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There have been 24 items by lesmondo (Search limited from 26-September 23)
#23157 Neduino & IN13 Nixie Bargraph
Posted by lesmondo on 23 January 2012 - 03:29 AM in Project Showcase
First off I should say:
Warning!!! This circuit uses high voltage that may well kill you if you don't understand what you are doing!!!!
Also, if you mess up the wiring and put 120+ volts into your netduino, it wont't be very happy.
The display is part of a larger project hence the schematic appearance. R4 goes to a PWM output pin, the Anode to the HV PSU output pin and gnd to the HV PSU gnd and netduino gnd. Just to re-iterate the warning above, if the schematic as-is doesn't make sense or you are not sure of the schematic or what voltage is where, you shouldn't attempt this.
Something I did miss was the transistor type. Any HV one will do - an MPSA42 or MJE340 seem a popular choice.
In the video, the HV supply module is in the top right connected to its 12V supply via the red and black twisted leads. The HV output is the yellow wire to the anode of the tube. Gnds are tied together and are the black leads.
The tube as supplied has uninsulated leads, mine are covered in some heat shrink sleeving.
If you want to know more about these cool tubes, google IN13 bargraph will turn up lots of links. I'll also add the datasheets to my blog a little later today.
How it works
The RC filter acts to 'smooth' the PWM output into a control voltage.
R5 controls the current through the tube which in turn controls the length of light displayed. 1K is a starting value, if you find that netduino output doesn't drive the tube fully, you can reduce it. Assuming the base of the transistor is at 3.3V (the output voltage of the netduino at 100% duty cycle) the indicator cathode current will be
I = (3.3 - Vbe) / R5.
for an IN13 (from memory) this should be 3-4mA to light fully. Taking Vbe = 0.7, R5= 1K will give you 2.6mA. You might want to drop this in steps to say 470R if you find your tubes are lighting fully (they vary a lot).
R6 is for the auxiliary cathode - this helps to stop the display from breaking into multiple blocks (something the IN9s do apparently).
Hope this answers the questions. And be safe
Les
#23096 Neduino & IN13 Nixie Bargraph
Posted by lesmondo on 21 January 2012 - 11:19 AM in Project Showcase
#22645 Response: Pinging... Error: No response from device
Posted by lesmondo on 10 January 2012 - 06:50 AM in Beta Firmware and Drivers
If you have not done so already, could you take a moment and upvote the issue at these sites?
Device becomes inaccessible after deploying 4.2.0RC3 Firmware
Flashing tinyclr 4.2RTM to Netduino fails
Thanks
Done.
#22509 Response: Pinging... Error: No response from device
Posted by lesmondo on 06 January 2012 - 07:09 AM in Beta Firmware and Drivers
#22427 Netduino SDK API
Posted by lesmondo on 04 January 2012 - 05:30 AM in Netduino Plus 2 (and Netduino Plus 1)
#21973 Button OnInterrupt Reset
Posted by lesmondo on 22 December 2011 - 07:44 AM in General Discussion
As i was using the on board switch i got it working by doing the following:
public static InterruptPort button1; public static void Main() { button1 = new InterruptPort(Pins.ONBOARD_SW1, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLevelLow); WaitForButtonPress(); } private static void WaitForButtonPress() { Debug.Print("Waiting for button press..."); button1.ClearInterrupt(); button1.OnInterrupt += new NativeEventHandler(button1_OnInterrupt); while (true) { Thread.Sleep(15); } } private static void button1_OnInterrupt(uint data1, uint data2, DateTime time) { Debug.Print("Onboard button pressed"); WaitForButtonPress(); }
This might be of interest - a general purpose button class. http://nerduino.word...1/02/24/button/ (derived from http://geekswithblog.../09/142211.aspx )
#21207 Integrated Help files and documents?
Posted by lesmondo on 01 December 2011 - 07:13 AM in Visual Studio
#21206 VS2010 Pro Free
Posted by lesmondo on 01 December 2011 - 07:09 AM in Visual Studio
#21204 Netduino Plus... disenchantment is the word
Posted by lesmondo on 01 December 2011 - 06:59 AM in Netduino Plus 2 (and Netduino Plus 1)
#20097 Help with PWM and LEDs
Posted by lesmondo on 02 November 2011 - 12:18 PM in Netduino Plus 2 (and Netduino Plus 1)
#18401 Easy multiplexing with the Netduino
Posted by lesmondo on 25 September 2011 - 12:58 PM in Project Showcase
Sounds like a great plan! Mario's advise is a good one. If you can make the shield 'daisychainable' it would be awesome!
Hey, Thanks for the input. I wasn't planning on making these or selling them, it's just a project for me to update my PCB making skills. But once I've got the board working and debugged I'll post the cad files and a write up on my blog.
Of course, if you want the files now, just shout and I'll chuck them and some code into github.
L
#18400 Need Documentation for Netduino(SDK)
Posted by lesmondo on 25 September 2011 - 12:54 PM in General Discussion
thanks for helping .....
The microframework doco is installed with the SDK. If you want to add it to the F1 context help in VS2010 try this.
http://forums.netdui...dpost__p__18065
#18344 Easy multiplexing with the Netduino
Posted by lesmondo on 23 September 2011 - 02:56 AM in Project Showcase
#18272 Cortex M3 Arduino
Posted by lesmondo on 21 September 2011 - 05:38 AM in General Discussion
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.
Thanks, that's exactly the kind of article I was after.
#18115 Cortex M3 Arduino
Posted by lesmondo on 17 September 2011 - 02:06 PM in General Discussion
#18065 where is the .net micro framework documentation?
Posted by lesmondo on 16 September 2011 - 04:04 AM in General Discussion
#18061 Network Resetting Issue
Posted by lesmondo on 16 September 2011 - 02:14 AM in Netduino Plus 2 (and Netduino Plus 1)
Les, are you able to anonymise the capture data (without jeopardising it) so that a bug report can be submitted on CodePlex including the capture?
Update: I bought a cheap 10/100 switch from ebay and that's fixed the problem
#17797 Nplus to 74141
Posted by lesmondo on 09 September 2011 - 06:41 AM in General Discussion
#17302 Network Resetting Issue
Posted by lesmondo on 31 August 2011 - 02:33 AM in Netduino Plus 2 (and Netduino Plus 1)
#17044 Network Resetting Issue
Posted by lesmondo on 25 August 2011 - 05:55 AM in Netduino Plus 2 (and Netduino Plus 1)
Although your corporation might frown on it (some will)...
At my day job (an extremely large, security conscious corporation) we run on a gigabit switch network, some of us developers who need to use Wire Shark occasionally will also have a dumb, gigabit hub in our office… plugging in network, Netduino and your PC should allow you to “see” what’s going on between your N+ and the (anti-social ) company switch.
Shhh..... they might hear you That's what I'm hunting around for now. I'm also thinking that if it is the cisco switch/N+ combo that's the problem, maybe putting a cheap hub between the two might fix it.
#16964 Network Resetting Issue
Posted by lesmondo on 23 August 2011 - 01:16 AM in Netduino Plus 2 (and Netduino Plus 1)
Hi lesmondo,
If other devices work on this router, I'm guessing that it's a glitch in the lwIP open source networking stack.
Could you please post a bug report ("work item/issue") on this over at netmf.codeplex.com? The .NET MF 4.2 release is almost ready to ship...so this is the last chance to get critical bug reports in. [Otherwise, it could be a year before the issue is addressed in an official release.]
Also...do you have a copy of Wireshark? It would be really helpful to see a copy of the network traffic...see what is arriving at the Netduino Plus and what is going out...
Chris
Hi Chris,
I'll raise a bug report. Unfortunately since our network is switched I don't think I'll be able to capture the N+ packets - my PC doesn't see them.
Les
#16832 Network Resetting Issue
Posted by lesmondo on 19 August 2011 - 01:22 AM in Netduino Plus 2 (and Netduino Plus 1)
Hi oofki,
The Thread.Sleep function simply puts the main thread to sleep...you can have background threads running (including networking) without any issue.
Chris
Thanks Chris, like I said this was my simple as possible test case. Any ideas as to why the network would be resetting like this?
#16810 Network Resetting Issue
Posted by lesmondo on 18 August 2011 - 05:02 AM in Netduino Plus 2 (and Netduino Plus 1)
Can you post the code you are using?
Sure. It's basically:
main() { while(true) { Thread.sleep(5000); } }
I thought it was something to do with my code so simplified and simplified until I ended up with that. If you erase the app using mfdeploy so that there's no running program it still does the reset thing.
After reading this, http://forums.netdui...in-the-network/ it looks like I'm seeing the same issue - the link going up and down repeatedly.
#16790 Network Resetting Issue
Posted by lesmondo on 17 August 2011 - 12:18 PM in Netduino Plus 2 (and Netduino Plus 1)
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