Re: Crowdfounding Project "SAV MkI 3D printer electronics"
The issue with the 7805 is that you can very easily have a load on the input to the device when you are powered off of USB. A fan set up for full time use, a light on the LCD display, even a pull down...
View ArticleRe: Looking To Buy DIY Reprap Kits : Hadron Ord bot or others.
This probably isn't the best area for posting "want to buy" messages.
View ArticleRe: Crowdfounding Project "SAV MkI 3D printer electronics"
You could indeed. As a matter of fact that is what I have on my printer and nothing, the light are not even light at 4 volts and the fan doesn't consume much. I will try to pots a picture too with the...
View ArticleRe: Gen 7 board, AVR 1.5 board, steppers not turning/working
To put it simply, none of your motors run no matter how you try to run them. Is that correct? Does your hot end / heated bed heat up properly? Is this a printer that was working up and working?...
View ArticleHaving issues with new MendelMax 1.5 build
Hi! I just finished my MendelMax 1.5 build. I uploaded the Marlin firmware, and the X-axis seems to work ok, but Y-axis is very jerky. It'll move a few inches, then the motor will sound like it's...
View ArticleRe: Having issues with new MendelMax 1.5 build
Motor current is set by the pots on the stepper driver chips. Do you know what the current specs are on your motors? If so, grab a DVM and see how the Vref on the drivers compares to the proper Vref...
View ArticleRe: design firing circuit for thyristor
A more conventional approach to this problem is to rectify the AC at high voltage, then use a DC-DC converter. For larger loads, you may want to use a PFC circuit instead of the normal...
View ArticleRe: Gen 7 board, AVR 1.5 board, steppers not turning/working
EDIT: it turns out that I'm and idiot - what happened is that I accidentally unhooked the +12v and +5v molex pins extender thus cutting power to the steppers themselves. After reattaching it, the...
View ArticleRe: RAMPS for Due!
Quoteambrop7 Oh, I've fixed the inverted heaters problem in APrinter. I don't think there's anything now preventing it from running on a real RAMPS-FD. @bobc If you find some time could you give...
View ArticleRe: RAMPS for Due!
Quotekarabas Does your code use advantages of the arm? Why only 250000? I have simply implemented the HALs that my firmware depends on (e.g. GPIO, serial port, ADC, timers, SPI). Due to faster CPU and...
View ArticleRe: RAMPS for Due!
Quoteambrop7 Oh, I've fixed the inverted heaters problem in APrinter. I don't think there's anything now preventing it from running on a real RAMPS-FD. @bobc If you find some time could you give...
View ArticleRe: RAMPS for Due!
I have not used the AVR version of the ARM ADC. On other flavors of ARM, the ADC is quite good. Running it in 16 bit readout mode is well worth the effort on some ARM's. You can get ENOB's in the...
View ArticleRe: Gen 7 board, AVR 1.5 board, steppers not turning/working
Ok, so here's a story - Needless to say I've had a lot of experience with computer plugged in, all the lights are on, why isn't is stepping ... what's broke now .... ahhhh .. need to plug in the +12...
View ArticleRe: RAMPS for Due!
Quotebobc The erase button is pretty much inaccessible with the RAMPS-FD attached, but the command "stty -F /dev/ttyACM0 1200" will erase the Due and put it into the bootloader. Yes, I read that in...
View ArticleRe: RAMPS for Due!
When you fix the thermistor tables, think about some sort of "transparent" fix. There are vendors out there supplying tables for their thermistors, but not flowing them upstream. Why they do this - I...
View ArticleRe: RAMPS for Due!
Quoteuncle_bob When you fix the thermistor tables, think about some sort of "transparent" fix. There are vendors out there supplying tables for their thermistors, but not flowing them upstream. Why...
View ArticleRe: Sanguish development
1.1 seems to be working fine. I'm still getting some interference between the mcp2200 and the other serial headers even though it's powered down when disconnected. Some usb-serial cables work and some...
View ArticleRe: RAMPS for Due!
Tables are nice to take care of a variety of issues. I have yet to see a thermistor that actually follows the "official" curve out to the sort of precision some people seem to expect. That said,...
View ArticleRe: Sanguish development
Hi My markdown beta and bare 1.0 boards arrived (: Been soldering up the 1.0 first though (: Noticed some points - correct me if fixed in 1.1 - have not checked the board layout this morning 1. Mini...
View ArticleRe: RAMPS for Due!
Quoteambrop7 About baud rate, I just chose 250000 because I didn't see a need for more. It is configurable anyway. But it's limited because we're talking about the programming port, not the native USB...
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