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  1. #16
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    RPM-meter-schematic-diagram-alternative.jpg

    Is this how you wired it ?

    Rick

  2. #17
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    Rick
    yes thats it
    peter

  3. #18
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    I have the same Tacho and mine is wired the same way. Led on the sensor is on and the Tacho display reads 0000 without machine running. Not sure what is going on with yours. It is unusual with two giving you the same result.

    I am powering mine with a 9V plug pack from an old cordless phone. Have you checked what voltage yours is putting out with a multimeter?

  4. #19
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    I just disconnected the sensor and it still will read 0000, does yours do the same or will it still display 5997 RPM?

  5. #20
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    Quote Originally Posted by Com_VC View Post
    I have the same Tacho and mine is wired the same way. Led on the sensor is on and the Tacho display reads 0000 without machine running. Not sure what is going on with yours. It is unusual with two giving you the same result.

    I am powering mine with a 9V plug pack from an old cordless phone. Have you checked what voltage yours is putting out with a multimeter?
    My power supply is putting out 14V. I think I have a couple of 12v plug packs which I'll dig out tomorrow although as the Tacho is supposed to run on 8-24V I cant see how that would be a factor. However desperate men etc.

    When I disconnect the sensor the readout displays 0000

    I've just gone and checked both, they are almost exactly the same. I have also swapped the sensors with no difference.
    I wish I could get the same sort of odds buying a lottery ticket.

  6. #21
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  7. #22
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    Quote Originally Posted by bollie7 View Post
    The red LED at the back of the sensor lights up but the readout immediately goes to around 5997 RPM.
    Is the light and get brighter when the magnet gets closer ?

    Do you have a photo of your wiring just in case you missed something, not that I doubt you but stranger things have happened

    Rick

  8. #23
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    Quote Originally Posted by Com_VC View Post
    The number on both the sensors is SJA12-10N1

  9. #24
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    Quote Originally Posted by warrick View Post
    Is the light and get brighter when the magnet gets closer ?
    Not that I have noticed

    Do you have a photo of your wiring just in case you missed something, not that I doubt you but stranger things have happened

    Rick[/QUOTE] Better than that. This link is to the short video I made of the first tacho to send to Banggood.

    https://youtu.be/X1iziOhrMK4

    I think i have the wiring correct but I'm certainly open to be corrected if I havent.

  10. #25
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    Quote Originally Posted by bollie7 View Post
    Not that I have noticed

    I think i have the wiring correct but I'm certainly open to be corrected if I havent.
    Peter,
    If you have the wiring correct then there should be the LED on and it gets brighter when the magnet is in close proximity, I also think that it is pole sensitive (i.e. it likes one side of the magnet to the other)
    It is very hard to see the wiring as it is twisted and the camera is moving so a photo would be better, also a photo of the sensor showing the diagram on it


    Rick

  11. #26
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    Rick.
    The orientation of the magnet doesnt change anything. I have just tried it from both sides.

    Yes the LED does get brighter when the sensor is closer to the magnet. Changes approx 6 or 7 mm from the magnet.

    Whe the sensor is not close to the magnet the readout shows this.

    tach numeral.jpg


    Closer than 6 or 7 mm the LED is brighter and the read out shows this

    tach bar.jpg

    Wiring pic

    wiring.jpg

    sensor
    label

    digram 02.jpg digram 01.jpg sensor 003.jpg

    thanks
    Peter

  12. #27
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    I'd try a different power supply. Yours may not be filtered well enough. Even a battery - say cordless drill battery.



    Russ

  13. #28
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    Quote Originally Posted by russ57 View Post
    I'd try a different power supply. Yours may not be filtered well enough. Even a battery - say cordless drill battery.



    Russ
    If I remember correctly I had problems when I first tried hooking one up and realised I had a AC powerpack so using another source would be a good suggestion.
    I went out to my shed and checked the wiring on mine and it is exactly the same as yours Peter so the power supply look to be the only thing to change now

    Rick

  14. #29
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by bollie7 View Post
    My power supply is putting out 14V. I think I have a couple of 12v plug packs which I'll dig out tomorrow although as the Tacho is supposed to run on 8-24V I cant see how that would be a factor. However desperate men etc..
    My experience is that just using a multimeter to measure the output of a PS often misses most of the story. Some are super noisy and/or show a fair bit of residual AC - try measuring its AC output.

  15. #30
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    Quote Originally Posted by warrick View Post
    so the power supply look to be the only thing to change now Rick
    I tried a 9V plug pack supply just now and the results look very encouraging. Learn something new everyday. It gives a read out that is very close to what I'm getting from the hand held optical one I have here. Next step is to see if it works with the 12V supply I have on the mill for running the lights and the fans in the VFD enclosure.

    Thanks so much to all who have offered suggestions. I really appreciate the help.
    Peter

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