Repairing an Arduino nano - Blown USB Power Diode
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- เผยแพร่เมื่อ 12 ก.ย. 2024
- I destroyed the USB protection diodes of 2 Arduino nanos (as you do), and now I've got to fix them.
It only takes a couple of minutes, basic SMD soldering skills, and the following diodes:
MBR0520LT1G Schottky Diode -- www.ebay.ch/it...
Thank you for the video. What should be the properties of an alternative diode?
2021 yep just killed one but thanks to you its in recovery :)
my nano smoked & has a hole on the diode, still works perfectly fine, also the mini usb connector is delicate 2-3 times plugging removing the blue cable damged the connector,now connected a permanent cable to the ch340.
I constantly plug & unplug the connector. It's still fine. Good idea, though, to solder-hack it and stop worrying... :-)
Thank you for the video!, can you please tell me if I can use the nano safely without the diode, i'm missing a soldering iron atm, i programed it with another nano of mine, it looks fine but i'm not sure! Thanks again!
If you are certain, never to wire it in reverse or have a short (test with multimeter in "beep" mode between 5V and GND)), then you don't really need the diode. I believe it protects the USB circuit (both on board and in the computer). Just don't blame me if either blows up.
on digispark(85) burned Schottky diode. Its marking is s4. Could you tell me the equivalent or the correct name. thank you
If you google "smd diode s4" you'll find that it's a surface mount schottky barrier diode (e.g. SD103AWS or Vishay SS14). You can also google "digispark 85" and then look for the schematics of the board (under documents or downloads). On the schematics, it's labeled as MBR0520LT, i.e. the one I used. Hope that helps. I suppose any is fine.
Hello, thank you for the video. Can you please tell me the direction of the diode, which direction should i place it?
The edge of the diode with the line should point "into" the board, i.e. be as far away as possible from the short edge of the nano's pcb.
i did short my arduino nano, and i change the diode with 1N4004 type
the board is on, but not detected anymore on my PC
is there any solution??
pin 3.3v doesn't have any power, so on IC CH340G also
There's no problem to replace it with regular schottky diode with same or better paraameters than this one, right?
20V 0.5A
If by "better" you mean "stricter", then yes. The diode protects the USB circuit, and you want more protection, not less.
@@musicandblinkenlights8280 Nevermind. Actually I thought about repairing arduino nano - after powering servo from 5+ output - which of course fried it. But then I didn't knewit isn't allowed to connect servo to 5+ output - before i was working on esp8266 microcontroller which allows that. I've read that either microchip atmega is burnt or it only needs bootloader. is that true?
@@qnaman actually I also did not know one should not connect servo to the +5V.. And did several things with 28byj48 directly powered from USB, that actually all worked without any problem. Now started new project and right after I have everything soldered together - it burned this diode... I think one should start sketch directly with zeroing all outputs and then drive with small delay between steps. Actually I have just measured - the coil resistance on 28byj is about 20 Ohm. It means with 1 coil powered only 250mA flow, that should be Ok. BUt in case two or more at once, for example using half steps - it is a problem..
@@TushhsuT 20V and 0.5A diode is okay or not? If not what should be the properties? Thank you.