Air pressure measuring

[Eugeniu]

Hi !

Have somebody some informations (diagram / code or any other) about air pressure measuring used sensor (any ) & PIC & PicBasicPro ? But , for humidity ?

Thank you very much !

[mackrackit]

Do you mean air pressure as in barometric or as in a compressor?

[Eugeniu]

Do you mean air pressure as in barometric or as in a compressor?

As in barometric application .

[mackrackit]

This should do the trick
http://www.omega.com/pptst/HX85.html
I have not used this particular model, that is why I asked if it was barometric.

Any how. The way I use other parts from this company is to set up a voltage divider to scale to 0 - 10 VDC down to 0 - 5 VDC. Then use a chip with an ADC port. At least 3 pins will be needed.

[Eugeniu]

This should do the trick
http://www.omega.com/pptst/HX85.html
I have not used this particular model,

Be sure , I do not use it , too . It is more expensive . I have , for a few $ , a Smartec pressure sensor type "SPD030G 0 – 2.0 Bar" .

[Charles Linquis]

I use a Silicon Microstructures sensor to measure very small amounts of pressure ( tenths of inches of water) . One of their products may be suitable for your use.

http://www.si-micro.com/

[Eugeniu]

I use a Silicon Microstructures sensor to measure very small amounts of pressure ( tenths of inches of water) . One of their products may be suitable for your use.

Yes ! In special with I2C bus . How much is it ? But is a big problem-in Romania I cannot find it . Have you a application diagram for analog out ?

[Archangel]

Yes ! In special with I2C bus . How much is it ? But is a big problem-in Romania I cannot find it . Have you a application diagram for analog out ?

Hello Eugeniu,
Got any automobile junk yards in Romania? Many cars built since the 1980s used a Baro sensor, some used a MAP sensor and others used a combo MAP/Baro sensor. A little research and some bone-yard shopping could result in what you want on the cheap, and then after you have proven your design, if you want a new sensor, you can get it at an auto parts distributor.

[RussMartin]

Not enough information!

What air pressure do you wish to measure?

[Charles Linquis]

I used the amplified analog out version and fed it into the A/D converter. With averaging, I get accurate .2" - 1.0" H20 readings.

[RussMartin]

My apologies to all; my reply was entered when there was only the original post present. I don't know why it took so long to appear!

Please disregard what otherwise seems to be a fairly silly belated question.