sensor

Discussion in 'General Electronics Chat' started by aka-rato, May 14, 2012.

  1. aka-rato

    Thread Starter Member

    May 11, 2012
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    Hey guys

    i need an a agent help, what can i use to power my sensor it is a pressure sensor and how will i know that it is reading:confused:
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    What sensor?
     
  3. aka-rato

    Thread Starter Member

    May 11, 2012
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    i did mension.:)
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Do you have a datasheet of the sensor?
    A link to the datasheet will also help.

    Bertus
     
  5. aka-rato

    Thread Starter Member

    May 11, 2012
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    I ws trying to figure out how to attach but i cant so the sensor im refering to is AWM5000 series u can google it.
     
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    From the FAQ:

    Hello,

    Do you mean this sensor?
    http://sensing.honeywell.com/index.php?ci_id=3108&la_id=1&pr_id=25884
    Bertus
     
  7. aka-rato

    Thread Starter Member

    May 11, 2012
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    thanks. yes thats the sensor im talking about.
     
  8. cork_ie

    Member

    Oct 8, 2011
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    The sensor you refer to is A Mass Air Flow sensor , not a pressure sensor
     
  9. #12

    Expert

    Nov 30, 2010
    16,247
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    Rather difficult to get a clear answer from the spec sheets but I think I've got it nailed down to:
    Pin 1 = power = 8 to 15 Vdc
    Pin 2 = ground
    Pin 3 = no connection
    Pin 4 = output voltage.
    The output will be 1 to 5 volts in linear relationship to mass flow of zero to 20 standard liters per minute.
     
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  10. aka-rato

    Thread Starter Member

    May 11, 2012
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    Im stil not getting something right, i want to use Led as my output but i do not get any results, is"t because my connection is wronrg or my sensor os not working. i connected pin 1 tothe supply of 15v then pin 2 to the negative of my led which goes to the negative off the supply and the last pin 4 to the positive of my led. please help:confused:
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    As the output of the sensor varies with the flow through the sensor, you can not connect a led directly.
    If you want to connect ONE led, you will need a comparator circuit that can show if the output voltage has gone over a certain level.
    If you want more leds (that can show the amount of flow) you will need a circuit with a LM3914, that can show 10 levels linear.

    I have attached the datasheet of the LM3914.

    Bertus

    PS I did not have a reaction on the last PM I send you.
     
    Last edited: May 17, 2012
  12. aka-rato

    Thread Starter Member

    May 11, 2012
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    please people come to my rescure on this one.
     
  13. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    If you use a comparator circuit, you can set a value of flow with the potentiometer in this circuit:

    [​IMG]

    The potentiometer can have a value of 10K , the given resistor can be from 100K to 1M Ohms.

    This is the full page where the circuit comes from:
    Positive feedback

    Bertus
     
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  14. aka-rato

    Thread Starter Member

    May 11, 2012
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    :)
    This is brilliant, exactly what i needed. Thank you in million times.:):):)
     
  15. aka-rato

    Thread Starter Member

    May 11, 2012
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    OK! Im stuck again i do not get any flow reading, actually what i wanted to do is to use the LED to show my flow.
     
  16. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    As in the post from #12:

    Rather difficult to get a clear answer from the spec sheets but I think I've got it nailed down to:
    Pin 1 = power = 8 to 15 Vdc
    Pin 2 = ground
    Pin 3 = no connection
    Pin 4 = output voltage.
    The output will be 1 to 5 volts in linear relationship to mass flow of zero to 20 standard liters per minute.

    Can you measure the output voltage with a MultiMeter between pin 4 and 2 of the sensor, with and without flow?
    (4 is the red and 2 is the black probe from the meter).

    Bertus
     
  17. aka-rato

    Thread Starter Member

    May 11, 2012
    58
    0
    Hey!

    thanx i got it.
     
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