Voltage drops on DC-IN

[seities (Banana Pi Korea)]

if a person in this area (SBC) does not knowhow to solder a wire to a hole in the board

Soldering a wire or two can be done on my board, but I won’t be able to do so for all BPI-M3 boards.

or recognize limitation of a plug,

I am here to gather information on BPI-M3 since there are some issues. By accident, it seems as one of issues bypassed (not resolved), I just wanted to share what I experienced although nothing is confirmed by various tests.

Sadly but truly, I have to admit that I know next to nothing about SBC’s or not even close to be a hell of a coder, but surely I am an engineer providing solutions to problems. Please be understanding that I am not here to criticize anyone’s idea nor to be criticized for my poor knowledge although I am open to any sort of information to learn and help me get closer to solve issues that I am having.

[Dracon]

By accident, it seems as one of issues bypassed (not resolved), I just wanted to share what I experienced although nothing is confirmed by various tests.

Sorry, but choosing micro USB was not by accident but by intention. Pre-production samples used a quality DC-IN power barrel as it is in use with the M2 already. Then the BPi folks went crazy and exchanged this with micro USB for the production batch: Please, update Specs of M3

And I fear I have to agree with Tido. When you’re not able take real tests others already made into account (just read through this thread from top to bottom and follow some links!) then it’s not worth to further discuss this. At least for me the 2 disadvantages of micro USB are known and accepted: Limited maximum current (1.8A by specifications, maybe 2A in reality) and always risking undervoltage situations where the board might suddenly power off.

Since the M3 is incompatible to the original Banana Pi M1 I would better go with other A83T/H8 boards like the Cubietruck Plus if I really need the octa-core power of the CPU: http://www.cnx-software.com/2015/12/28/cubietruck-plus-development-board-with-displayport-hdmi-sells-for-84-in-china/#comment-521141

[Tido]

It is not my intention to be mean to you, just honest.

1. As I wrote before, you must have software that can make use of all 8 cores.
2. If you order more, you can ask for different power-connector

What puzzels me: If I look at your profile, it says something about Korea. If so, why don’t you checkout the http://www.hardkernel.com ? Made in Korea.

[seities (Banana Pi Korea)]

Well, Tido, I am one and only SINOVOIP distributor in Korea.

I have to deal with angry customers if this problem is not resolved! Plus, I won’t be able to sell more BPI-M3’s. Does it explain?

I want a quick and simple fix. That’s all.

Please don’t get me wrong. I’d like to discuss issues and get closer to possible solutions and share information. I am guessing that’s why we are all here, right?

As I wrote before, you must have software that can make use of all 8 cores.

RISC processor are made for multiprocessing, and ARM is one of them. Linux itself will use 8 cores, and we can always write programs which can utilize all eight cores if necessary. In addition, I totally recommend M1 and M1+ to my customers, but they like M3. I also like M3 due to its CPU performance and eMMC on board.

If you order more, you can ask for different power-connector

I agree! I think it is a design fault by SINOVOIP using otg to supply power. Now, at least, I know I can get this damn thing working without any power issue when I am using 2.5A otg power adapter. I am looking into limits and negative effects of high currents of otg power. If you have information, I would appreciate some.

If I look at your profile, it says something about Korea.

Well, you don’t have to be a Korean to live in Korea. As a matter fact, I am an American, but I am also Korean. However, legally, I am not a Korean at all.

Although I don’t own an odroid, I think it is a good SBC. However, it is too expensive and too much of SBC. A fan on SBC? That, I don’t like it. For now, I don’t like odroid because I am a BPI distributor! lol~

Sincerely, thanks for your comments!

[seities (Banana Pi Korea)]

I admit that Tido and you are right.

When you’re not able take real tests others already made into account (just read through this thread from top to bottom and follow some links!) then it’s not worth to further discuss this. At least for me the 2 disadvantages of micro USB are known and accepted: Limited maximum current (1.8A by specifications, maybe 2A in reality)

I am planning to look into this a little more because now I have seen 2.5A otg power supply. I didn’t invent one, but it was given by a cell phone store. Plus, it have been powering up my BPI-M3 running Ubuntu for over a day now.

I even recommended one of my customers to solder a real power adapter connector. I know SINOVOIP is going to release 2nd batch of BPI-M3’s, and I wonder if there will be any fixes.