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Member Since 22 Oct 2012
Offline Last Active May 28 2014 03:41 PM

Topics I've Started

For slow digital circuits, do I need ground between each wire?

20 May 2014 - 06:06 PM

I'm designing a pass-through circuit for a project at work, and I'm running in to space issues. I have a block of thirteen digital signals and I'm wondering if I need a ground wire between each. The ribbon from my circuit to the next board is maybe 6 inches, and the signals are 0-5V logic that change states maybe once per minute. Seriously slow.

Do I really need to ground every other conductor in this case?

VS2013 support?

23 October 2013 - 06:46 PM

On October 31, VS2013 will be released. It's currently out as an RC, and I'm downloading/installing it now.


Is there any news on VS2013 support for the Netduino?

Building a "valley detector"

24 June 2013 - 09:24 PM

[color=rgb(102,102,102);font-family:'Lucida Grande', Lucida, Verdana, sans-serif;font-size:13px;background-color:rgb(245,245,245);]Does anyone know a good op-amp implementation of a "Valley Detector", which I assume would be what one calls the opposite of a peak detector? I need to find the baseline of a signal so I can reject it. I want to do an op-amp circuit instead of with a DAQ so I can do it in real time.[/color]

[color=rgb(102,102,102);font-family:'Lucida Grande', Lucida, Verdana, sans-serif;font-size:13px;background-color:rgb(245,245,245);]I'm dealing with DC signals, if that makes a difference. The "valley" is a positive nonzero voltage.[/color]

Alternative to NFC tags?

17 June 2013 - 03:37 PM

Hi all,


I had a fun idea that would add a little flair to a project I'm working on. I do instrument development for a climate research group and I'm building a networked array of instruments (using Netduino!) that communicate with various wireless protocols (WiFi, cellular networks, etc). That's easy enough, but what I want to do is write an android app to allow our field engineers to be able to use NFC communication to receive real-time data from the instruments to their phones and tablets. Previously I was just using QR codes to let the engineers connect to the webserver and automatically navigate to the relevant instrument's page, but in the case of a network failure I want the instruments to still be serviceable.


I like the idea of NFC, but I can't output data over an NFC tag without an NFC programmer of some sort. I found this:



I'm wondering if anyone has enough information on NFC to tell me if I can use Netduino to interface with this to produce a constant stream of NFC data that I can recover with a smartphone.


Or would Bluetooth be better?

Power supply specifies minimum output voltage?

05 June 2013 - 05:56 PM

I've got a Rosewill PS and the datasheet specifies that the 3.3V bus has a minimum output current of 1A. I've never seen a minimum current output specified before. Does this mean that the PS will push a minimum of 1A, regardless of the current needed by the load?

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