Hello, I have a small question.
I would like to power an Arduino through the VIN pin using a transformer to convert AC to DC, providing a voltage of 24V and a maximum output of 5A, the output of the transformer will be reduced to 12V with a maximum output of 5A using a voltage regulator and that's will be the voltage and the maximum A for the arduino. Is the voltage and current output too high? Another important aspect is that I will power all the other components separately from the Arduino, including 3-5 sensors, 5 fans, an LCD display, a keypad, a mini water pump, etc.
Is it a UNO R4, or an R3 (or earlier)? They are very different.
What do the specifications for your UNO tell you?
Note that the Arduino (like any other load) will only ever draw as much current as it needs - the power supply can't "push" more current into it than it needs.
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It’s an arduino uno R3
Then the specifications are here:
The voltage should be ok if you use the VIN pin.
I personally don’t think/know if the onboard regulator is very efficient.
The fans, pump and LCD will probably draw the most power.
"transformer to convert AC to DC" This is impossible as transformers are AC only devices. The output of the transformer will need to be rectified (converted to DC) then smoothed out and regulated.
Why do you want 24V? Why not simply buy a 12V power supply (if you need 24 a 24V power supply would work). and a few buck regulators. Set one for about 7.5 volts for Vin. The other to 5V for the other hardware. Connect all the grounds to the power supply. Voltage regulators would work but you will have a large heatsink as they are not very efficient. Buck converters are much more efficient and do not cost much more. I always use Vin because of the additional filtering and protection it gives me.
I suggest you make a block diagram and connect each item with a line and not what voltage and power it needs. This will give you a good start on a design.
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It's just a linear regulator:
so not at all efficient!
The higher the VIN voltage, the less efficient it gets!
@george2707 for this reason, it might be better for you to regulate to a lower voltage...
As @gilshultz said, why did you choose 24V? and why 12V?
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Or another solution is that I can use a cable with a barrel plug that I will connect to my 12V source to the normal power source of arduino?
Because I can't find a 12V power supply at the moment with a fair price for my bachelor's degree project (an automatic micro greenhouse), the only good option is the 24V supply, which can provide me with 5A. I will use two regulators to obtain 12V and 5V, and I have found an old cable with a barrel plug that I will use to power my Arduino by connecting the cable to the 12V output.
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