This looks really cool.

Could 4 sensors be connected to a single Netduino Plus 2? I am thinking of using a set to collect simultaneous data at the same time; 4 are lined up within 1" of each other, pointing at the sky, and when something rolls over each one, the Datetime could be saved/displayed for each acquisition.

I have seen "premium jumper wires" on several online stores, none seem to e longer than 300cm / 12in. Why is that? Power loss? Potential for signal interference? Thanks.

When I need something "long" (eg 48 inches), would it be ok to use a piece of shielded Ethernet cable, or would that add additional complexity to the job of just making a sound connection? Thanks.

Hi Donovan. Both that part and then one at https://www.sparkfun.com/products/9568 seem to require 5V. How did you deal with that?

Thanks.

@qsnapper, thanks for providing input. I was unable to get that to work with my configuration for some reason. I did not have the right reference assemblies loaded up to get those WebClient bits to work.

 

I used  Toolbox.NETMF.NET.HTTP_Client this way:

 var httpClient = new HTTP_Client( new IntegratedSocket( _remoteCollectionSite, 80 ) );                fullUri = _remoteCollectionPath + _paramBuilder.ToString();                HTTP_Client.HTTP_Response httpResponse = httpClient.Get( fullUri  );                Debug.Print( _remoteCollectionSite + fullUri );                Debug.Print( httpResponse.ToString() + "n");

However, if the remote server is not available the exception that comes from a timeout is not easy to trap. I might be having a problem with how Exceptions are caught in my catch{} block because I never get details as I am used to when creating .NET (non Micro) Framework software.

 

Thanks.

There is a remote web server waiting to accept simple HTTP GET traffic and I want to make calls to it from my Netduino Plus 2. I am familar with using WebClient in the .NET Framework, but do not see anything comparable for the Micro Framework.

 

What is the proper way to just send a GET from a Netduino? I just want to send stuff like

 

http://192.168.1.1/g...a=1&b=2&c=3&d=4

 

from the Netduino to my remote web server.

 

 

Thanks

 

.

Chris, thanks for taking a look at this. I am putting in a big chunk of the program in the hopes that you can help me think though the right way to do eventing. This is code for a model car race track; a switch is closed and a race starts, when a car passes over a light sensor the time is logged, and if nothing happens in 10 seconds then the time is logged anyway and then a new race heat can begin.

// extraneous code removedpublic class Program{    private static InterruptPort _laneSensor = null;    private static InterruptPort _buttonOnboard ;    private static InterruptPort _gateSwitch = null;    private static Timer _heatTimer;   	 public static void Main()        {            OnboardHardwarePrep();            SensorsReset();            StartGateSwitchPrep();            TimeContainerPrep();            Thread.Sleep( Timeout.Infinite );        }                private static void OnboardHardwarePrep()        {            _ledOnboard = new OutputPort( Pins.ONBOARD_LED, false );            _buttonOnboard =                new InterruptPort ( Pins.ONBOARD_SW1, true , Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeBoth );            _buttonOnboard.OnInterrupt += new NativeEventHandler ( buttonOnboard_Fire );            _ledOnboard.Write ( false );        }                            private static void SensorsReset()        {            try            {                _laneSensor = new InterruptPort( Pins.GPIO_PIN_A1, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeBoth );                _laneSensor.OnInterrupt += new NativeEventHandler( laneSensor_Fire );            }            catch (Exception xxx)            {                Debug.Print( xxx.ToString() );                // Why do I only get the text "System.Exception" and not rich problem info?            }        }                private static void StartGateSwitchPrep()        {            _gateSwitch = new InterruptPort( Pins.GPIO_PIN_D12, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeBoth );            _gateSwitch.OnInterrupt += new NativeEventHandler( gateSwitch_Fire );        }                        static void gateSwitch_Fire( uint data1, uint data2, DateTime time )        {            RaceHeatBegin();        }                            static void RaceHeatBegin()        {            _ledOnboard.Write( true );            TimerCallback timerCallback = new TimerCallback( Tick );            _heatTimer = new Timer( timerCallback , null , 9999 , 9999 );            _laneTimeBegin = Utility.GetMachineTime().Ticks;            _ledOnboard.Write( false );        }                                static public void Tick( Object stateInfo )        {            Debug.Print( "Timer elapsed for the heat (9.999 seconds)." );            buttonOnboard_Fire( 0, 0, DateTime.Now );        }                static void buttonOnboard_Fire( uint data1, uint data2, DateTime time )	    {            try            {                if (null != _heatTimer)                {                    _heatTimer.Dispose();                }            }            catch (Exception xxx)            {                Debug.Print( xxx.Message );            }            TimingLog();            _ledOnboard.Write ( false );       		 }	   	             private static void MessagePrint( string messageToSay )        {            Debug.Print( messageToSay );            buttonOnboard_Fire( 0, 0, DateTime.Now );        }                        static void laneSensor_Fire( uint data1, uint data2, DateTime time )        {            _laneSensor.OnInterrupt -= laneSensor_Fire;            _laneTimesEnd[1] = Utility.GetMachineTime().Ticks;            MessagePrint( "Lane 1 : " + _laneTimesEnd[1] );        }            }

Also, the Micro Framework appears to throw and Exception if a property is assigned to an Interrupt port more than once (a tactic I tried in order to "reset" the hardware). Is that as-designed behavior?

 

Thanks.

Hey All. I have a Netduino Plus 2 with a Sparkfun photocell sensor wired up to Analog1 with a 10k resistor in the mix (equivalent to what you see in http://bildr.org/201...sistor-arduino/).

 

In my program.cs, I can drop a breakpoint at the event that is fired when the interrupt occurs, and after the first time the sensor interrupt occurs, the event is fired "forever", it does not ever stop.

 

After the event fires, I am logging the datetime ticks that the event happened, but then I do not want the event to fire again.

 

What is the proper programming pattern to accept the interrupt/event one time?

 

 

Thanks.

 

 

 

 

 

For this kind of derby race, cars run on top of wood guides. My plan was to drill small holes in a section of the track (image shows pink dots where holes could go), place the sensors there, and detect the shadow of the car as it passes over the holes. The crowd watching the race does not have an obscured view of the finish line. Cars have strict requirements about weight and dimensions and add-ons, so they cannot have anything added to them like reflective tape.There is approximately 3mm between the bottom of the car and the wood guide, so my plan was to drill small holes in each slot, embed the sensor in the hole, and run wiring though the hole and under the bottom of the track.

 

I thought that a light sensor would fit these requirements the best, detect when a shadow is cast over a sensor and mark the time.

 

As you can see, I am now having trouble with the detection part....

 

If I went with https://www.sparkfun.com/products/246 , what other hardware would I need to go with it? The video at seems to indicate it can accurately/quickly detect the difference between light and shadow.

 

I am also looking through stuff at Mouser (http://www.mouser.co...nsistor&FS=True) to get more clue.

 

All newbie help is very much appreciated!

 

Thanks.

I am still digging....

 

I saw this tutorial : http://bildr.org/201...ensors-arduino/ and it is leading me to believe that I can get this to work:

 

https://www.sparkfun.com/products/246

 

the same as this :

 

http://www.mouser.co...pb%2bGHLi3qmps=

 

Is that true? The track is running indoors in a US school gymnasium (lights are fluorescent and 15+ meters in the air) so I think there should be no IR interference.

 

All comments welcomed, I don't want to buy the wrong sensors twice! 

  Personally, I would use a photo-transistor instead, it is easier to use and it will work much better.  

 

Thanks for the detailed response. I have re-evaluated what I am trying to do... And now am shopping for "photo transistors". My typical part suppliers have been Adafruit and Sparkfun, neither of which appears to carry what you are talking about. Do you have a vendor recommendation?

 

 

Thanks!

...bump...

 

Anyone?

Take a look at the link you posted. VS 2013 is there. VS 2012 updates are there. VS 2012 Express edition for Windows Desktop is not there.

This is a problem for me because I just re-paved my laptop and now cannot seem to get a decent download link for VS 2012 Express, only 2013. Not good to keep this stuff out of sync...

Like many other newbies/lightweights, I looked around for something permanent-ish to hold my Netduino ][+ with an LCD and/or other gadgets. I followed a link to http://www.thingiverse.com/thing:48939 and uploaded it to www.sculpteo.com, who quoted me ~$80. When an open holder costs more than my device, I am sure I am doing something wrong.

 

So.... Can anyone recommend a "big enough" case for a Netduino Plus 2 in the $20-$30 range? It seems like this should be easier to find than it is. I am sure I am missing something. Or maybe this is a market waiting to be cracked?

 

 

 

Thanks.

I apologize for my lack of clarity. I am not asking about PoE. I am asking about using a simple ethernet switch (or hub) with "n" RJ45 twisted pair connections, being able to power a simple light. I understand that there is not a lot of power in each switch port, but I was guessing (hoping?) that maybe using 2-3 of them together could power an LED lamp of some kind. It seems like a simple utilitarian thing, but no one seems to make (or bg about home brew) such a device. Thanks!

I have a Netduino 2+ that will communicate over ethernet. The ND will have a AC power, and the ethernet switch is also powered by AC. I wanted to find an LED lamp that could be powered by the switch, thinking it would be good to have one less thing in my surge protector.... But web searches have turned up nothing as simple as a lamp that can be powered by a typical switch. Can anyone say why no such devices seem to exist? Thanks.

I have an LCD serial display for connection to my Netduino2+, so I think I will have a problem also connecting a serial clock, is that correct? is this page - http://blog.codeblac...d-with-I2C.aspx - accurate still in 2013? Thanks.

Can anyone recommend a time keeping solution for a non-networked Netduino Plus 2 that does not require soldering anything anywhere? I have seen a few kits from some favorite vendors, but nothing ready-to-go.

 

 

Thanks.

 

I did a quick search and found

 

http://www.tinkerkit...duction-to-dmx/

 

and

 

http://en.wikipedia.org/wiki/DMX512

 

which says

 

DMX512 (Digital MultipleX) is a standard for digital communication networks that are commonly used to control stage lighting and effects. It

was originally intended as a standardized method for controlling light dimmers, which, prior to DMX512, had employed various incompatible proprietary protocols. It soon became the primary method for linking controllers (such as a lighting console) to dimmers and special effects devices such as fog machines and intelligent lights. DMX has also expanded to uses in non-theatrical interior and architectural lighting, at scales ranging from strings of Christmas lights to electronic billboards.

 

 

Now if only Secret Labs would make a fog machine....

This looks like it had promise, once upon a time:

 

https://forum.sparkf...t=16946#p100892

 

but the links from there are long dead.

 

 

I wonder why an LCD-ready enclosure (with a couple of cable glands)  is such a rarity? Is everyone just exposing naked electronics, hoping their cat/dog/kid/curious friend doesn't touch anything?

Dave, yes, that is what I am looking for.

I have this serial display for connecting to my Netuino 2 Plus:

 

  http://www.amazon.co...0?ie=UTF8&psc=1

 

and now I am looking for a way to properly mount the display. I think what I want is a "bezel", so that any hole I nibble in my plastic case can have finished look. If that is the right term, where should I go for them?

 

 

Thanks.

 

[EDIT]

 

I think I found something. It just took a while for me to determine the keywords needed for the search engines.

 

https://www.oscsys.c...ore/product/253

I was looking at this

 

http://www.makershed...t_p/mkmts01.htm

 

 

Thinking that it might be valuable to have a Netduino Plus 2 attached and powered by it, and have that plugged into my AC outlet (I am in USA), so if the power goes out for any period my Netduino will keep running.

 

All comments appreciated.

 

 

Thanks.

 

 

What would be the benefit/drawback of connecting two Netduino units directly for communication? I have no real application in mind, just thinking that there might be a use to say have a 'mini detect a certain condition and then push a signal to a Plus 2. Just a random thought. All comments appreciated.

 

Thanksk.