prevent usb 5V backfeeding
I am new to this and in the process of building a prusa with sanguinololu 1.3 as printer controller, using a raspberry pi as host controller. When checking the wiki, I came across the usb 5V bug...
View ArticleRe: prevent usb 5V backfeeding
This is very intriguing. Thanks for sharing the idea. I haven't quite figured out what I was going to do about this and I couldn't quite decide if it was even still a problem (sometimes the boards get...
View ArticleRe: prevent usb 5V backfeeding
I couldn't find all the correct parts in my scrap pile but I did have extra USB cables. So I just took one and cut through the red +5V wire. I put some heat shrink on each end to make sure it wouldn't...
View ArticleRe: prevent usb 5V backfeeding
What a great suggestion! I would make one note; maintaining the ground connection can help shield the cables from noise. If you are using long runs of USB cable you should retain the ground...
View ArticleRe: prevent usb 5V backfeeding
Stemer114 Wrote: ------------------------------------------------------- > When checking the wiki, I came across the usb 5V > bug mentioned on > [reprap.org] > . > The powered usb hub...
View ArticleRe: prevent usb 5V backfeeding
Hi guysoft, I have tried both, connecting the reprap directly to the raspberry pi and via the hub to the raspberry pi using the customized usb connector, and both worked. However, right now I am using...
View ArticleRe: prevent usb 5V backfeeding
Well, maybe that wasn't mentioned in the original post, but of course the ground pins need to be connected. Only V+/5V is disconnected. See attached pictures (the red wire is only used as a pointer in...
View ArticleRe: prevent usb 5V backfeeding
Drastic as it sounds, I would just cut the +5V trace on the board. There is absolutely no reason for the sanguino to be powering to usb line. Cutting the trace takes 2 seconds with a pocket knife and...
View ArticleRe: prevent usb 5V backfeeding
lajos, I would have cut the +5 trace to the USB port, but it definitely went somewhere else as well so I would've had to cut two traces and then run a bypass wire and that is definitely more than 2...
View ArticleRe: prevent usb 5V backfeeding
Well, strange as it may sound, my setup initially required both: running the sanguinololu without and with 5V USB (at different times) - hence, the adapter and not the cut trace. Without 5V USB:...
View ArticleRe: prevent usb 5V backfeeding
You only need to cut one trace, the 5v supply at the usb connector. I'll take a picture and post it, if I dont forget ;) This information should really be on the wiki.
View ArticleRe: prevent usb 5V backfeeding
QuoteThis information should really be on the wiki. Then, please, put it there. Everybody has write access.
View ArticleRe: prevent usb 5V backfeeding
lajos, that would really help if you could post a picture of what you did. That way I could confirm we have the sme board and make the cut. Thanks.
View ArticleRe: prevent usb 5V backfeeding
This older thread has pictures. Pick only one option! [forums.reprap.org]
View ArticleRe: prevent usb 5V backfeeding
Attached is a photo of the +5v line cut on my board. Flip your board over, find the pads for the USB connector (4 pads in a rectangle layout above USB2TTL label). You need to cut the track going to...
View ArticleRe: prevent usb 5V backfeeding
Thanks lajos. That does look easy and seems like it should do the trick. I'm not sure why I didn't figure this out earlier when I was looking for a place on the board to make a cut. Maybe I was...
View ArticleRe: prevent usb 5V backfeeding
Not to necro, but I posted an alternate way to fix this to the wiki. The difference here is that the USB chip will stay alive and available to the host PC even if the printer is off since it lets the...
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