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Date:	Thu, 23 Apr 2015 18:43:49 -0400
Message-ID:	<CALSZ9gqAPj6h2Z_gLvHTBdL-cnQ6p_juTonjE0e+oDAaRy7KTQ@mail.gmail.com>
Subject:	Re: [geda-user] Stepper driver issues
From:	Rob Butts <r DOT butts2 AT gmail DOT com>
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com
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My application: I'm a quadriplegic and I want to get out in a kayak with my
kids.  I bought a small 12V trolling motor.  I raped the trolling motor
where I'm just using the shaft and propeller.  I have two joystick (one to
be mounted on each side of me).  I designed a controller board where one
joystick (only operable in the x-axis) shifts the trolling motor up through
the 5 forward gears or back through the 3 reverse gears.  This part works
great.

I'm using the stepper to turn the shaft of the trolling motor.  The
trolling motor shaft turns very easy by hand and is about 1 inch in
diameter.  My machinist mounted a 100 tooth gear to the trolling motor
shaft.  He then mounted the stepper with a 48 tooth gear on the trolling
motor (that's why I'm locked into the nema 23 size and footprint).

I only want the trolling motor to turn 180 degrees maximum.  I don't need
the stepper to run fast and since the torque is low (I went with the nema
23 just to be safe) the torque does not need to be high.  I have a 12V
marine battery that will be mounted in the kayak so my stepper voltage
supply will be 12V.
=E2=80=8B
From reading your reply I think I should be ok using the DRV8825.

What really erks me is that the stepper was working at one point with the
On Semiconductor STK682 driver and the circuit I designed.  I just don't
know what changed since that time.  It's been a while since then and I
spent six months in the hospital soon after that.

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<div dir=3D"ltr"><div>My application: I&#39;m a quadriplegic and I want to =
get out in a kayak with my kids.=C2=A0 I bought a small 12V trolling motor.=
=C2=A0 I raped the trolling motor where I&#39;m just using the shaft and pr=
opeller.=C2=A0 I have=C2=A0two joystick (one=C2=A0to be mounted on each sid=
e of me).=C2=A0 I designed a controller board where one joystick (only oper=
able in the x-axis) shifts the trolling motor up through the 5 forward gear=
s or back through the 3 reverse gears.=C2=A0 This part works great.=C2=A0 <=
/div><div><br></div><div>I&#39;m using the stepper to turn the shaft of the=
 trolling motor.=C2=A0 The trolling motor shaft turns very easy by hand and=
 is about 1 inch in diameter.=C2=A0 My machinist=C2=A0mounted a 100 tooth g=
ear=C2=A0to the trolling motor shaft.=C2=A0 He then mounted the stepper wit=
h a 48 tooth gear on the trolling motor (that&#39;s why I&#39;m locked into=
 the nema 23 size and footprint).</div><div><br></div><div>I only want the =
trolling motor to turn 180 degrees maximum.=C2=A0 I don&#39;t need the step=
per to run fast and since the torque is low (I went with the nema 23 just t=
o be safe) the torque does not need to be high.=C2=A0 I have a 12V marine b=
attery that will be mounted in the kayak so my stepper voltage supply will =
be 12V.</div><div>=E2=80=8B</div><div>From reading your reply I think I sho=
uld be ok using the DRV8825.</div><div><br></div><div>What really erks me i=
s that the stepper was working at one point with the On Semiconductor <font=
 face=3D"Arial" size=3D"2"><font face=3D"Arial" size=3D"2">STK682 driver an=
d the circuit I designed.=C2=A0 I just don&#39;t know what changed since th=
at time.=C2=A0 It&#39;s been a while since then and I spent six months in t=
he hospital soon after that.</font></font></div><div><br></div></div>

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