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Andre Trollip's Content
There have been 12 items by Andre Trollip
(Search limited from 11-May 23)
Yes I know it's not really subject appropriate, but I find I get more concise and quicker answers on electronic questions than on other electronics forums.
I am currently researching the possibility of porting an existing Javascript engine to NETMF (as that is more or less what I do for a living). I will let you know what I find out there if I don't do it myself.
I'm just wondering if anyone can tell me what the max amperage is that can be pulled from the 3.3 and 5V power rails of the N, N+, N2 and N2+ respectively, when powered from VDC jack and not USB?
I'm guessing whichever is smallest, 1A or A Max of the input source.
Or does the overall 125mA limit apply to the power rails as well?
As is the case with all class types, the type information for a static class is loaded by the .NET Framework common language runtime (CLR) when the program that references the class is loaded. The program cannot specify exactly when the class is loaded. However, it is guaranteed to be loaded and to have its fields initialized and its static constructor called before the class is referenced for the first time in your program.
To put it differently, the only guarantee that the CLR makes (with regards to static constructors) is that the static constructor will have run before any member (field, property or method) is accessed. Regardless of whether the accessed member is static or not. Other than that, you should not rely on a static constructor running at a specific point in time (or order).
As long as the CLR doesn't breach this principal, it can be implemented differently for the tinyCLR, .Net CLR, Any CLR etc. ;-)
I would like to power my Netduino and Stepper motor (via EasyDriver) from the same 12V power source. How can I protect my Netduino from the current "backdraft" as the motor starts and stops? Or is it not quite that simple?
I remember having to do that for a normal DC motor on a different project a while back.
If you are worried that the driver board will feed current back to the 12V supply, then add a rectifier diode in the positive line between the battery and the driver so it can only take current - that should protect the Netduino from high voltages.
(Note that the EasyDriver circuit does not have any protection for its own logic supply, so I don't think they are expecting any problems like this. However they do have a 30V tolerant input.)
You might also add a similar diode to the Netduino supply input and add a big capacitor after the diode so that short brown outs are less likely to reset the Netduino.
Thanks a lot Paul. The feedback is exactly what I was worried about. I had the first diode in place and the cap as you recommend, but not the second one.
I will let you know how it turns out. I think I damaged the driver somehow because it stopped working at some point while I was fiddling. Waiting for a couple of new ones I ordered. At the same time I ordered some Polulu ones (Allegro’s A4988). I'd like to compare the two.
I have an XBee 24 Series 1 and I'm trying to use it on my Netduino Plus using an Arduino Wireless Shield.
It works beautifully until about the sixth or seventh command that I send to the module in API mode through the serial port, then it doesn't respond. If I ignore that lack of response and continue to send commands, it works again for an arbitrary number of commands and stops again.
My serial port is set up for 9600, No Parity, One Stop Bit, and 8 Data Bits.
I do not send and receive simultaneously. I have also tried flushing the port after every send and receive. And I've tried waiting 5 seconds after every command. These things didn't work.
It seems to not be related to the type of commands I send.