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Arduino Uno, amperage - What current can be drawn from this board?

quadrox31 21750 9
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 14135966
    quadrox31
    Level 9  
    Hello
    Earlier, I wrote about the connections of a model that I am building and I partially managed to do it, but I am intrigued by one thing, namely, how much electricity can I get from the 5V port?
    I have several elements, i.e. a sensor (consumption 100 mA), a flow meter (15mA) and a motor controller, which if I remember correctly consumes about 36mA. The question is - will the 5V output be able to deliver this current?
    If not, maybe someone has been affected by this problem and will know what to do about it? :)

    Regards
    Rust on Embedded Online Conference on 16 July with 33 per cent discount for elektroda users
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  • #2 14135995
    vonar
    Level 28  
    quadrox31 wrote:
    Will the output marked 5V be able to deliver such a current?

    Yes.
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  • #3 14135997
    quadrox31
    Level 9  
    Thank you very much for your reply :)
    And out of curiosity, what maximum current will this plate pull?
    Regards
  • #4 14136033
    vonar
    Level 28  
    It depends.
    View the diagram.
    When powered from USB, the maximum is 500 mA for the entire board. When using the entrance VIN the U1 stabilizer is important. It has an output current of 1A, but the limitation will be, as usual, power loss and temperature. The higher the supply voltage, the less current available. It also depends a bit on the cooling conditions of the PCB (ambient temperature, air flow). Of course, you also have to subtract the consumption of both microcontrollers (including the load on the M328 output pins) and the 3.3V bus.

    With the recommended 7-12V power supply, you can count on these ~ 150mA for external circuits. Probably a little more, but how many exactly is hard to say.
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  • #5 14136052
    monekx
    Level 14  
    Apparently the entire board will pull 500mA from USB power, from external to 800mA, but I would be careful, because the regulator on the board can get hot. Safe pin current is 20mA, at 40mA they can drop. If you lack electricity, you can always use an additional power supply :) In fact, instead of risking it, it is better to have additional power for larger projects.
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  • #6 14136068
    quadrox31
    Level 9  
    thanks for the answers :) this explains a lot, but as I wrote, it needs to power systems with a total consumption of 150 - 180mA from the 5A pin, so it should be ok

    Regards
  • #7 14136875
    piotrva
    VIP Meritorious for electroda.pl  
    I would like to add that a lot depends on having the original or cloned plate - sometimes Chinese clones have VIN stabilizers -> 5V with a capacity lower than 500mA, so you have to be careful and it is best to decipher what kind of stabilizer we have and look at the catalog note.
  • #8 14139994
    dondu
    Moderator on vacation ...  
    quadrox31 wrote:
    ... this explains a lot, but as I wrote before, it needs to power systems with a total consumption of 150 - 180mA from pin 5A , ...

    Pin 5A or A5?
    I am asking because it is important, and I do not see 5A on the board: http://arduino.cc/en/Main/arduinoBoardUno

    If from A5, then you cannot get such electricity because it has much smaller possibilities:
    http://mikrokontrolery.blogspot.com/2011/03/datasheet-mikrokontroler-prady-pinow.html
  • #9 14140077
    vonar
    Level 28  
    dondu it's just a typo; it was about 5V, not 5A ...
  • #10 14141124
    quadrox31
    Level 9  
    As the previous speaker mentioned - it was a simple typo, of course it was about 5V :) and yes, I will not get such a current from pin A5.

    After some minor modifications, it turned out that the current intensity I need is no less and no more than 226mA :) so according to earlier information, you should be able to squeeze such an ampere

    I am bad at these blocks, but from what I understood it should be fine with favorable winds.

    Dondu - thank you very much for the link, extremely useful :)
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Topic summary

The discussion centers around the current capacity of the Arduino Uno's 5V output. Users inquire about the maximum current that can be drawn from the board, particularly when powering multiple components, including a sensor (100 mA), a flow meter (15 mA), and a motor controller (36 mA). Responses indicate that when powered via USB, the board can supply a maximum of 500 mA, while using an external power supply can allow for up to 800 mA, though caution is advised due to potential overheating of the voltage regulator. It is noted that the safe current for individual pins is 20 mA, with a maximum of 40 mA before voltage drop occurs. The discussion also highlights the variability in current capacity between original and cloned Arduino boards, with clones potentially having lower output capabilities. The user confirms that their total consumption of 226 mA should be manageable under optimal conditions.
Summary generated by the language model.
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