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There have been 155 items by Michel Trahan (Search limited from 10-July 24)

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#12529 Double prescision math lib?

Posted by Michel Trahan on 27 April 2011 - 11:52 AM in Netduino 2 (and Netduino 1)

I posted firmware builds of my math library to the forums. There seemed to be a huge lack of interest so I did not pursue it any further.

That was before I got a netduino

It would be useful to have one ...

#12623 Double prescision math lib?

Posted by Michel Trahan on 28 April 2011 - 11:18 PM in Netduino 2 (and Netduino 1)

I will have to see if I can get a build cooked up for you. Which Netduino do you have?

Normal Netduino for me ! Will need the Netduino plus to test it live with the webserver app that Mario put on the forums that I need to modify for this purpose

(Thanks Mario)

#12483 Best way to convert string to number

Posted by Michel Trahan on 25 April 2011 - 03:28 PM in Visual Studio

using System; ActualReading = Convert.ToUInt16(sActualReading);

#11521 Recommend a scope or PC card for working with Netduino?

Posted by Michel Trahan on 31 March 2011 - 01:11 PM in General Discussion

Hesitating between these two : Saleae or DSO 2090 USB PC USB Oscilloscope 40MHz 100MSa/s 2CH Picoscope are way out of my budget (which is between 150 and 250, tax and shipping included)

#12268 High Speed Photography

Posted by Michel Trahan on 20 April 2011 - 04:25 AM in General Discussion

30fps is about 33ms ... do you have access to the ccd through i2c or serial ? what is the throuhgput available from the netduino compatible camera ? links please

#12580 High Speed Photography

Posted by Michel Trahan on 28 April 2011 - 01:20 PM in General Discussion

Did you remember the "ancient" PC-XT @ 4.77MHz, with 640K ram???

Hey, I bought a co-processor for one of those to make my galaxy creation simulation work in a week instead of a month

However, there are many friends that don't know how to build even a simple circuit with a 555.

I'll have to learn about those

Secondly, perhaps they are attracted by this board and would build a very simple application.

Yeap, that is me, simply learning .net in an interesting way (.net in all forms, normal, phone and MF, cool and having fun)

Thirdly, such a context is very useful because it shows clearly some lacks of a Netduino/MF board.

This is the goal of this experiment. Find out what works and what is missing, all for the ease of programming whatever we get our hands on

I'm looking at a 3D Printer right now and it is because I played with a netduino that I might have on in a few months

It is not a problem of our lack of knowledge about what to use when ... it is a question of finding out how we can adapt our tools to help even more

I Love This Community (ILTC)

#13238 PanAndTilt

Posted by Michel Trahan on 13 May 2011 - 04:20 PM in Project Showcase

Thanks Michel for the heads-up.

No thanks needed, I'm much of a newbie too so ... just saw the diagram and got shivers ... lol

#13234 PanAndTilt

Posted by Michel Trahan on 13 May 2011 - 02:55 PM in Project Showcase

I thought we should never connect motors directly to the netduinos because of spikes ... just a thought !

#13204 Analog input varying too much on temp sensor (LM335A)

Posted by Michel Trahan on 13 May 2011 - 12:24 AM in General Discussion

Please note that the analog-digital converter on the Netduino is 10-bit, but it is not uncommon to lose 1- or 2-bits of accuracy with integrated microcontroller ADCs (for a variance of 2-4 on the 0-1023 scale).

I have been trying to get stable data from a LM335A Temperature sensor and I do get a variation of 3 to 4 out of 1023. You say this is normal ? When I look at the oscilloscope data, it is quite stable (better using 10 pF capacitor) but still a variance of 3 to 4 ... you say this is normal ? The variation on the oscilloscope is does not even equate 2 out of 1023 so why more variance ?

A variance of 3 would make sense since the LM335A Temperature sensor is 1C accuracy which equates to 3 out of 1023, therefore a variance of 3 would be exactly the accuracy of the sensor. Am I making sense here ? But the oscilloscope seems to be more stable than what the Analog pin gives out ... why would that be ? The voltage to be read is more stable than the values obtained by the analog pin reading ... why ?

I use 3.3V with a 300 Ohm resistor and a 10 pF capacitor.

I did see that I have 3.250 instead of 3.3 when I put the oscilloscope on the power thread on the breadboard ... why I do not know ... shouldn't be 3.3 ? (was using USB power)

#12696 Any help on a ParallelIn SerialOut Bitshifter?

Posted by Michel Trahan on 30 April 2011 - 04:02 PM in Netduino 2 (and Netduino 1)

Hi Stefan, I looked at your code for bitshifter ... cool

How can we integrate it with microliquidcrystal lcd class ? It is a question of integrating a new transport but I don't know how to do that lol And did I see correctly, you re-read all pins for each pin status read ? wonder why ! Keep the good work ! Check this link : http://geekswithblog...id_crystal.aspx A sample with connections and code would be cool ! Mike.

#12707 Any help on a ParallelIn SerialOut Bitshifter?

Posted by Michel Trahan on 30 April 2011 - 09:07 PM in Netduino 2 (and Netduino 1)

Remember I gave you that link in chat once?

LoL me and my short term memory ...

#13149 Netduino/Android - is it possible

Posted by Michel Trahan on 12 May 2011 - 12:37 AM in General Discussion

You can already use your Windows Phone to control a Netduino Plus-based accessory via WiFi.

Can you point at code 'cause I would like to know how to do just that

Please ? I know, off topic since mainly phone Wifi coding ... but a link would be very much appreciated

#13169 Netduino/Android - is it possible

Posted by Michel Trahan on 12 May 2011 - 12:38 PM in General Discussion

Thanks, I'll look into it

#12335 Making the Netduino a little bit closer to a RTOS device

Posted by Michel Trahan on 21 April 2011 - 11:21 AM in General Discussion

calls to native methods are blocking, so the execution engine has to wait until the native method finishes.

That made me think about how we used to do sampling of brainwaves for consciousness detection under anaesthesia. First capture data and nothing else, then massage it (cumulate to get base wave, filter the 60hz that is everywhere, etc...). Since it is blocking, does it gives you full access to the mcu ? for only one process : capture data. That would be perfect.

So, correct me if I'm wrong, native code would allow you to stop everything else (gc included?) to capture clean data (maximum time allowed ?) and then back to managed code for ease of programming and analysis. I want one

you could load FreeRTOS on your Netduino...

That would be an interesting tutorial for advanced users

and what is the language used in FreeRTOS ?
I'll check, thanks for posting

#12336 MotorShield driver

Posted by Michel Trahan on 21 April 2011 - 11:36 AM in Netduino 2 (and Netduino 1)

Hi Guys and Girls,

Girls ? Where ?

Currently I have a successful Netduino driver for this shield: Arduino Motor Shield (L298N).

Cool, I'll want one when budget will allow

I know it is a stupid question with you since you will ... but can you add it to the sandbox wiki ?

MotorShield.SetState(Motors.Motor1, Directions.Backward, 100);
MotorShield.SetState(Motors.Motor2, Directions.Forward, 50);

I vote for this one, you can easily read the purpose of the code

that could be quite some overhead on code memory.

I vote for not adding all those overloads ... no overlords please

(pun intended)

#13148 Little Tutorial on the NetduinoMini and XBee Connections

Posted by Michel Trahan on 12 May 2011 - 12:30 AM in Netduino Mini

Thanks

#12465 Speaker class and Netduino Keyboard

Posted by Michel Trahan on 24 April 2011 - 02:51 PM in Project Showcase

You have cool friends

#12008 Cosine function

Posted by Michel Trahan on 12 April 2011 - 01:10 PM in General Discussion

could you manage any way to cut-off the original MF math and insert the ours?

Or simply giving it to Microsoft to include in the .net mf framework ? Solving the problem, not patching it ?
Just a thought

And as a physicist ... I want a real math library ...

#12244 C# Coding standards

Posted by Michel Trahan on 19 April 2011 - 04:15 PM in General Discussion

You may wish to read http://www.joelonsof...cles/Wrong.html where Joel Spolsky talks about the difference between Apps Hungarian and Systems Hungarian. (Scroll to to the bottom of the post to find it).

I believe Apps Hungarian is extremely useful, but quite frankly today with managed code Systems Hungarian has lost much of its usefulness.

Wow ! I was doing it all wrong LOL ! I was mixing up both System and Apps Hungarian, and prefering the Apps one but tried to continue on the System one too and hating it ... been off programming for 7 years ... thanks, now I know what to do, keep the good and throw the bad and ugly system hungarian from my habits

A big thanks for the article you point at ! Boy do I love it here, I learn so much !

#12233 C# Coding standards

Posted by Michel Trahan on 19 April 2011 - 12:43 PM in General Discussion

I came across this blog post with a nice set of C# coding standards at http://weblogs.asp.n...s-document.aspx

Will be looking at it to add some Coding Standards to my Netduino Tutorial

If I can get at it ... been trying ... ok got it

#12262 C# Coding standards

Posted by Michel Trahan on 20 April 2011 - 12:39 AM in General Discussion

code comments lie. Maybe not today, maybe not next week; but when the code is changed, the comments are almost never updated to reflect the new reality.

Got that right lol