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  • Author Author: rsc
  • Date Created: 2 Oct 2018 6:32 PM Date Created
  • Views 1010 views
  • Likes 14 likes
  • Comments 3 comments
  • intermediate micro:bit projects
  • microbit projects
  • microbit
  • intermediate_microbit_projects
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  • diytestinstruch
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MinMax - Calibration Box

rsc
rsc
2 Oct 2018
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When working with data acquisition systems, many times a signal doesn't behave as expected.  When diagnosing the problem, it's nice to have a reference voltage to test your inputs.

I made up this quick "MinMax" test box for quickly testing analog inputs.  The MinMax is built from four simple parts, a set of banana jacks for input voltage, a BNC output jack, a variable resistor, and a box.

I have one with a 1K 1 turn pot, and one using a 10 turn 100K pot for testing opamp circuits. VCC can be 3.3V, 5V, 12V, or whatever your circuit needs.  I made one up with a 1A analog meter inline also.

*** Note *** there is not a current limiting resistor inline, or a fuse, so if you short the BNC, you can short your power supply.

 

To use the box:

1) Apply power and ground to the red(+) and black(-) banana jacks

2) Connect BNC to DAQ input, and connect in parallel to voltmeter if needed.

3) Adjust output from 0-100%

 

Here's a schematic:

image

Here's the unit:

image

 

image

Simple, but useful.

Add a micro:bit, some switches, and display, and you have a programmable analog test instrument.

Since you sent me a micro:bit, here's a simple voltage output device program.

If button "B" is pressed, the voltage output is increased, if "A" is pressed, the voltage is decreased.

The voltage is approximated by the LEDs as a bargraph.

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Top Comments

  • genebren
    genebren over 6 years ago +5
    Simple is sometimes better complex. If it gets the job done, then all is good. Gene
  • shabaz
    shabaz over 6 years ago +3
    That's a cool name for a project : ) I've never thought of doing this, until very recently when I was trying to control 4 analog quantities. Until my project changed, I was about to build a general-purpose…
  • three-phase
    three-phase over 6 years ago +1
    Very useful project to build up. Kind regards.
  • three-phase
    three-phase over 6 years ago

    Very useful project to build up.

     

    Kind regards.

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  • shabaz
    shabaz over 6 years ago

    That's a cool name for a project : )

    I've never thought of doing this, until very recently when I was trying to control 4 analog quantities. Until my project changed, I was about to build a general-purpose box with 4 pots and a couple of switches, and the connections coming out to a DIL header instead of a BNC, so that jumper wires could be plugged in and patched to (say) a breadboard).

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  • genebren
    genebren over 6 years ago

    Simple is sometimes better complex.  If it gets the job done, then all is good.

    Gene

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