Help with electronics?

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spacey
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2012/09/10 10:22:42 (permalink)

Help with electronics?

Not comfortable with asking here but ya never know...
 
Problem is I know very little and have a problem to solve.
 
I want to count rotations using a self powered counter triggered
by a Hall Effect switch.
I have all the components that I believe will work (some I'm waiting to arrive).
 
I've used a magnetic reed switch but it's mechanical limits have seemed to exhaust
at @900 rpm. ( the Hall Effect sensor I've selected is rated at 7200.)
 
The schematic from power supply to sensor would sure save me so time if someone
could help. I can supply main component specs.
 
 
 
 
#1

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    offnote
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    Re:Help with electronics? 2012/09/10 11:07:53 (permalink)
    interesting project, what kinda rotation do you want to count?
    #2
    spacey
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    Re:Help with electronics? 2012/09/10 11:13:05 (permalink)
    Spinning disc is easiest description. Not unlike counting gear rotation only
    with one local magnet. ( South polarity)
    #3
    bitflipper
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    Re:Help with electronics? 2012/09/10 13:57:32 (permalink)
    Do you just want the count to be displayed on a 7-segment LED, or does the data need to be logged to a computer? 

    If the former, that's pretty easy. An op-amp after the hall-effect switch driving a counter chip or series of flipflops. How many stages for the counter depends on how big the numbers might get before overflowing. The binary output of the counter(s) goes to a couple cascaded 7-segment decoder chips. Rather than building a power supply from scratch, I'd just use a generic wall-wart type power supply and add a voltage regulator and some filtering.


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    #4
    spacey
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    Re:Help with electronics? 2012/09/10 15:45:01 (permalink)
    Bit it just needs displayed. The Cub3 will be used and has a reset.

    I've just learned that the Hall Effect is open collector and the Cub3 was designed
    to operate with an open collector transitor.

    If I'm right in my thinking...the wall wart I've chosen will power the 3.5/ 5.V power
    supply for the breadboard to the Hall Effect and send to counter will do it.

    I also have another reed switch to try if the Hall Effect circuit fails and I have to
    go back to drawing board.
    If I can reach 2,000 with accurate count I'm home.

    I'll post when I know. Appreciate ya Bit.

    Oh...the reason I'm not using PC is I'm not using a traverse. All scatterwound for now.



    #5
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