so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder inputs A
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for MOSI.
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
do i need to make sure the voltage don´t go above 3.3v? Because it says
SCK-5V and MOSI-5V
Am Mittwoch, 28. September 2016 02:01:14 UTC+2 schrieb Charles Steinkuehler:
>
> Why do you need a 3.3V regulator? The BBB supplies 3.3V which
> probably has enough current capacity to drive whatever I/O circuits
> you need to hook up.
>
> If you are referring to the eQEP0 inputs signals, if your encoder
> provides 5V signals (likely) you just need to make sure they never go
> above 3.3V. There are various ways to do this using FETs, level
> translator ICs, and many other solutions.
>
> If you do not need all the limit switch and SPI expansion signals on
> the CRAMPS board, the easiest thing to do might be to use the existing
> protection chip and wire the "clean" version of the input signals to
> more than one BeagleBone I/O pin. For instance, you could use the
> Z-Min and Z-Max inputs (on P502) for your encoder inputs, then connect:
>
> P9.11 (Z-Max) to P9.92 (eQEP0A_in)
> P9.13 (Z-Min) to P9.27 (eQEP0B_in)
>
> Make sure that P9.11 and P9.13 are setup as inputs, and set P9.92 and
> P9.27 to eqep inputs, and you should be good.
>
> On 9/27/2016 6:37 PM, Sag ich Dir nich wrote:
> > can i use a normal resistor to get 3.3v out of 5v or do i have to use a
> step
> > down voltage regulator, that outputs 3.3v and works with 4v? (when it is
> a
> > constant voltage of 5v, i could use a regulator but i dont know what to
> use for
> > signal because it is a frequency, not a constant) in case of a
> regulator, i
> > would use this
> > one:
> http://www.exp-tech.de/pololu-3-3v-2-6a-step-down-voltage-regulator-d24v22f3
> >
> > Am Sonntag, 25. September 2016 18:35:05 UTC+2 schrieb Charles
> Steinkuehler:
> >
> > On 9/25/2016 10:33 AM, Sag ich Dir nich wrote:
> > > Hi,
> > >
> > > does anybody know where on the CRAMPS board the eQEP0A_in (P9.92)
> and
> > eQEP0B_in
> > > (P9.27) pins are? (i mean the physical pins) I need them for an
> Encoder for
> > > Spindle control
> >
> > Schematics are online:
> >
> https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true
>
> > <
> https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true>
>
>
> >
> >
> > eQEP0A_in (P9.92):
> > SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with
> no
> > input protection, so make sure your signal is 3.3V or less).
> >
> > eQEP0B_in (P9.27):
> > FET3 on the CRAMPS board. This goes to the '244 buffer driving the
> > FETs, so you will need to wire directly to the P9 header. Again,
> make
> > sure the signal is 3.3V or less, and do *NOT* use the FET3 output
> (E1
> > heater) when running the encoder. You might even want to remove the
> > FET from the board.
> >
> > --
> > Charles Steinkuehler
> > [email protected] <javascript:>
> >
> > --
> > website: http://www.machinekit.io blog: http://blog.machinekit.io
> github:
> > https://github.com/machinekit
> > ---
> > You received this message because you are subscribed to the Google
> Groups
> > "Machinekit" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email
> > to [email protected] <javascript:>
> > <mailto:[email protected] <javascript:>>.
> > Visit this group at https://groups.google.com/group/machinekit.
> > For more options, visit https://groups.google.com/d/optout.
> >
>
>
> --
> Charles Steinkuehler
> [email protected] <javascript:>
>
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
---
You received this message because you are subscribed to the Google Groups
"Machinekit" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
Visit this group at https://groups.google.com/group/machinekit.
For more options, visit https://groups.google.com/d/optout.
