entropi's Content
There have been 5 items by entropi (Search limited from 28-April 23)
#11836 MIX11
Posted by
on 08 April 2011 - 08:12 PM
in
General Discussion
I'm heading out to MIX next week and I noticed that Chris Walker is going to be at the "Open Source Fest." Anyone else going to be out there for the conference?
It's a busy week, but if a few people were going to be around, a meetup might be worth trying to throw together.
#7472 Use of Static Keyword
Posted by
on 11 January 2011 - 09:53 PM
in
General Discussion
The link to "Designing for Class Libraries" on msdn above is a great starting point. For naming in particular, see the subsection:
http://msdn.microsof...y/ms229002.aspx
We used this as the starting point influence for our own internal coding guidelines.
#7416 LCDKeypad 16x2 HD44780 Shield
Posted by
on 10 January 2011 - 03:16 PM
in
Project Showcase
...and I suppose 1.2k/1.8k would work just as well.
#7415 LCDKeypad 16x2 HD44780 Shield
Posted by
on 10 January 2011 - 03:08 PM
in
Project Showcase
I think a voltage divider circuit is probably the way to go, and using only 2 resistors, should be the most affordable. I'm a decade or so out from that last time I used any of this EE knowledge, so hopefully I'm getting this correct (been breaking out my old circuits textbook at night to refresh my memory). Hopefully someone can chime in if I'm off on any details here...
I think using a 12k and an 18k resistor should get you the correct ratio (~1.5 ) to divide 5v down to 3.3v. With the 12k resistor in series on the analog line of the shield buttons, and then after that parallel out the 18k resistor to ground...
(Hopefully that shows up right..the 18k resistor line is split out after 12k R, before netduino in.)
I think using a 12k and an 18k resistor should get you the correct ratio (~1.5 ) to divide 5v down to 3.3v. With the 12k resistor in series on the analog line of the shield buttons, and then after that parallel out the 18k resistor to ground...
lcdboard ----> 12k R ----------> Netduino analog in
|
|
18k R
|
Ground
(Hopefully that shows up right..the 18k resistor line is split out after 12k R, before netduino in.)
#7112 USB UVC (Video) Support
Posted by
on 06 January 2011 - 02:49 AM
in
General Discussion
I picked up a netduino for my brother-in-law for Christmas and couldn't resist getting one myself. Developer by day, I haven't touched hardware since a single digital logic design class in college far too long ago...
One project idea I've been thinking about involves manipulating a webcam video feed. I get that the netduino doesn't have the kind of specs needed to handle the video itself. Instead, I was thinking of grabbing a couple cmos cameras from somewhere like sparkfun and then use the netduino to control the data flow of which one feeds into a dedicated USB controller that could handle the video-to-pc heavy lifting.
I've found references to a few dedicated ICs out there (like these) that can take the camera input and show up as a UVC USB device to avoid any extra driver install needs, but I haven't found any source for buying them (and certainly nothing affordable and ideally on a breakout board that I could play with), plus no idea of the price.
Any ideas? Is there a more general purpose MCU or other approach out there that could maybe handle this kind of thing? These are just random thoughts right now..I'm basically looking for the most straightforward way to get a video feed to show up as a webcam on a pc, with that piece not needing to be too directly tied to the netduino.
One project idea I've been thinking about involves manipulating a webcam video feed. I get that the netduino doesn't have the kind of specs needed to handle the video itself. Instead, I was thinking of grabbing a couple cmos cameras from somewhere like sparkfun and then use the netduino to control the data flow of which one feeds into a dedicated USB controller that could handle the video-to-pc heavy lifting.
I've found references to a few dedicated ICs out there (like these) that can take the camera input and show up as a UVC USB device to avoid any extra driver install needs, but I haven't found any source for buying them (and certainly nothing affordable and ideally on a breakout board that I could play with), plus no idea of the price.
Any ideas? Is there a more general purpose MCU or other approach out there that could maybe handle this kind of thing? These are just random thoughts right now..I'm basically looking for the most straightforward way to get a video feed to show up as a webcam on a pc, with that piece not needing to be too directly tied to the netduino.
