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CDRIVE
Hauling 10' pipe on a Trek Shift3
No, the H-Bridge has to be cannibalized from a VCR. They're mounted on a dedicated board. You remove the entire board.
Josh, as I said before we need to see the data thats coming with your controller. Saying anything more before you receive it would be guess work.
Chris
Hey guys, i would like to show you a couple things that i found. First a video on driving a cd drive stepper motor with this chip http://www.hobbytronics.co.uk/h-bridge-driver-sn754410 and here is the video. I would just like to here your guys opinion.
CDRIVE
Hauling 10' pipe on a Trek Shift3
Josh, I watched the vid. Why do people make youtube vids only to whisper or mumble? That said the vid makes the point. One SN754410 will drive a single Bipolar stepper directly from a ParPort. It's looks like a good choice for your motors. Do you have a ParPort on your PC?
Chris
Chris
the laptop i am going to use doesnt have a 25 pin connector so could i use this http://www.ebay.ca/itm/New-USB-2-0-...rial_PS_2_Cables_Adapters&hash=item3cd2b52426 adapter?
Fish4Fun
So long, and Thanks for all the Fish!
Josh, I will again mention that using a Windows based computer to drive timing critical devices like stepper motors is going to be problematic. The Windows OS "time slices" and only does tasks during the allotted time slice. This means that if you send a series of bytes to the parallel port carefully spaced, in time, Windows will collect the bytes and then send them all at once as a packet. Neither your stepper nor your driver will be able to handle this. To make matters worse, the USB port and the USB Parallel Port Adapter interface are both buffered, meaning there are two more opportunities for the timing to get messed up. It might be possible to overcome some of this by sending "packets" of the same byte some number times and then sending the next step as another "packet" of the same byte, but this is going to become very frustrating. The board that you were looking at before MAY resolve these issues, but attempting to use JUST a USB to Parallel Port adapter on a windows based PC is going to be trouble.
Fish
Fish
CDRIVE
Hauling 10' pipe on a Trek Shift3
I don't know what happened to my reply but I did reply to this late last night. Anyway, previously USB/LPT adapters were not generic like USB/RS232 are. The USB/LPT adapters were sold with a list of printers, scanners, etc that they would support. Obviously this has changed because this adapter makes no mention of peripherals supported. The price of this adapter + shipping is so cheap I couldn't help ordering one for myself. I don't really need it but one can't have too many adapters. They're like tools. There's no such thing as having too many tools! Besides, I want to see if this adapter will take commands from VB.
Hi Fish. All good points but I don't think this is a deal breaker for Josh. He's currently standing at the start line of his stepper motor journey. I don't think any of his early experiments are going to require the dedicated processor cycles that you require in your CNC work. Are you suggesting that he restrict himself to DOS control? I think the last OS that required DOS to run Windows was W98SE. Subsequent windows releases run DOS as a console window and is not the underlying OS and is certainly not a genuine DOS OS. I would imagine that there are copious quantities of old DOS machines to be had for scrap prices though. On that note I used to love playing with QB4.5 but when I retired my W98SE PC for XP QB would suck my processor dry, so I don't use it any longer.
Chris
CDRIVE
Hauling 10' pipe on a Trek Shift3
Hey, I just found this on CNET. It allows the user to boot to DOS from a USB stick. Of course it will require a PC that recognizes a USB stick in the BIOS boot options. Most current PC's do.
http://download.cnet.com/DOS-on-USB/3000-2094_4-10795476.html
I still think that focusing on the OS at this point is just muddying the waters for Josh. He has enough issues to deal with already.
Chris
http://download.cnet.com/DOS-on-USB/3000-2094_4-10795476.html
I still think that focusing on the OS at this point is just muddying the waters for Josh. He has enough issues to deal with already.
Chris
CDRIVE
Hauling 10' pipe on a Trek Shift3
CDRIVE
Hauling 10' pipe on a Trek Shift3
Josh, I received your PM. You're bouncing off the walls here. Please wait for your board to arrive or contact the supplier to mail you the info you need to design the circuit before the controller arrives.
BTW, the only difference between a Bipolar & a Unipolar controller is that Bipolar steppers need a source and sink output to FWD/REV them. A Unipolar only needs the outputs to sink current to provide direction control. The ebay info didn't provide this data. if it did I missed it.
Chris
BTW, the only difference between a Bipolar & a Unipolar controller is that Bipolar steppers need a source and sink output to FWD/REV them. A Unipolar only needs the outputs to sink current to provide direction control. The ebay info didn't provide this data. if it did I missed it.
Chris
