two implement the temperatore and humidity transducers The Clock and the Analg / Digital Converter have been constructod and vigorosly tested
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