Re: RAMPS for Due!
Ahh yes, I was misreading the spec sheet. Looking at the table on the wrong page. Was somewhat annoyed by the fact that the spec sheet said it was for ACT, but showed specs for AC and ACT. Doh! Carry...
View ArticleRe: RAMPS for Due!
If all you are driving is logic, there's virtually no static current off of a hypothetical 5V supply. The regulator would not need to be very hefty. If you want to handle servos and other bits of this...
View ArticleRe: Azteeg X3 external stepper drives
The board is designed to run the little low current plug in driver boards. It's not designed to drive an opto isolated external stepper controller (which is what I suspect you are trying to use). Just...
View ArticleRe: Opensource PIC/ AVR bipolar stepper driver
The TI parts are easy to get, i ordered some and will reach this week, getting allegro parts here is like dance according to tone of distributors here
View ArticleRe: RAMPS for Due!
Quoteuncle_bob Of course if you *do* have a 7805 in there, that will make driving opto isolated stepper controllers a bit easier .... (yes that's a turn into the ditch and over into a whole other...
View ArticleRe: RAMPS for Due!
I have a fairly simple board laid out for the opto drive. It simply takes the control lines through resistor-transisotrs to generate open collector logic. The motor winding pins are used to connect to...
View ArticleRe: Opensource PIC/ AVR bipolar stepper driver
The TI parts should work quite well. Hope you get yours soon!
View ArticleRe: RAMPS for Due!
I've pushed a bunch of schematic changes to the github, based on recent discussions. I didn't add a 5V regulator for now, I realised we still need the 12V regulator to provide VIN to the Due. Brief...
View ArticleRe: Echo: SD init failed on RUMBA
You may have a bad card socket on the Rumba. There's also the issue that the timing is not quite the same on all of these interface boards. A marginal SPI implementation on a card may work on one and...
View ArticleRe: Megatronics V2.0 trouble
Thanks for the suggestions. I measure 12V at both the inlet terminals. I'll investigate the fuses
View ArticleRe: Echo: SD init failed on RUMBA
Well. I ordered a LCD with a sd-card slot. Hopefully this will work.........
View ArticleRe: RAMPS for Due!
Quotebobc #19 change E-STOP buffers to HCT type to always drive FETs at 5V and remove inverting drivers on heater outputs; If you want to drive the FETs with more than 5V, there are a few "outside the...
View ArticleRe: Real-time filament caliper sensor
I wonder if you could bounce a laser off the front and back of it. Like range finder.
View ArticleRe: RAMPS for Due!
The drivers are 30 cents a channel, so that's not really to crazy. An op-amp is going to be slew rate limited, you will spend more time doing the switch than you would like to. It's also going to be...
View ArticleRe: RAMPS for Due!
The op-amp idea was one I had thought of and discounted as they don't always provide a lot of current. Looking at it, the LM339 can't sink a lot of current (max 16mA) which might be a problem. An...
View ArticleRe: RAMPS for Due!
The Mircochip parts are dual channel drivers. They need normal / already there bypassing. They work fine with a 10 ohm resistor (or no resistor at all) going to the gate. No other extra parts /...
View ArticleRe: Real-time filament caliper sensor
You need to get a reading that good to 0.01 mm. That's pretty tight.
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Re: Real-time filament caliper sensor
Air Ring Gage very accurate tool to measure diameter, and roundness: Min Dia 2 mm Resolution: 0,01 um. Repeatablility range: < 0,15 um. [www.mahr.com] [www.marposs.com] [www.westerngage.com] The...
View ArticleRe: RAMPS for Due!
The TC4426ACOA and TC4427ACOA's look reasonable, though the cheapest I can find them for (with availability) is around the $1 mark (so 50c a channel). Still fairly reasonable, and we'd only end up...
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