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Topic: Power supply for arduino and several boards using one adapter (Read 716 times) previous topic - next topic

caliph

Good morning !

I have a project that involves 3 boards and I want to power them up using a single power source (that I will buy, dont have it yet):

1) Arduino Uno: 6-12 Volt recommended, lets say 250mA
2) GSM modem board, 5V, 2A in peaks (!)
3) Raspberry pi, 5V, 1A

It there a way to power them all using one adapter?
And is there a ready to buy solution to take care of the voltage difference for the Arduino?

Whats your experience?

michael_x

When you have a stable solution for 2) and 3), you can easily feed the Arduino from their 5V too.

majenko

Best bet for that amount of current draw is a small ATX power supply.  The kind of thing you find in small 1U servers.

caliph

Ok, I realiseI  can use 5v external supply for the Arduino as well. I was reading about the recommended 6v-12v.
Ok then I have no problem:)

As for the adapter I will use a normal one:
e.g. in UK
http://www.amazon.co.uk/LINDY-2-5mm-Country-Switching-Adapter/dp/B005NF4C7O/ref=sr_1_9?ie=UTF8&qid=1343918592&sr=8-9

I believe this to be sufficient, because all current numbers are for peak levels. So I am 250 mA short if all boards peak at the same time. I will give it a try.

majenko

You should be ok, the Pi is only around 750mA, not 1A, so that covers your extra 250mA.

Of course, the power supply is cheaper if you go direct to Lindy, but then you have to have a trade account with them :P

majenko

Of course, this is cheaper, and gives you an extra 600mA headroom:

http://www.rapidonline.com/Electrical-Power/Stontronics-5V-3-6A-15W-Desktop-Switch-Mode-Power-Supply-Unit-T3321ST-90-2595

You have delivery on top though unless you get past their minimum order level for free delivery.

michael_x

I don't see the extra 600 mA :

From their specs:
Quote
can provide up to 15W


This is max 3A @ 5V .   You won't really benefit from a drop to 4V when taking 3.6A ( before it completely switches off ? )
I guess they're pretty similar.

majenko

They're Japanese watts.  Japanese watts are more powerful than western ones.

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