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Unread 15-01-2014, 12:29
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Re: Powering Arduino

We have used this module from Sparkfun for 12V->5V for our Arduino and LEDs..
https://www.sparkfun.com/products/9370

You need to calculate the value of an external resistor for your output voltage (check the datasheet), but it's easy to use and a high current rating. May need active cooling depending on the current you draw - it does get pretty warm with our LEDs.
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Unread 15-01-2014, 13:09
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Re: Powering Arduino

Quote:
Originally Posted by sst.thad View Post
I don't have the schematics in front of me right now, but I believe the Analog Breakout can source about 1A, which is defiantly enough to power an Arduino. Because most analog circuits won't source much, you should have alot of that power free.
There are three versions of the Analog Breakout. The 2009 version can supply 3 amps and uses a switching regulator. The 2010-2013 version uses a linear regulator and can supply 0.25 amps continuously. The 2014 version also uses a linear regulator and can supply 0.25 amps continuously (and doesn't require the battery voltage jumper to comply with R70).
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Unread 15-01-2014, 13:33
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Re: Powering Arduino

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Originally Posted by amesmich View Post
I have used these in many other projects to regulate 24vdc down to 12v for an arduino (among other things) and they work great. Yes you can give the arduino 24v and it will be ok but I dont like to stress the VR on the arduino that much.

http://www.amazon.com/RioRand-LM2596...c+power+module


Thanks for the link, I think we will give these a try.

Randy
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Unread 15-01-2014, 14:08
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Re: Powering Arduino

Quote:
Originally Posted by steinra View Post
It is more for the 12v than the 5v, but to allow for the voltage drops in the battery supply side under heavy drive load (see supply drops to 9v/10v during heavy acceleration / motor use). Mainly to avoid brown out conditions for devices that need that stable higher voltage.
If you just need a regulated 12v supply, you can buy a single buck/boost supply that outputs 12v and has a wide input range. Then there's no need chain a bunch of regulators together. I don't know what your current requirements are, that will be driving your purchase.

This one on amazon says it can output 2A @ 12V with no heatsink. Could wire directly into the PDB connections off a breaker.

These things all come out of china, so if you can deal with waiting a few weeks for shipping, you can check ebay for better prices and a wider array of parts/suppliers to choose from.
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Unread 15-01-2014, 14:16
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Re: Powering Arduino

Randy,
The power supplies on the PD are designed with brownout in mind. They continue to put out down to at least 5 volts but typical is 4.5 volts. The cRio is only available in a 24 volt version as this is a standard industrial power supply. It actually has a wide voltage rating, 19-28 v as I remember.
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Unread 13-03-2014, 18:37
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Re: Powering Arduino

Hi,
Does anyone know if we can use a second KoP 12V/5V DC-DC converter off a normal port on the pdb to power the arduino?
Are there any rules against using a second one of the KoP DC-DC converters?

Thanks
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Unread 14-03-2014, 07:29
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Re: Powering Arduino

There are no rules to prevent this use.
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Unread 14-03-2014, 09:29
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Re: Powering Arduino

When we used Raspberry Pi's last year we bought a second power supply that is used for the wireless router. It gives a solid 5v under extreme conditions, hence the reason it is required for the radio. Of course you would need to power it off of the PD through a 20A breaker since it is a custom circuit. It worked great for us, but did raise some questions since there were 2 and 1 of them was plugged in to a 20A breaker. Just know the rules and be able to explain why you did it the way you did it and the inspectors will pass it.
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  #24   Spotlight this post!  
Unread 14-03-2014, 11:32
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Re: Powering Arduino

Quote:
Originally Posted by fsgond View Post
When we used Raspberry Pi's last year we bought a second power supply that is used for the wireless router. It gives a solid 5v under extreme conditions, hence the reason it is required for the radio. Of course you would need to power it off of the PD through a 20A breaker since it is a custom circuit. It worked great for us, but did raise some questions since there were 2 and 1 of them was plugged in to a 20A breaker. Just know the rules and be able to explain why you did it the way you did it and the inspectors will pass it.
You don't HAVE to use a 20A breaker for a custom circuit. R46 states that you can use UP to a 40A breaker for custom circuits. In fact, a 5A breaker would be just fine.
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