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Topic: first project - Density Altitude (Read 1 time) previous topic - next topic

smoothisfast

Jul 22, 2011, 07:50 am Last Edit: Jul 22, 2011, 08:07 am by smoothisfast Reason: 1
I want to build an arduino that can calculate the current density altitude.

The minimum information that I need are:

1) Actual pressure (station pressure) in Hg
2) Temperature in Celsius

Would like to output it to a display.

I plan to use the Arduino uno kit but with so many sensors for temperature and barometric pressure I don't know which one would be best for my first project.

I want to upgrade this project with altitude, angle compass and gps in the future.

help with sensor selection and screen is greatly appreciated at this point.



joop

Go throught the Arduino shield list and search for available shields. It's the easiest way to get started.

CrossRoads

"It's the easiest way to get started", maybe if the shields are still available.

Get something like this
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TP-29-ND
Measure the analog voltage it creates with temperature.
May need some amplification.
Or maybe this
http://www.gravitech.us/i2c12ditese.html

Barometer like this, SPI interface.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MPL115A1T1CT-ND
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

CrossRoads

http://wahiduddin.net/calc/density_altitude.htm

Good page, from an aviation viewpoint.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

markbee

You might have a look at this:

http://www.ladyada.net/learn/sensors/bmp085.html

markbee
XBee blog: http://lookmanowire.blogspot.com/

CrossRoads

Temp/Humidity
http://www.sparkfun.com/products/10167
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

markbee

How do you calculate the density altitude from humidity & temperature? ;)

markbee
XBee blog: http://lookmanowire.blogspot.com/

CrossRoads

See  reply #3 markbee. Need the other elements also.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

smoothisfast

#8
Jul 27, 2011, 10:51 pm Last Edit: Jul 27, 2011, 10:55 pm by smoothisfast Reason: 1
Just finished looking over the math and figured out the formulas for calculating Density Altitude.

Here are the information I need to run the math:

Temp
Relative Humidity
Station Pressure


I do need a humidity sensor. After doing some reading and searching I think I will start with this sensor for humidity

http://www.sparkfun.com/products/10239

and this board for Barometric Pressure and Temperature

https://www.adafruit.com/products/391






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