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There have been 10 items by greg (Search limited from 11-May 23)
#18453 CANBus ...
Posted by greg on 26 September 2011 - 11:38 PM in General Discussion
#18488 CANBus ...
Posted by greg on 27 September 2011 - 12:57 PM in General Discussion
Hi Greg.
This CANBUS shield seems okay for the Netduino, since it uses the SPI.
I browsed quickly the datasheet, and it seems that there's no problems to interface.
Now, you answer me:
Cheers
- why you must use CANBUS?
- why using Netduino over Fez?
The whole point was to not have spend more than the netduino on a shield.
CANBus is required for some model railroad control bus communication.
As for Fez vs Netduino - I prefer the netduino - its open firmware vs closed.
#13303 Quadcopter Early Flight
Posted by greg on 15 May 2011 - 02:47 PM in Project Showcase
Yes you need it when you don't know C or C++ and only know Visual Studio as a compiler lol I come from VB6 ... therefore, netmf is my best bet ! And I don't want a professional quality flight control, I just want mine
By the way, my main goal is to learn .net and I decided to start with .netmf !
This community rocks !
Mike.
p.s.: You should see my smile lol
Look at it as a new opportunity to learn. Pick up a PIC or ARM or AVR and get at it. PIC and AVR is certainly easier since you don't have to write all the initialization code though.
#28143 Interesting performance thread over at TinyCLR
Posted by greg on 26 April 2012 - 02:06 PM in Netduino Go
Hi fxmaker,
One of the design goals with Netduino Go was to enable the micros on the modules to do the heavy lifting for native code. So that you can focus on command-and-control logic in your mainboard C# code. We also included a true MiniJTAG (Cortex Debug Port) connection on the mainboard so that you can mix native code into your firmware and debug using a super-inexpensive STLink/V2 JTAG debugger.
All that said, the STM32F405 micro on Netduino Go is several times faster than the 72MHz ARMv4 NXP chips. You will see quite a bit of overhead from the MSIL interpeter (running your C# code) but it should be quite a bit zippier. That chip is a monster. To be specific, 210 DMIPS plus it has a math co-proc on board.
Chris
Chris you and your STM's! Although I will agree the F4s are awesome.
BTW - a little off topic but I thought you were leaning towards the Atmel Cortex-M4, but you went with the ST? Not that I'm complaining, I really like the ST stuff.
-Greg
#13302 Netduino/Android - is it possible
Posted by greg on 15 May 2011 - 01:48 PM in General Discussion
#14615 PCB design and manufacturing
Posted by greg on 23 June 2011 - 03:10 AM in General Discussion
Batch PCB uses GoldPhoenix in China for their manufacturing. I go directly to goldphoenix as for the boards I make it turns out much cheaper ($110 US for a 10x15in panel, double sided, pth, single sided silkscreen, no limit on holes etc)
The quality of the boards is generally very good. On the last order I did (for a full panel) they actually shipped me two panels because there was a small manufacturing error on one of the boards. They do do sanity checking too, a coupelof orders ago I forgot to include my nc drill file, they contacted me back within an hour of submitting the order to confirm whether I actually did want a board with no holes
Wow thanks for the link. I like the fact that it's not per-board it's per-area. Sure, sometimes you may only want one or two boards but who couldn't use extras for a decent price? If you've got a 3x4" board they'll make you 8 of them for $100? Including shipping? That's fantastic. Love it.
Ah - the catch is no testing on 2 layer boards with a 15% fail rate. 4 layer and higher they test and have a 2% fail rate. Still, using the example above you'd have 1-2 boards fail per batch. Even with 2 failed boards you're talking about ~$18 per board. Not bad at all.
#18912 Difference between Netduino and FEZ Boards?
Posted by greg on 07 October 2011 - 06:19 PM in General Discussion
Do you have any other nice idea what could be realized with an Netduino?
I am not sure what you're getting at here. The Netduino and Fez are pretty much identical products - so whatever you can come up with you can accomplish. About the only drawback to either product is if you need absolute timing in your application. Since it's managed code you can't control that (i.e., GC will run, etc) but for 99.9% of ideas this won't be that important.
#18901 Difference between Netduino and FEZ Boards?
Posted by greg on 07 October 2011 - 12:52 PM in General Discussion
if you want your students to also read/learn from the firmware source...?
No !.
I only want to use a board like this for some simple tasks like:
- a DCF77 clock
- an electronic keylock using a matrix keyboard (3x4 keymatrix, LCD)
- a radio clock (MP3 player (VS1053B chip), radio (Silicon Labs chip), clock function, touchpanel)
- reformatting NMEA strings from a GPS receiver
Honestly either board will do that just fine. And they'll both do it in C# with Visual Studio. And the programs will both be almost identical, there will be just a couple of minor differences in how you access the board pins.
#18222 Cortex M3 Arduino
Posted by greg on 20 September 2011 - 03:06 AM in General Discussion
Hey
Was just reading this from a few years back
http://www.arduino.c...um=1227128468/0
Seemed like a more powerful processor with a less powerful set of tools than netduino. Got me wondering why netduino is ARM7 based? Can someone explain the diff between the M3 and the older ARM7?
Edit:
This seems more recent.
http://www.electroni...o-community.htm
Ta
Les
http://www.edn.com/a...3_processor.php
There are a myriad of differences. I'm a big fan of the Cortex, and I've been bugging Walker to head that way for a while.
#18223 GPRS Nanny Cam
Posted by greg on 20 September 2011 - 03:09 AM in General Discussion
http://www.sparkfun.com/products/9607
Something like this?
Speaking as a network engineer for a Very Large Wireless Company chances are you won't find this in something that you can stick on a little kid. All the consumer grade electronics are going to be bulkier. Not to mention I don't think you want to stick a LiPo battery on your kid and if you want any kind of battery life LiPo is the way to go.
Cells use a LOT of juice - and since you want to be able to log into the device that means it's going to have to be always on with a data connection running. You'll save some power by using 2G (GPRS) vs 3G (UMTS) but it's still going to require a decent battery to get any kind of life out of it.
-Greg
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