Re: RAMPS for Due!
I've been looking at the thermistor inputs, in particular the fixed resistor in the voltage divider. I notice that the Duet hardware uses a 1k resistor here for both heat bed and extruder, not sure...
View ArticleRe: Anyone built a cooldrv stepper driver?
Thanks for the response, I will try that in a couple of days when I get home. Is that true for sanguinololu, ramps and gen7? I will try and post my success (or not) next week.
View ArticleRe: Anyone built a cooldrv stepper driver?
It's true for sanguinololu and RAMPS, I checked the PCB layout. Sometimes the jumpers are numbered 0 1 2. So if there is no MS3 then it's probably MS2.
View ArticleRe: RAMPS for Due!
Quotebobc We don't need 12 bit resolution on thermistors though. We can also afford to have a lot of filtering on the inputs, because temperature varies relatively slowly. Well, we do and we don't. If...
View ArticleRe: Anyone built a cooldrv stepper driver?
Thanks again, Looking just now I note that with all jumpers in place I had it set for 1/32 micro stepping and when I removed all jumpers it was set to full step but neither worked. Do you have to tell...
View ArticleRe: Anyone built a cooldrv stepper driver?
Yes it is essential the firmware matches the jumper settings. You can change the firmware settings to match what you are using instead. That will probably be in a config file somewhere, I'm not...
View ArticleRe: RAMPS for Due!
The problem is that the extra ADC resolution only helps if you also improve the electronics a lot. The analog performance on the printer electronics I have looked at is basically terrible. If you have...
View ArticleRe: RAMPS for Due!
Ok, I put in some proposed circuitry for the thermistor protection plus a couple of other small changes. [github.com] I have put the circuit in for THERM0, and a couple of variants with Zener and...
View ArticleRe: RAMPS for Due!
Ok, for the TLV431: 1) Bias resistor from +12 to top of regulator. 2) Nice big cap across regulator, a > 10uf electrolytic would do fine 3) Set resistors to get it to 3.0V 4) Clamp diodes going...
View ArticleRe: Arduino Due comms problems on programming port
Quick fix on the board you have - put a pull up resistor on the output of the '125 chip.
View ArticleRe: RAMPS for Due!
Cool, I think that is what I have. I guess that if we set the limit at 3.0V, then any voltage above is clamped there. That would mean we can't read temperatures below 80 degrees. While my Due is out...
View ArticleRe: Arduino Due comms problems on programming port
Quoteuncle_bob Quick fix on the board you have - put a pull up resistor on the output of the '125 chip. If this is the same TX/RX that comes out on Digital pins 0 and 1, then IMO you could put a...
View ArticleRe: RAMPS for Due!
Setting the device at 3.0V means that with the additional diode that should be in between it and the thermistor signal, you should get at least 3.3V, and at max 3.6V (depends on the forward bias...
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Re: Arduino Due comms problems on programming port
I have two Due boards One from RS the other a clone from geeetech Both have the 74LVC1G125 near the power connector like your bad type. The Clone you can clearly see the copper loop from pin 1 to pin...
View ArticleRe: RAMPS for Due!
Ok, if use 1k5 we get 3.1V reference. Looking at the SAM3X8E datasheet it says the max voltage is 4.0V on any input pin. Now you remind me I have got a set of stackable headers somewhere, I will try...
View ArticleRe: RAMPS for Due!
Quotebobc Ok, I put in some proposed circuitry for the thermistor protection plus a couple of other small changes. [github.com] I have put the circuit in for THERM0, and a couple of variants with...
View ArticleRe: RAMPS for Due!
Can't say I really have a preference, but SOT-23 seems to be a good option.
View ArticleRe: RAMPS for Due!
If you already have SMT parts on the board, then the SOT-23 makes a lot of sense.....
View ArticleRe: MK2 Heat Bed Wiring- stand alone
I'd probably opt for the varying temperature then. I've heard of people putting RAMBo's in CubeX's, but those are ~$180 ( [ultimachine.com] ). Is there another board people are using that's $40?
View ArticleRe: MK2 Heat Bed Wiring- stand alone
A Ramps 1.4 + Mega 2560 is roughly $40. I'd bet it will do the job. Don't know if it will fit inside the box....
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