hi guys, pls help
Iam trying to design a weather station with the following requirements;

The Data required to be collected are Temperature, Wind Direction, Wind Speed and Atmospheric Pressure. Im not sure wot sensors should be used?. The system should include signal conditioning and amplification that may be needed for each sensor, the maximum input to the A/D converter is to be limited to 5V DC.

any tips and advice would be very much appreciated.

I hope you guys can spare a minute or 2.

Thanx!

 

There is much on the web showing various sensors and methods and it can vary from pretty simple and basic to quite involved and expensive. First you have to define if you wish for wireless or can run signal and power wires between your outside instrumentation and your A/D and readout device.

The only thing I will pass on here is about the pressure sensor for reading barometric pressure changes as many people select and purchase the wrong kind of pressure sensor. You will need to make sure your pressure sensor is of the absolute pressure type rather the the gauge (of differential pressure) type. The data sheets for pressure sensors are not always crystal clear on what type they are and the proper one will state absolute pressure somewhere in the data sheet. Only the former type has a vacuum reference pressure built into it so as to be able to track atmospheric pressure changes.

Lefty

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Temp: LM35
Press: Honeywell SDX series

More ? Google!

Cheers,
Hannes.

 

One can not talk about weather stations without mentioning Dallas 1 wire networks.

3v0

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3v0,

absolutely, Dallas/Maxim also makes cool stuff:
Sensors (Including IEEE-P1451.4 Plug-and-Play Sensors) - Parts List

Cheers,
Hannes

 

Since everything is going to a ADC, you're going to want to keep everything analog obviously. For a temp sensor, look at the AD590. Windspeed will have something mechanical involved but could end up as a frequency to voltage converter. Wind direction, again something mechanical. Do they want you design the mechanical parts, or are they already known..

 

hi,
Look at Oliver's setup, most excellent.!
Weather Display Live Kenley

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Purchasing a cheapy weatherstation desk top toy and tapping the sensor outputs into a PIC might be the go.

 

If you want a weather station including the observation, collection and evaluation of weather data and phenomena for a local weather forecast you should risk a look into ELV - Das Elektronik-Versandhaus | ELV Elektronik.

They have a wireless weather station and offer lots of sensors with it, e.g. amount of precipitation, relative and absolute humidity, dew point calculation etc.

Check for "Funkwetterstation".

Caution: The weather station works only with the custom developed chip by ELV.

Boncuk

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