Beginner question: Would this Camera Axe Shield be compatible with netduino? http://www.dreamingr...asg6tlhjfnj7vp3

I know some people wanted more analog examples and here it is! This was much easier than I thought, force sensors are not that complicated. These are called force sensitive resistors as well. Here is is:







Magic! Oh right the code....

            AnalogInput input = new AnalogInput(Pins.GPIO_PIN_A0);
            PWM led = new PWM(Pins.GPIO_PIN_D10);

            input.SetRange(0, 100);

            while (true)
            {
                led.SetDutyCycle((uint)input.Read());
                Thread.Sleep(1);
            }

See easy! enjoy

How would you do this using event handling and interrupt port?

SUCCESS I was actually able to UNBRICK my Netduino. It turned out that the issues were being caused by my OS. Atmel doesn't have 64Bit drivers and as soon as I followed the procedure on an windows XP 32bit I was able to connect to the device using SAM-BA and flash the TinyBooterDecompressor.bin to it. After that it was smooth sailing back on my Windows 7 64bit machine where I was able to flash the new Firmware using .NET Micro Framework Deployment Tool everyone can rest easy now we are back in business. Thank you Dan.

Which wiki article did you follow? Since you mentioned touching the pad with the 3.3v jumper I'm going to presume you followed "Installing the TinyBooterDecompressor step by step."

It was the Tiny Booter Decompressor article.

Have you run the Atmel SAM-BA programmer? You will need to manually specify the COM port (You will have to look in the device manager and find the virtual COM port which corresponds to your Netduino).

I did run the SAM-BA but by that time my Netduino was already gone to "Unknown device" state in DM and has no COM ports associated with it. When I try to install the Netduino driver on the "Unknown device" that my Netduino is in DM I get error code 10 "This device cannot start". I should mention that I'm connecting the device to my usb port by holding down the sw1 switch. I've tried without the switch and I get "Unknown device" and no com ports to choose for the SAM-BA.

After you have the new TinyBooter installed, you can then follow the Flashing new firmware step-by-step article and that should have you back up and running.

-dan

I wish

I've followed a few other "bricked" threads but no success. Current status: 1. Nothing is attached. 2. When powered up Both LEDs stay on all the time (blue and white) my Windows 7 reports the device as "Unknown" 3. I've held down the SW1 while attaching USB, results in "Unknown Device" This started happening when I connected the reset pad with 3.3V jumper cable, while plugged into USB. I was following the "Firmware Upgrade" wiki article. any ideas?

Firstly, I truly appreciate the great response my query prompted on this forum.
To be honest I feel a little proud I somewhat triggered such conversation and a possible tweek/improvement to the core of Netduino platform.

I have to ask why the Netudino (or any microcontroller) is being used in a circuit like this? It doesn't appear to be the right tool to use. Surely this is a job for something like the versatile NE555?

As Mario above mentioned, I fall in the category of geek that was always intrigued by electronics and knows (somewhat) how to solder, but ended up studding programming instead. So when it comes to voltage dividers and 555s and figuring what resistor I need to hook an LED? I have no clue. So I figure, I know how to program, I could follow some example circuit designs with analog and digital input sensors and adopt those to achieve a goal (however simple||challenging) and be proud of my electronic achievement. Plus I think it impresses my wife a little bit

Fair enough if you just want to see if it can be done.

That's exactly it. But more then just seeing if it can be done, us photographers are pretty much programmed to pay for gear and equipment. $50 for a Netduino to catch a bullet in flight may be an overkill but those high-speed photographers that are not do it yourselfers pay upward of $200 for prepackaged circuits that do the same thing.

See: Stop Shot or Camera AXE

To be able to catch a bullet consistently, fired from a BB gun is my personal goal at this time. And the reason I want to do it with a Netduino is expandability, ease of use by programming and off course the COOL factor.

Netduino operates with managed code, much more powerful, but also much heavier. The same task can take some millisecond, but it is also uncertain and variable time by time.

Is there a way to test this delay between tripping a trigger and performing a pin short?

Why would the delay be variable?

This is a valuable response .. I appreciate it.

The Arduino sample looks pretty good and really simple.
However, I don't think it can be performed by using a Netduino: the delay between the ADC reading and the flash trigger could be too long.
It seems to me that you need an less-than-one-millisecond response time: perhaps could be hacked in some way even with Netduino, but I guess is somewhat hard.
Cheers

Thank you for your response.

I'm not sure what ADC is there a delay between receiving a trigger from a sensor and performing a pin short? I was assuming that I'd be able to modify this delay programaticaly or through a web interface?

OK so I found this article.
It describes what I'm trying to achieve by using the ARDIUNO

LINK

Ultimately what I need to do is described in this link. DIY High Speed Photography

I need a delayed trigger circuit that can 'short' the flash hot-shoe pins (to fire a strobe flash) after getting tripped by sound or something passing through a gate (like a water drop)

I'm sorry if I'm not being clear ... I will look for some more links to share on the subject.

After performing a search on this forum I didn't find any information on the topic of High Speed Photography. Question: Would it be possible to trip (close circuit) of a camera flash on (for example) water drop passing through a photo-gate, or bb gun firing or bursting balloon? I imagine it's possible with the netduino. What parts would I need to purchase to achieve this? I'm a noob at all this circuit stuff, I'm fairly comfortable with a soldering iron but I would prefer a solution that's simple to assemble and to operate. I'm very comfortable with scripting languages and development. Thank you in advance.