What power supply would work with these components?

Using Arduino Project Guidance
1

What is a possible power supply for my Arduino Uno with these components

2

I would select a 12 volt power supply from 10 Amps or more.

3

Seems a little high, how about a 12V 3A supply. (2 pumps 0.6A, 4 solenoids 1.2A = 1.8A)

4

I really don't agree. The 2 pumps, started at the same time could shortly easily consume 6 Amps together.

5

Ok start up current. Still may be cheaper and lighter to just code it so that does not happen.

6

That's a possibility. However the costs for a standard 10 Amp supply does not motivate any such low amp supply.

7

Let's look at the loads.
a DC motor will draw, maybe 125% of rating on start. so 300*1.25 = 373
two motors, if they started at the same time could draw about 750mA for an instant when started. then drop to 600 for running.
3 coils don't have an inrush so run at 300 all the time they are energized.

so, 900 +750 = say, 1,650mA
next, we assume that the translation from Chinese of 2 to englis is double.

therefore a transformer rated for 2 amps, has a label in english that is doubled, so it would read 4.

back to the problem.
1,650 translated would mean we would need to get a transformer listed a 3,300.
so the correct answer is 3 amp

but, there's more.
if the device is operating, that means, ( in engineering parlance) that there are not enough features yet. so, we would look at the project, lights, relays, buzzers, and such and add some extra capacity.

so, back to the question.
if you have it working and space is a huge concern you certainly get by with a 2 amp power supply.
For long term use, add a large capacitor to account for the surge and get a 2 amp power supply.
For that sleep with no concerns result, get that 3 amp.
if both money and space are of no concern, go full 'Merican and buy the largest one you can get.

Aliexpress, first site, free shipping
12v, 2A - $3.06
12V, 3A - $4.36
12V, 5A - $8.09
12V, 10A - $14.78

8

I've not run into such a conversion before. Or are you just adding in a safety factor?

As I mentioned in a previous post, I would not buy or recommend anyone purchasing a non UL rated supply from a non known mfg. I like Meanwell supplies they have a good reputation and are UL approved (not just stamped on the case, real approval). But there are many others.

Go google "teardown of Chinese power supply" You will find dangerous ones, many that do not meet their specifications etc. It I was using a cheap 12V to 5V converter then it wouldn't be so bad, but plugging one into mains where one of my family might touch it at the wrong time is not an acceptable risk for a few $$.

9

"Chinese Amps"?

Similar to the traditional "internet inches" on some sites which appear to be about 12 mm long. :rofl:

10

As you move up in power, the manufacture can double profits by printing a label.

you are correct in that some manufactures find it just as easy, and even more profitable to make quality products.

your comment about buyer-beware is very true.

Many of us on here have found that power ratings are not to be trusted.
so, my humor about translation is from my own, and others shared experiences.

Here in the States, our National Electric Code says you cannot design a circuit for more than 80% of it's rating.

Most of us use that as a general rule.
so the max listed rating of the OP's project, 5 loads, 300mA each is 1,500 mA. if we toss in the current spike for DC motors we are at about 1,600 mA or 80% of a 2 amp supply. 50% of a 3 amp supply.

If there was room, I'd spend the extra and get a 3 amp supply, but if I had a 2 Amp handy, I would use that.

In the decision process, how critical is the operation ? I would buy a MeanWell, 3 amp if it were critical or for others.

as for fingers, I put most everything inside of enclosures.

1 Like
11

Is this about the remote controlled vibrator again? :crazy_face:

12

There may be some connection, indeed! :ok_hand:

13

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