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Websteria

Member Since 13 Aug 2010
Offline Last Active Oct 01 2010 04:02 PM
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Posts I've Made

In Topic: Arduino or Netduino

10 September 2010 - 07:50 PM

Well, most of the questions have been answered then.

It's by no means a deal breaker. It just means that you have to do things differently. Using a transistor or Darlington array to do the switching will work just fine, as mentioned.

@Websteria -
Neither platform will allow a buzzer to buzz. They are microprocessors and as such, pretty low current devices. Anything more than an LED and you should use something else to switch it.

What I was talking about is driving sensors off digital pins. This allowed me to turn them on and off when I wanted which saves battery. Still doable now but I need an extra component. Like I said, not a biggie. ;)

As an aside, if you do use something like a buzzer, please please please use a diode across it to stop any back EMF.


Even with something as low voltage as 1.5/3v? It seems the transistor should be able to stave off the EMF, if it were a relay then yes a diode is necessary... :-) Maybe I'm wrong.

In Topic: Arduino or Netduino

10 September 2010 - 04:04 PM

Interesting read - thanks...

My initial thought was "Cool, something I can write simple C# in".
I have a Netduino and am busy rebuilding a balance 'bot with it (currently runs on Arduino)

Overall I think it's a cool piece of kit with the biggest bonuses being the IDE used.

I would say, the biggest downer I have with the Netduino is the low sink / source capability of the pins. 8mA per pin IIRC. For all things digital, that's fine but I've used them for other things like the simple LED and using digital pins to power sensors (I can turn them on and off that way).
Oh, and it locked up on me the first day I had it. (Don't think it was my fault) but did the age old MS fix: Have you rebooted yet?

Some things that would make it great(er): (I know they will come with time)
- A "mega" but the inner pins have the same layout as the standard one. This will allow me to use normal shields but still have a mega
- Higher current capacity on the pins.
- Smaller boards. (My balance 'bot could do with less board and more battery ;) )

Other than that, I do like. :)

Oh, and "threading" ability is the best. I can [some would say be lazy and] just do things in different threads.

Cheers,
Crispin


My solution to that has been to use an NPN transistor and allow the "low source" signal to act as the switch to open the power to the higher voltage device. I used this (minus a netduino but same idea) to make a buzzer buzz (which requires 1.5-3v) when triggered by a motion sensor (enough output to light an LED, but not to buzz).

Jeff

In Topic: More PWM Ports

10 September 2010 - 03:40 PM

Hello, this is my first topic, first of all, sorry for my bad English.

I will start an automation project with PWM, I always meet up on arduino netduino.

I am C # programmer for over 10 years, enough to know like to do my automation using PWM netduino.

I'm having a hard time. I need at least 12 ports and PWM netduino saw that there are only four. The mega arduino has 14 orts pwm. I can increase ports of netduino pwm?

How?


Welcome to the community!

It depends on what you need them for. If you're wanting to do LEDs, you could use a bit shifter as the ground, and the bit shifter as the power source for the LEDs, or could plug it into a NPN transistor to open up the floodgates for the power..

http://www.sparkfun....products_id=733

If you need more just for needing more not sure there's anything you can do. I've thought about using fast switching on the digital ports for PWM but havn't played with it yet...

Jeff

In Topic: Power Converter? What are those things called?

09 September 2010 - 10:45 PM

Thanks. That's good to know. At this point, my hardware skills are minimal. The idea of surface mount soldering seems a bit beyond me. I have basic soldering skills and will be trying my hand at something that's more advanced - for me anyway - within the next few days.

Stacy


I just put this one together:
http://www.adafruit....products_id=184

It'll do 3.3, 5 and everything from 1-20 with an adjustment... well worth the extra $5.

Jeff

In Topic: 5mm Color Cycling LED

07 September 2010 - 03:30 PM

Websteria,

What shield is that you have attached to your Netduino?


That's the arduino protoshield from sparkfun, with a little half length breadboard on it... Easy to assemble and useful! :-)

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