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#1 Eppetiano

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Posted 16 April 2012 - 01:59 PM

Hell all, could anyone help me with this issue...? I'm trying to obtain 5VDC or 3,3VDC from power board pins but with no success. I'm using a multimeter to read voltage from pins 5VDC and GND but i'm not getting any value. My board is connect to my computer using USB cable. Thanks for your help! Best regards.

#2 Stefan

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Posted 16 April 2012 - 02:30 PM

Hi Eppetiano and welcome to the Netduino forums! What are the LEDs on your board doing? are they emitting? Normally when you power up your Netduino Plus, there should be power on the 5V and 3V3 pin. The right way to measure is indeed to put one probe on the V-pin and one probe on the Gnd-pin.
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#3 Eppetiano

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Posted 16 April 2012 - 03:41 PM

Hello Stefan, first of all thank you so much for your quick response. That's exactly what i'm doing, one probe on 5V pin and the other probe of multimeter on Gnd pin, but no reading values. I made an experience and place a led directly on pins 5V and Gnd but it didn't emitted any light.

#4 Stefan

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Posted 16 April 2012 - 04:13 PM

I made an experience and place a led directly on pins 5V and Gnd but it didn't emitted any light.

The mainboard itself also has two LEDs, one white power LED and one blue user LED. What do they do when you connect your mainboard to a power supply?
"Fact that I'm a moderator doesn't make me an expert in things." Stefan, the eternal newb!
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#5 Eppetiano

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Posted 16 April 2012 - 05:21 PM

Initially they both turn on and then only power led maintains active. The power supply i'm using it's my laptop, through usb cable.

#6 Cinelli

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Posted 30 May 2012 - 02:19 AM

I have a related question. I have two Netduini + units that will be deployed together side by side. Is it viable to only run 9VDC power to one, then power the second one by connecting the 5V power pin out to the other? Even if this were viable, I would wonder if this risks overheating the voltage regulator of the first unit. Or perhaps it is just best to power through the jack and voltage regulator in all cases? Thanks in advance.

#7 Chris Walker

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Posted 30 May 2012 - 02:29 AM

I made an experience and place a led directly on pins 5V and Gnd but it didn't emitted any light.

If you connect an LED between the 5V and GND pins, you might burn out your LED :) You need some resistance in your circuit.

Chris

#8 Chris Walker

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Posted 30 May 2012 - 02:31 AM

Hi Cinelli,

I have a related question. I have two Netduini + units that will be deployed together side by side. Is it viable to only run 9VDC power to one, then power the second one by connecting the 5V power pin out to the other? Even if this were viable, I would wonder if this risks overheating the voltage regulator of the first unit. Or perhaps it is just best to power through the jack and voltage regulator in all cases?

You can certainly use the 5V regulated output of a Netduino to power another Netduino. The one thing that I'd watch out for is power consumption (mA) as you mentioned. If you're using networking on both of them, you may start pushing the upper limits powering both from the same source...

I'd generally recommend powering each Netduino separately, but this is definitely possible.

Chris




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