How to compute the power need to prototype using arduino?
How to know the voltage an apms needed to supply the prototype?
look at each individual component and what power is needed by that component. Sum all the powers and take some more just to be on the safe side
Data sheets are great, they give you that information generally on the first or last few pages. I then set my supply for 120% of that total.
I have a total power of 15.9 W, and I dont know what power supply to buy? Do you know what is best power supply?
Can you suggest the best power supply?
Standard power supplies are "constant voltage". (1) The amount of current depends on the load (Ohm's Law).
The power supply can be rated for higher current than is needed, and in fact it's good practice to allow some safety margin so you don't over-stress the power supply.
For example, a car battery is capable of hundreds of Amps, but you connect a regular little LED with the appropriate current-limiting resistor you'll get about 20 milliamps.
Power (Wattage) is calculated as Voltage x Current. i.e. 15.9W at 5V is 3.18A, so if you need a 5V power supply it should rated for more than 3A.
(1) Special LED power supplies are constant current or "controlled current".
If you are looking for a good brand for your power supply, I like MeanWelll.
Is 12V and 5amps power supply is good for 15.9 W?
Can I use 12V and 5amps adapter and use 5V stepdown ?
Do any of you prototype devices need 12V?
No, all of components are 5V - 5.5V
Then why buy a 12V supply?
15.9W/5V = 3.18A. So buy a 5V, 4A to 5A supply.
But, I am planning to use a 5V stepdown.
This, I am planning to use this.
https://images.app.goo.gl/yHboYsPBc3Hq4E8B9
Then a 12V 2A supply would be enough.
Okay, thanks.
This will help you with your calculations: Ohms Law Calculator
Can I ask a question, not related to this topic?
usually it's better to create one topic per question unless the context in this post helps for your question.
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