Re: Choosing Thermistor based on table - Marlin
Huh, what, no. The logic voltage is 5v, in our case, this is the voltage that thermistor "is involved in". Microcontroller pins dont take any more than that. There is a voltage regulator onboard that...
View ArticleRe: Firmware to drive X-Y galvanometer
I think if we went with an enlarger lens, we could forgo the F-theta lens. Enlarger lenses are also a flat-field focus, it's simply that it would require software correction - the angle in vs. the...
View ArticleRe: Choosing Thermistor based on table - Marlin
So, the oversampler number in the Marlin table is 16, can I then say: Ohms at given temp divided by 16 is the value for that temperature in the table? Sorry I was sleepy, ofcourse I understand that...
View ArticleRe: Firmware to drive X-Y galvanometer
It seems to me the problem with large build area and high resolution is very long build times. The demo print on the mUVe takes 11 hours at 300mm/sec, for a 100mm sized part. I wonder if it would help...
View ArticleRe: Choosing Thermistor based on table - Marlin
Again, i dont have a clue whats with that oversampler, and why its there, so i try to guess. In principle an oversampler is a good ideea when there is a fast changing input. But well, that is really...
View ArticleRe: Choosing Thermistor based on table - Marlin
I am not going to be able to do this.. I will just turn it on an register the temperature at which the hotend has a good flow when I hand-feed it. My plan to make my own table for Marlin was ambitious...
View ArticleRe: Choosing Thermistor based on table - Marlin
R1 and R2 are the sense resistors on your electronics. Most electronics only have R2, which is 4.7Kohm as standard. So set R1 to 0, R2 to 4700, and let it run. Also, the newer script from this...
View ArticleRe: Choosing Thermistor based on table - Marlin
Ok, sounds worth a try. So the sense resistor (RP) would be 4700 in this case? (4.7K Ohm) and: t0 = 20 / r0 = 124922 t1 = 120 / r1 = 36736 t2 = 220 / r2 = 3692 So these values are from the temperature...
View ArticleRe: Choosing Thermistor based on table - Marlin
In this thread r1 and r2 are first mentioned in 3rd post from the top (:P) This is a better distribution of smaller intervals in interesting ranges. // Thermistor lookup table for RepRap Temperature...
View ArticleRe: Choosing Thermistor based on table - Marlin
I will re-calculate, the way I did it now, my temp is reading -22.... Damn :(
View ArticleRe: Choosing Thermistor based on table - Marlin
When I put in those values the hotend temp just displays a static 27Âșc Doesn't go up when heating up? I added *OVERSAMPLENR from the other Marlin codes, but now at 220Âșc and it doesn't want to work....
View ArticleRe: Choosing Thermistor based on table - Marlin
It's not gonna work. I tried every single way of applying it and In repetier it says that the nozzle is at 220 degrees, but the hotend won't do anything. I can barely get the filament flowing through...
View ArticleRe: Firmware to drive X-Y galvanometer
... for a single scanning axis you can find cheap 'flatfield'-optics by salvaging old laserprinters - could be even simpler to use the faceted mirror-wheel instead of a galvo-scanner ;)
View ArticleRe: Choosing Thermistor based on table - Marlin
Assuming exact numbers of 5v and 4700ohms, and the pdf with your temperatures and resistances my math looks like this: Thermistor table Adc Temperature 1007.71 1 985.91 20 939.93 40 859.42 60 740.71...
View ArticleRe: Choosing Thermistor based on table - Marlin
Hi, with these values I still needed to put the values very high... So I reverted to using #6 and having to input the printing temp as 250ÂșC now. I have discovered that 41*OVERSAMPLER (or 41*16=656)...
View ArticleRe: Choosing Thermistor based on table - Marlin
Dunno about abs at 220c, i print abs at about 240c, and that was calibrated with thermocouple inside barrel. Why are you so fixed on the 220c value, to me that seems low for abs printing, and why are...
View Articlehow to open the megatronics.sch
I use eagle or protel,But there are some errors,how to open the megatronics.sch?
View ArticleRe: how to open the megatronics.sch
Protel would have a *.lyt for layout file. Eagle would have a *.brd. Kicad would have a *.pro for project. But this is Design Spark file, as it has *.prj for project. I opened this in DesignSpark and...
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