Linistepper new board

[salvado]

Hi There

This is my small contribution to the world on homemade CNC.
Let me present to you my version of linistepper board.
It has new type of connectors and onboard 5 Volt regulator
Comments and sujestions are welcome .

[Fifty_ohm]

Very nice board layout. Did you use Eagle Layout for it or some other package?

[salvado]

Hi

No. Actually i`m not big fan of Eagle. I Prefer Proteus.

[James Newton]

Great board! I've added a link from the Linistepper user page.

For people who don't want to build thier own boards, and program thier own PIC, there is a full kit available at:

http://www.piclist.com/techref/io/st...step/index.htm

[salvado]

Hi There

After posting the drawings of the board i notice that there were small errors.
So if you`re planning to build one of these please use this revision.
My Apologies.
Thanks

[aferrier]

Hi Salvado,

I've just finished building your version of the LiniStep and having some issues getting it going properly. Are you able to publish your matching schematic?

I've build the posix version of this board and it works fine, but I like yours better because i can mount all three units against a single massive heatsink.

Thanks,
Alistair

[salvado]

Originally Posted by aferrier Hi Salvado, I've just finished building your version of the LiniStep and having some issues getting it going properly. Are you able to publish your matching schematic? I've build the posix version of this board and it works fine, but I like yours better because i can mount all three units against a single massive heatsink. Thanks, Alistair

Hi there

Here it is.Hope it is usefull.When i Had more time i intend to put some pictures of my board.

[aferrier]

Thanks Salvado! Really neat and tidy diagrams!

I see that the posix design uses a pair of 470 ohm resistors that you are missing, just like the original design... would you know what they're used for?

My posix board gives full tourqe to the motor, but I'm only getting correct, but weak pulses sent to the motor with your board.

EDIT: After reading the LiniStep FAQ... it was required to add these resistors as an afterthought. Looks like these have also been added to the original circuit.

[salvado]

Hi there

New revision of my linistepper board
Added the two "missing" resistors

[tomo6]

It's it working ? Anybody tested it ?

[aferrier]

I've built this design and also the Posix board... but I can't get Salvado's design working. Tested all components, replaced the PCB!, reprogrammed PIC and used 16F84A and 16F628 with no change and triple-checked stepper wiring connections and replaced all transistors. I still get noise or what seems interference/feedback when driving the motor. Here's a video example of one of my boards that work perfectly and one that doesn't. I really would prefer to get Salvado's working... better transistor placement and onboard 7805 is a real bonus.

Salvado Design Board with 470 resistor mod.. Motor has glitchy steps:



Posix Design Board... same schematic as above... motor is smooth:



I know there has to be a difference between the two board designs, but I'm completely at my wits-end to see what it may be. Any ideas on what to look for?

[salvado]

Hi there

I noticed that the value for the resistor connected to the MCLR of the PIC as the wrong value. It should be 1K or just a jumper.Right now i`m in processs of building a new PIC programmer (as mine as broken) so i`m not abble to assist in debugging.As soon as i have my pics programmed i will try to figure out what is going on.