Results 1 to 4 of 4

Thread: Voltage Sensor calculations

  1. Voltage Sensor calculations

    I'm using the P1117 voltage sensor to read an Analog input from an external temp sensor. From the docs for the voltage sensor Voltage (in volts) = (SensorValue - 500) x 0.06

    The external temp sensor (not a Phidget device) gives me 0 to 10 volts and is a linear representation for -30F to 220F. Am I correct with 10 / 250 = 0.04 volts per step?

    It must be this head cold because I can't get the calculations to come out right and I know I'm missing something simple.

    Actual display on external sensor:67
    Phidget reading from voltage sensor=562 (Ratiometric = True) should mean 3.72 volts in
    Actual voltage reading 4.11v (my uncalibrated meter)

    I would think 3.72 / 0.04 should produce my results but I come up with 93. What am I doing wrong. It has to be something simple.. I hope.

    Thanks
    David

  2. #2
    Join Date
    Sep 2006
    Location
    Carol Stream, Illinois
    Posts
    1,695
    Images
    118
    Rep Power
    106

    Re: Voltage Sensor calculations

    If you use any non-Phidget sensor with the 8/8/8, you need to make sure there is only 5V going to/from the board.

    �In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed�
    - Charles Darwin

  3. Re: Voltage Sensor calculations

    Alex,

    The P1117 is the Phidget -30 to +30 voltage sensor. Are you saying it's only good for measuring 5 volts on the input? The external temp sensor is rated at 0 to 10 volts but it's being fed into the voltage sensor.

    David

    Quote Originally Posted by Alex View Post
    If you use any non-Phidget sensor with the 8/8/8, you need to make sure there is only 5V going to/from the board.

  4. #4
    Join Date
    Sep 2006
    Location
    Carol Stream, Illinois
    Posts
    1,695
    Images
    118
    Rep Power
    106

    Re: Voltage Sensor calculations

    The sensor board itself cannot be over 5V. The Phidget Voltage Sensor is rated for -30 to +30 V, but the board itself is powered by 5VDC and returns a 0-5V analog signal. Sorry if my explanation isn't too clear. I'm not that well versed in EE stuff. I know concepts, but just not the "lingo"

    �In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed�
    - Charles Darwin

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. FlexiForce with voltage divider
    By super-d in forum Sensors
    Replies: 5
    Last Post: 04-24-2009, 11:10 PM
  2. Replies: 19
    Last Post: 01-21-2009, 10:32 AM
  3. Help with Voltage and 20AMP software
    By Kenarcher in forum Arbotix, Microcontrollers, Arduino
    Replies: 0
    Last Post: 02-27-2007, 02:07 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •