demonGeek

With 4.1.2 already offering early USB client support, will USB communication between two Netduino's become a possibility?

Perhaps using a USB Host Shield like this one.

Thanks.

- Adam

I'm just starting to think about powering my projects from batteries.

I got this 2000mAh Polymer Lithium Ion Battery and this converter so I think I have the Netduino and sensors covered but I'm wondering about devices, such as motors, that require a bit more power.

I know there are a ton of options out there but I wanted to find out what people here are using and what works well.

Thanks in advance.

- Adam

I'm playing with some code to drive a Sparkfun Serial LCD and ran into some timing issues which caused a garbled display unless I put an 80ms delay (Thread.Sleep) between each write operation.

This was fine for testing but with the delay on the main thread it slows everything down whenever I write to the LCD. So I thought it might be a good idea to put the write operation on its own thread like this:

private void Write(byte[] data)
{
	new Thread(delegate { this._Write(data); }).Start();
}

private void _Write(byte[] data)
{
	this.port.Write(data, 0, data.Length);
	Thread.Sleep(80);
}

This code works fine as long as the debugger is attached but as soon as I deploy and reset the Netduino, the display ceases to function. The code itself is still operational (no exceptions, as far as I can tell) but the display thread doesn't seem to be doing anything. If I remove the threading and write to the device directly everything is fine again.

Is this expected behaviour? Is there some better way of doing this that I don't know about?

- Adam

_{[N+ firmware v4.1.1.0 ALPHA7]}

I'm playing with a Parallax Ping))) Sensor and was wondering what would be the best way to interface it to my Netduino.

I've found some code samples that are based on a TriStatePort but it seems to me that an InterruptPort might be a better way of doing things. The trouble is that I'm not very experienced with either of those types of port so I'm looking for some help and advice.

I tried to set an interrupt event handler on a Tristate port like this:

TristatePort tristatePort.OnInterrupt += new NativeEventHandler(Port_OnInterrupt);

but that produces a System.InvalidOperationException. No idea why...

I then tried creating an Interrupt port and event handler which seems to be fine but I don't see how to send the trigger pulse in that situation so the interrupt never occurs.

Thanks.

- Adam

I just want to instantiate an SPI object but I keep getting this:

An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.SPOT.Hardware.dll

Here's the code:

SPI.Configuration spiConfig = new SPI.Configuration(Pins.GPIO_PIN_D8, false, 250, 250, true, true, 1000, SPI.SPI_module.SPI1);
SPI spi = new SPI(spiConfig);

What am I doing wrong?

 
EDIT:
I've been looking at this for a while now and I'm beginning to wonder if this error might indicate that there's a problem with the connection to the SPI device (or the device itself). The device is this flash memory board connected as follows:

CS# <-----> D8
SCK <-----> D13
SDI <-----> D12
SDO <-----> D11


I've also tried (unsuccessfully) connecting the BUSY# pin on the board to D7 and then specifying that in the other constructor overload:

SPI.Configuration spiConfig = new SPI.Configuration(Pins.GPIO_PIN_D8, false, 250, 250, true, true, 1000, SPI.SPI_module.SPI1, Pins.GPIO_PIN_D7, false);
SPI spi = new SPI(spiConfig);

_{[N+ firmware v4.1.1.0 ALPHA7]}