martin2250

Hi Mario,

your concern is very appropriate, an electrostatic discharge will very likely do damage, and the limiting diodes are a very good addition. I don't know about STMicros controllers, but at least AVRs do have internal clamping diodes. Some external diodes won't do harm though (decrease accuracy a bit though).

Although the capacitances are in the range of 50pF, a large value resistor does decrease the sensitivity dramatically.

Normally, you'd have the sensing plate behind a dielectric to prevent arcs alltogether or use an actual sensing IC.

Anyways, this is of course more of a proof-of-concept and not really feasible for anything that is supposed to last.

Greetings,

Martin

Hi Chris,

as I already mentioned, I don't need any libraries. My main concern was the simple upload process with just a virtual COM-port. I guess I could compile a .hex file and flash it with SAM-BA, but that would be much slower, and on my PC/Board configuration, it takes multiple attempts most times (uploaded the Netduino firmware again after bricking it with PWM). The Cortex-M4 already has integrated USB support, so a small bootloader that runs for ~5 seconds when the reset button was pressed, appears as a CDC device and accepts new firmware should be possible.

My idea was to use Atmel Studio with gcc, and upload the code without having to mess with the hex files etc.

thanks for your time

Martin

Hi Prashant,

this one looks totally fine, but since it has no cable, you should get an USB extension cable to connect it.

Greetings.

Hi Graham,

first of all, you don't need the pro version. You should still have acess to all relevant features.

If you can't find the Project type 'Netduino Application' then you're probably missing the SDK: http://netduino.com/downloads/ since the trial of my copy of 2012 is over I can't tell you where to find the option if you already have it installed.

Anyways, you should check out video tutorials, since you can see every step. Otherwise I'd recommend using VS2010 or even 2008, at least on 7 / Vista / XP, in my opinion they're more clear.

Greetings,

Martin

if you don't need that much current, your netduino should just be able to handle 20V, according to the datasheet of the voltage regulator, I wouldn't recomment it though. I think what you need is a voltage regulator, like this one: http://www.parts-exp...partnumber=7809

Greetings,

Martin