Re: Proper Resistance of a Heated Bed
Thank you cdru. That is more good information and is really helping me get a grasp on these issues. I read the catalogue and looked up some of the alternate connector manufactures you mention....
View ArticleSainsmart mechanical end stop = Blown mega
Hey All, So I finally am finishing up my Prusa I3. With sainsmart Ramps 1.4 + A4988 + Mega2560 R3 + LCD 12864. I was able to get everything working but the end stops. I ended up shorting VCC to Gnd...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
when you plug endstops in wrong way you short +5 to gnd and blow the voltage regulator on the mega The ramps supplies the voltage regulator 12v via D1 which it converts to 5v for both the mega and the...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
The voltage regulator on the Mega is short-circuit and over-temperature protected, so it's unlikely to have failed. Also if you can see the LCD menu and the functions work, then Vcc must be OK, unless...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
PS - it occurs to me that when you say the LCD goes dark, you may mean that the backlight lights up but all the pixels are dark. If that is the case, then the contrast pot or resistor on the 12864...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
Thanks for the replies guys. If I just have the usb plugged in all works fine and the lcd works perfect. When I power up my 12v the lcd greys out. I can still see the menu but it's washed out. I can...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
1. Before you had the short, did the LCD display work properly without the USB connected, or did you never test it that way? 2. Do you have a multimeter? If so, measure the voltage on the +5V rail...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
Yes dc42 it worked fine with just the USB, both USB and 12v, and 12v only. It's strange. I swapped a mega from another project I have and all is good !!! So it was the mega. It worked out good because...
View Articleatmega644p bootloader
i have a strange problem with a board based on the atmega644p .. I am able to burn the sanguino bootloader using the arduino as the ISP. Also i am able to upload sketches directly without the...
View Articleat90usb1287 teensylu
Hello everybody i am new to this forum and to 3d printing i wont to make a 3d printer based on the teensylu electronics but the problem is that where i live we don't have the AT90USB1286 i can only...
View ArticleRe: at90usb1287 teensylu
According to the Teensylu wiki page: QuoteTeensylu clone, Atmel's AT90USB1286 - AT90USB1287 drop-in compatible for 20mhz support So they are interchangeable. A little more digging and it looks like...
View ArticleRe: Need to flash bootloader
Fantastic! :S Probably why I cant get past this error: avrdude: initialization failed, rc=-1 Double check connections and try again, or use -F to override this check. Until I read that thread,...
View ArticleRe: atmega644p bootloader
there are a few 644p bootloaders about that dont actuly work. And you need the correct one for the correct frequency your runing the chip at (16 or 20 mhz normaly) And since the IDE also sets the...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
Glad you got it all sorted Dispite dc42 saying "The voltage regulator on the Mega is short-circuit and over-temperature protected, so it's unlikely to have failed. " this proves to me it was yet...
View ArticleRe: atmega644p bootloader
@dust Thanks i will give it a try .. The board is custom made for a small robot..It uses a 16mhz crystall and 22pf capacitors [attachment 44694 doodlel293dd.sch] [attachment 44695 doodlel293dd.brd]
View ArticleRambo 1.1B 2 heated beds and 1 extruder?
Hi guys, I'm building a scaled up version of a Lautr3k. What I want to know is if the Rambo 1.1B board can be used to power 2 heated beds and 1 extruder instead of the default 2 extruders and 1 heated...
View ArticleRe: Sainsmart mechanical end stop = Blown mega
I agree, those regulators never seem to survive a short like that
View ArticleRe: Sainsmart mechanical end stop = Blown mega
Yes, I agree that the regulator was at fault. I guess there must be some other factor in play here, such as the nature of the wiring causing a transient that the regulator can't survive.
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