Batch buy of L6470 Stepper Driver Breakouts - London Hackspace

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Message from discussion Batch buy of L6470 Stepper Driver Breakouts
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From: Charles Yarnold <charlesyarn...@gmail.com>
Date: Fri, 28 Sep 2012 00:28:43 +0100
Message-ID: <CAHv7mDQj-COJ8bAvx8wJParnAJFtvyTZJfU23nNMjQaSd88...@mail.gmail.com>
Subject: Re: [london-hack-space] Batch buy of L6470 Stepper Driver Breakouts
To: london-hack-space@googlegroups.com
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Revising my design and looking at costing, I'm now thinking of making
it individual boards with chaining connectors, any thoughts, objections?

Sol

On 26 September 2012 17:59, Charles Yarnold <charlesyarn...@gmail.com>wrote=
:

> Hia,
>
> So I'm planning to ship fully soldered and tested boards.
>
> Everything is set via the spi link "All commands and data registers,
> including those used to set analogue values (i.e. current control
> value, current protection trip point, deadtime, PWM frequency, etc.) are
> sent through a standard 5-Mbit/s SPI." Its quite a nice chip.
>
>
> http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/D=
ATASHEET/CD00255075.pdf
>
> I also forgot to mention, the biggest reason to put multiple drivers on
> one board for me is that they can be chained for up to 8 steppers, meanin=
g
> that all of this is integrated in one board rather than jumping control
> wires between them.
>
> Sol
>
> On 26 September 2012 17:17, Simon Howes <simonhowes...@googlemail.com>wro=
te:
>
>> Hello Charles!
>>
>> Question: what form would this come in?  Would soldering be required or
>> would these  be lovely chairman Charles greatleapforward prefab pcbs? :)
>>
>> How would you foresee current  limit being set? Jumpers? Resistor?
>> Turnpot? Or is it all (including microstepping) controlled via software?
>>
>> (Also, i want 2x4 channel pls)
>> On Sep 26, 2012 5:13 PM, "Charles Yarnold" <charlesyarn...@gmail.com>
>> wrote:
>>
>>> Awesome, lots of interest! Will finalise the design and costing this
>>> week and post when the sign up sheet is on the wiki.
>>>
>>> Nick: There is a small saving being able to use the same board for
>>> differing amounts of drivers. (leaving non used slots unpopulated and
>>> jumpered) But its mostly personal preference to have them all on one bo=
ard.
>>>
>>> On 26 September 2012 14:59, Nick Johnson <arach...@notdot.net> wrote:
>>>
>>>> I'm interested, though I'd find 2 axis boards more useful. Is there
>>>> substantial shared overhead that makes it simpler or cheaper to make
>>>> multi-axis boards rather than smaller single-axis ones?
>>>>
>>>>
>>>> On Wed, Sep 26, 2012 at 12:37 AM, Charles Yarnold <
>>>> charlesyarn...@gmail.com> wrote:
>>>>
>>>>> Hello all,
>>>>>
>>>>> One of my upcoming projects is making my own pick and place and on my
>>>>> list of things to build for it are stepper motor drivers.
>>>>>
>>>>> After asking around I have settled on the L6470 stepper driver, it
>>>>> seems an awesome chip. It works over spi and all you need to do is te=
ll it
>>>>> where to go, it handles driving the stepper for the correct number of
>>>>> steps, acceleration, deceleration, correcting for missed steps, stall
>>>>> detection, homing switch control and a whole lot more.
>>>>>
>>>>> You can see more here: https://www.sparkfun.com/products/10859
>>>>>
>>>>> The snag is I need 10 of them, and at ~=A325 a pop its not cheap, so =
I'm
>>>>> going to make my own breakouts.
>>>>>
>>>>> Its looking like I can get the price down to ~=A311 each driver, with
>>>>> boards containing 3 and 4 drivers on each (3 drivers on a board being=
 ~=A333,
>>>>> 4 being ~=A344).
>>>>>
>>>>> Would anyone else be interested in buying some of these if I was to
>>>>> make a surplice, how many would you be interested in? If we get inter=
est I
>>>>> will get a fixed cost and pop up a wiki page for orders.
>>>>>
>>>>> Hugs,
>>>>>
>>>>> Sol
>>>>>
>>>>
>>>>
>>>
>

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Revising my design and looking at costing, I&#39;m now thinking of making i=
t=A0individual=A0boards with chaining connectors, any thoughts, objections?=
<div><br></div><div>Sol<br><br><div class=3D"gmail_quote">On 26 September 2=
012 17:59, Charles Yarnold <span dir=3D"ltr">&lt;<a href=3D"mailto:charlesy=
arn...@gmail.com" target=3D"_blank">charlesyarn...@gmail.com</a>&gt;</span>=
 wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hia,<div><br></div><div>So I&#39;m planning =
to ship fully soldered and tested boards.</div><div><br></div><div>Everythi=
ng is set via the spi link &quot;All commands=A0and data registers, includi=
ng those used to set=A0analogue values (i.e. current control value,=A0curre=
nt protection trip point, deadtime, PWM=A0frequency, etc.) are sent through=
 a standard 5-Mbit/s SPI.&quot; Its quite a nice chip.</div>


<div><br></div><div><a href=3D"http://www.st.com/internet/com/TECHNICAL_RES=
OURCES/TECHNICAL_LITERATURE/DATASHEET/CD00255075.pdf" target=3D"_blank">htt=
p://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASH=
EET/CD00255075.pdf</a></div>


<div><br></div><div>I also forgot to mention, the biggest reason to put mul=
tiple drivers on one board for me is that they can be chained for up to 8 s=
teppers, meaning that all of this is=A0integrated=A0in one board rather tha=
n jumping control wires between them.</div>


<div><br></div><div>Sol</div><div class=3D"HOEnZb"><div class=3D"h5"><div><=
br><div class=3D"gmail_quote">On 26 September 2012 17:17, Simon Howes <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:simonhowes...@googlemail.com" target=3D"=
_blank">simonhowes...@googlemail.com</a>&gt;</span> wrote:<br>


<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><p>Hello Charles!</p>
<p>Question: what form would this come in?=A0 Would soldering be required o=
r would these=A0 be lovely chairman Charles greatleapforward prefab pcbs? :=
)</p>
<p>How would you foresee current=A0 limit being set? Jumpers? Resistor? Tur=
npot? Or is it all (including microstepping) controlled via software?</p>
<p>(Also, i want 2x4 channel pls)</p><div><div>
<div class=3D"gmail_quote">On Sep 26, 2012 5:13 PM, &quot;Charles Yarnold&q=
uot; &lt;<a href=3D"mailto:charlesyarn...@gmail.com" target=3D"_blank">char=
lesyarn...@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">



Awesome, lots of interest! Will finalise the design and costing this week a=
nd post when the sign up sheet is on the wiki.<div><br></div><div>Nick: The=
re is a small saving being able to use the same board for differing amounts=
 of drivers. (leaving non used slots unpopulated and jumpered) But its most=
ly personal preference to have them all on one board.=A0<br>





<br><div class=3D"gmail_quote">On 26 September 2012 14:59, Nick Johnson <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:arach...@notdot.net" target=3D"_blank"=
>arach...@notdot.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
">





I&#39;m interested, though I&#39;d find 2 axis boards more useful. Is there=
 substantial shared overhead that makes it simpler or cheaper to make multi=
-axis boards rather than smaller single-axis ones?<div>
<div>
<br><br><div class=3D"gmail_quote">

On Wed, Sep 26, 2012 at 12:37 AM, Charles Yarnold <span dir=3D"ltr">&lt;<a =
href=3D"mailto:charlesyarn...@gmail.com" target=3D"_blank">charlesyarnold@g=
mail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">







Hello all,<div><br></div><div>One of my upcoming projects is making my own =
pick and place and on my list of things to build for it are stepper motor d=
rivers.</div><div><br></div><div>After asking around I have settled on the=
=A0L6470 stepper driver, it seems an awesome chip. It works over spi and al=
l you need to do is tell it where to go, it handles driving the stepper for=
 the correct number of steps, acceleration, deceleration, correcting for mi=
ssed steps, stall detection, homing switch control and a whole lot more.</d=
iv>









<div><br></div><div>You can see more here:=A0<a href=3D"https://www.sparkfu=
n.com/products/10859" target=3D"_blank">https://www.sparkfun.com/products/1=
0859</a></div><div><br></div><div>The snag is I need 10 of them, and at ~=
=A325 a pop its not cheap, so I&#39;m going to make my own breakouts.</div>









<div><br></div><div>Its looking like I can get the price down to ~=A311 eac=
h driver, with boards containing 3 and 4 drivers on each (3 drivers on a bo=
ard being ~=A333, 4 being ~=A344).</div><div><br></div><div>Would anyone el=
se be interested in buying some of these if I was to make a surplice, how m=
any would you be interested in? If we get interest I will get a fixed cost =
and pop up a wiki page for orders.</div>









<div><br></div><div>Hugs,</div><div><br></div><div>Sol</div>
</blockquote></div><br>
</div></div></blockquote></div><br></div>
</blockquote></div>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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