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Thread: Got something cooking :)

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    Cooking up an all in one Pickup mesuring device LCR and resonant peak

    More info later
    Click image for larger version. 

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    Last edited by Claus H; 03-15-2019 at 10:14 AM. Reason: Title

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    Twobie
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    arduino a 2x16 (?) and lots of wire - I like where this is going!
    Waiting for your update...

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    "Thermionic Apocalypse" -JT nickb's Avatar
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    Cool idea!

    Hmmm... DC resistance measurement is easy. So is the resonant frequency and 3dB bandwidth provided you know the driving level of a sine wave stimulus. From that info you can calculate the L and C.


    I think you can do it with a square wave source too but there will probably be some compensation required for the effect of all the harmonics - I need to think about that.

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    Experience is something you get, just after you really needed it.

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    Senior Member LtKojak's Avatar
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    Quote Originally Posted by Claus H View Post
    More info later
    Click image for larger version. 

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    You need to incorporate the capability of measuring TEMPERATURE. Then it'll be really useful as a tool for both p'up makers and aficionados as well.

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    Pepe aka Lt. Kojak
    Milano, Italy

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    Quote Originally Posted by LtKojak View Post
    You need to incorporate the capability of measuring TEMPERATURE. Then it'll be really useful as a tool for both p'up makers and aficionados as well.
    Thanks guys!!! I am working on getting it accurate and reliable even with a 9 volt battery supply, it will feature Gauss metering, and Resonant Peek, Inductance, Capacitance, DC resistance it can do all of it now, but still jumping around some wires need a few good reed relays, but it's getting close, it does sine waves for the resonant peek and Induction/capacitance, and some math it's relative simple circuit, but with a lot of tolerances and stray capacitance, you need to stay on top of to get the thing working! Arduino code is also quite simple would love some more resolution the 10bit ADC is OK, I love to work with the constraint of simple yet smart design, I could slap a lot of circuitry on the thing to get it going, but have been scaling down the last month or so of design, got the thing working fine but it just go messy, so started over..

    It's looking good now, need a good switching regulator design, and the reed relays.. It will be all self contained with a couple of clips for the pickup wire, and a gauss probe..

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    Hi Claus

    I'll be up for one of these when your finished, seems very elegant. I'd be quite happy to supply my own enclosure. Pepe's got a good point about a temperature sensor as dc resistance in a pickup varies quite a bit with temperature.

    Cheers

    Andrew

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    Quote Originally Posted by LtKojak View Post
    You need to incorporate the capability of measuring TEMPERATURE. Then it'll be really useful as a tool for both p'up makers and aficionados as well.
    Temperature sensor will be on the back of the gauss sensor..
    Programming is done
    Still a ways to go but got stuff working nicely now..Click image for larger version. 

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    Senior Member SoulFetish's Avatar
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    I'm assuming you are using the on board 10bit-ADC in the arduino. If you want better resolution, the ADS1115 16-Bit ADC is pretty cheap. It's 4-channel with programmable gain (I think). Maybe a little overkill and quick search will probably yield some other options, but it's just a thought.

    great project idea though! nice work

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    If I have a 50% chance of guessing the right answer, I guess wrong 80% of the time.

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    Please consider adding a DC impulse coil for coil polarity sensing on humbuckers.

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    Quote Originally Posted by David King View Post
    Please consider adding a DC impulse coil for coil polarity sensing on humbuckers.
    Will do

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    Hi Klaus

    Any updates? you've whet my appetite !!!

    Cheers

    Andrew

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    Quote Originally Posted by the great waldo View Post
    Hi Klaus

    Any updates? you've whet my appetite !!!

    Cheers

    Andrew
    Yes finaly got the phase checker finished..

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    Quote Originally Posted by the great waldo View Post
    Hi Klaus

    Any updates? you've whet my appetite !!!

    Cheers

    Andrew
    Phase indicator done..
    Click image for larger version. 

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    Hi Klaus

    IT's looking very good.,
    Cheers
    Andrew

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    Old Timer tedmich's Avatar
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    looks good!
    Am reminded of one of my favorite quotes:
    Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu le loisir de la faire plus courte.
    I would have written a shorter letter, but I did not have the time.

    Blaise Pascal

    By this I mean don't try to make it do everything conciseness is a difficult but desirable goal IMHO.

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    Quote Originally Posted by tedmich View Post
    looks good!
    Am reminded of one of my favorite quotes:
    Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu le loisir de la faire plus courte.
    I would have written a shorter letter, but I did not have the time.

    Blaise Pascal

    By this I mean don't try to make it do everything conciseness is a difficult but desirable goal IMHO.
    Well, the original post says all in one. So get as much useful stuff into it as possible !!!
    Cheers

    Andrew

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    Where does the line start ?

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    How long's a foot!

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    Quote Originally Posted by Lyrebird Steve View Post
    Where does the line start ?

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    Thanks guys it's still a work in progress, everything works now, need to get it on a pcb and getting to the point where I can build a couple of units..


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    Tak for det Claus! Jeg er meget interesseret!

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    Hi Klaus

    Any updates on the meter ?
    Cheers
    Andrew

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    Quote Originally Posted by Claus H View Post
    Thanks guys it's still a work in progress, everything works now, need to get it on a pcb and getting to the point where I can build a couple of units..

    I'll take 1

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    HI Claus

    Anything new on the measuring device ?
    Have a good weekend.
    Cheers
    Andrew

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    Senior Member salvarsan's Avatar
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    Quote Originally Posted by Claus H View Post
    would love some more resolution the 10bit ADC is OK, I love to work with the constraint of simple yet smart design,
    The ARM-based Arduinos all have 12bit ADC and many of them cost less than $20 US.

    Since the ARM CPUs have more memory and MIPS, floating point arithmetic is fully implemented in the Arduino/gcc libraries and in the printf() family of functions.

    If the Arduino has an ARM Cortex M4, the floating point is in hardware and quite fast -- if you use floats instead of doubles.

    -hizself

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    The lofted fewmet doth soon hew close to yon whirling blades.

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