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Help, Using Arduino to high current 12volts inputs and output

Discussion in 'Microcontrollers, Programming and IoT' started by Keng, Nov 28, 2015.

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  1. Keng

    Keng

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    Apr 12, 2013
    Hi guys, I just wondering if someone make it already, I am going to start using Arduino to my projects, but, I need that the Arduino read 12volts signals and the Arduino drive 12volts outputs, I have a circuit in mind, but I dont know if this exist already, if dosent exist yet can someone help me out?

    Thanks in advantage...

    Merry Christmas

    Peace
     
  2. Arouse1973

    Arouse1973 Adam

    5,164
    1,081
    Dec 18, 2013
    Hi Keng
    It's not quite Christmas yet, but thanks. I don't think you can put 12Volts into the Arduino. You can obviously scale it down to say 5 Volts. And then work out your actual input voltage from that. And the arduino can't output 12 Volts either. But again you can scale this up to give your system a 12 Volts output.
    Adam
     
  3. Keng

    Keng

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    0
    Apr 12, 2013

    Hi, Thanks, this is the reason why I ask, I know that the Arduino can just handdle 5volts like Pic do, so, this is my question? How to do it. I have in mind make some kind of PCB with maybe solid relays or some Mosfet? And howwill be the best option to reduce the 12volts to 5volts to make the Arduino read the 12volts signals?

    Thanks
     
  4. Minder

    Minder

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    Apr 24, 2015
    For the inputs you could use a series resitor and an 5v Zener, the input would come from the junction of the R & Z.
    For outputs use a mosfet with a logic gate input. The 2n7000 is usefull for low current level outputs, or if more than a few, the ULN2805..
    M.
     
    Keng and Arouse1973 like this.
  5. Keng

    Keng

    71
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    Apr 12, 2013

    Hi, Thanks, this is the reason because I ask, I know that the Arduino can just handdle 5volts like Pic, so, this is my question? How to do it. I have in mind make some kind of PCB with maybe solid relays or some Mosfet? And howwill be the best option to reduce the 12volts to 5volts to make the Arduino read the 12volts signals?

    Thanks

    Thanks Minder, Can you please show me some diagram how to connect the resistor and the zener? Any 5volts zener will work? The input signal will be maybe 15volts at max, and I need to drive like 6 amp, I will like to use SMD components, any recomendation about a mosfet to drive at least 15volts and 6amp? I am using this projects in cars and motorbikes. Thanks again
     
  6. Minder

    Minder

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    Apr 24, 2015
    The IRL630 is good for 6amps.
    M.
     

    Attached Files:

  7. Keng

    Keng

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    Apr 12, 2013
    Thanks a lot for the diagram...

    the IRL630 is out of stock in digikey and kind expensive in ebay
     
  8. Minder

    Minder

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    Apr 24, 2015
  9. Keng

    Keng

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    Apr 12, 2013
    No in stock for me, the IRL630

    The irlr024n work for me...

    About the zener diagram,the input go to the 15volts signal and the signal source to the arduino? or back forward and the input is output? Thanks again
     

    Attached Files:

  10. Minder

    Minder

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    Apr 24, 2015
    Input is to Arduino , signal source is wherever 15v is comming from.
    M.
     
  11. Keng

    Keng

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    Apr 12, 2013
    Ok, thanks again, can I use SMD resistors like 1206 size or is better a bigger resistors size. power?
     
  12. Minder

    Minder

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    640
    Apr 24, 2015
    Low power is fine.
    M.
     
  13. Keng

    Keng

    71
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    Apr 12, 2013
    Great, thanks again
     
  14. Keng

    Keng

    71
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    Apr 12, 2013
  15. Minder

    Minder

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    Apr 24, 2015
    This gives an idea what to use in the base of the Mosfet.
    See Q2 ignore the rest..
    D2 R2 R4.
    [​IMG]

    M.
     
  16. Keng

    Keng

    71
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    Apr 12, 2013
    Great, thanks
     
  17. Keng

    Keng

    71
    0
    Apr 12, 2013
    Minder, I just see that I need 15volts + from the Mosfet, I think that this will not work for me???
     
  18. Minder

    Minder

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    640
    Apr 24, 2015
    I using a μproc with a 5v out then a logic level mosfet is the easier choice.
    M.
     
  19. Keng

    Keng

    71
    0
    Apr 12, 2013
    Thanks, Can you show me some diagram and what component I will need?
     
  20. Minder

    Minder

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    640
    Apr 24, 2015
    Post #15 D2, R2, R4, Q2 (IRL630).
    M.
     
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