Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
NYCResistor:Microcontrollers
Home
+ new post
About this group
Join this group
Message from discussion Powering a GSM cellular shield
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
michael lowry  
View profile  
 More options Dec 13 2011, 10:52 am
From: michael lowry <m...@njit.edu>
Date: Tue, 13 Dec 2011 10:52:18 -0500
Local: Tues, Dec 13 2011 10:52 am
Subject: Re: [NYCR:Microcontrollers] Powering a GSM cellular shield
Print | View thread | Show original | Report this message | Find messages by this author

If your application has a GSM cellular shield, are you planning on having
it be mobile? in which case, the wall wart method will only serve you
sitting in one place, and not on the go.

As far as the Arduino power selection, it depends on the model board you
have. The newer Uno boards i know for sure select the power source
automatically, and don't skip a beat when, for example, a USB cable is
powering it and you plug a battery into the barrel jack and then remove the
USB cable (and vice versa). (Older boards may have a movable jumper to
select USB or External power.)

I see on the sparkfun site that the shield itself has a dedicated voltage
regulator (SPX29302). Before considering an additional regulator, take a
look to see if this regulator simply takes the Vin from whatever battery
and modifies it. (Schematic:
http://www.sparkfun.com/datasheets/DevTools/Arduino/cellular%20shield...).
If
this is the case, then maybe all you need is a battery with enough mAH to
supply the peak loads.

On Tue, Dec 13, 2011 at 10:19 AM, Guan Yang <g...@yang.dk> wrote:
> On Tuesday, December 13, 2011 at 10:15 , c f wrote:
> > If you are powering the GSM module from the arduino's onboard regulator
> chip, it probably can't actually source 2A. In that case, you would need to
> make sure that the GSM module does not share a "V_in" with the arduino
> (even though they do still need to share a ground wire), and that it is
> powered by another, dedicated voltage regulator that can supply enough
> current. Many voltage regulator chips are available that you could hook up
> to a wall supply to power the GSM module.

> What exactly happens if you take an Arduino (without any shields) and plug
> in both a 9V wall wart and a USB cable? Are the 5V from USB and the 5V side
> of the regular just tied together? Is there a switch ensuring that only one
> power source is used?

> --
> You received this message because you are subscribed to the Google Groups
> "NYCResistor:Microcontrollers" group.
> To post to this group, send email to
> nycresistormicrocontrollers@googlegroups.com.
> To unsubscribe from this group, send email to
> nycresistormicrocontrollers+unsubscribe@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/nycresistormicrocontrollers?hl=en.

--

Michael Lowry
Research Assistant

NYU Minimally Invasive Surgery Lab

423 E 23rd Street, New York, NY 10010

Office: (212) 686-7500 X6441
Cell: (201) 787-8633

m...@njit.edu


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2013 Google