zorlack

Hello,

I'm interested in looking at the Netduino pcb layout.

I tried opening the pcb layout on the website, but it seems to be a .brd file without an associated schematic. 

I click File | Open | Board and then enter the path to the .brd file.

Eagle complains with this:

Loading C:/Users/username/Desktop/netduino.brd ...Error:line 1, column 2: Start tag expected.

I'm using the free version of Eagle.

Any idea what I'm doing wrong? Is there a Netduino.sch file available, or is the schematic only available as a PDF?

Thanks so much!

-Z

Hello all,

There's quite a bit of literature about this topic, but I'm having trouble understanding all the implications. I'm working on a project which I'd like to have PWM-controlled LEDs.

I've been reading that I need a current-limiting resistor to protect the Netduino's PWM pins from damage. I was wondering if this is always the case.

I have some LEDs which state that they have a 3.3V forward voltage at 20MA. By my read that should not unduly stress out the PWM pin.

Am I misunderstanding the characteristics of the LED?

A little guidance would be helpful.

Thanks so much!

-Z

I'm trying to read the temperature off a TMP36 temperature sensor, but I've found that I when I have an LCD connected to the Netduino I get incorrect results.

 light-temp.jpg   117.92KB   36 downloads

When I have the LCD connected I get temperatures which seem to fluctuate and are off significantly. When I remove the LCD things tend to be fairly steady. The LCD I'm using is is SparkFun's 3.3V 16x2 Serial Enabled LCD. The documentation says that this LCD draws about 60ma when the back-light is on. 

Is this too much for the 3.3v bus on the Netduino? Right now I'm powering via USB, would this be different if I was using wall power?

Whats the best way to handle this situation?

Many thanks!