5 replies to this topic

[JacopoMTK]

Hi everyone,

 

I'm building a midi controller with Netduino Plus 2 and I'm at the point of powering up the project but i need to ask some questions firsts.

 

Those are the components used in the project:

-5x Switch with led [5-12v]

-10x 10kOhm Potentiometer

-2x 7-Segment Display

 

I'd like to know if the Netduino +2 is capable of powering up the whole thing trough the 3.3v line without getting damaged (assuming the led in the switch will light up even with 3.3v).

 

Also i'd like to know a thing about the potentiometers:

If i will use a 9v alkaline battery to power up the netduino (and then connect the potentiometers to it),will i get different reading while the battery keeps draining or the regulated output of the netduino will continue to give me 3.3v?

 

Thanks in advance.

[JacopoMTK]

Ok...let's say i'm using one of these power supply board [max current 800mha] connected to a wall adapter.

I could use it to supply both the netduino and the led's.

My question now is:

-Is it safe to power up the netduino trough the 5v pin?

 

I read in many topics that a lot of people do that but i also read one saying that it could be dangerous...what's the official version?

 

Thanks in advance.

[nakchak]

You can power the ND fine from the 5v pin, have designed several projects that power the device that way.

 

As for that breakout board it may be easier for you to use LM7805 5v regulator board can be had for next to nothing, or buy a 5V plug in regulated adaptor then all you would need is a barrel connector to connect your project to power, but if you want it to be battery powered you would be better off having the regulator in your project...

 

NAk.

[JacopoMTK]

Thanks a lot,i'm gonna power the ND trough the 5v pin then.

it will save me a tons of problems .

 

Thanks for the tip on the LM7805,i'm defenitely going to buy some with the next order!

[nakchak]

No Problem

 

Along with 74 series of logic gates the LM78xx and LM79xx (-ve voltage regulators) are some of the most often used hobbyist components, also worth noting is the venerable 555 timer chip, and the LM317&LM337(-ve version) adjustable regulator (0-15v).

 

You may want to get a small heatsink for the regulator as they do warm up during use, but as long as your current requirements are low then heat shouldn't be to much of a problem.

 

Nak.

[JacopoMTK]

Just ordered 5 of everything you said in the post

Thanks a lot for the tips!