If you want to save IOs, you can use a multi pole switch and wire each pole
as one binary bit. This will save you from adding external logic encoders or
using one IO per switch position. For instance, if you have 4 switch
positions, you could use a 2 pole switch and wire each pole to count as a
binary bit. It usually doesn't cost much more for additional poles are
larger rotary switches, so this is usually an attractive solution.
www.digi-key.com also carry som rotary switches where you can set the number
of positions in the field. There is a ring that you adjust that limits the
rotational travel.
The latest HAL m5i20 driver code in EMC2 is using an updated FPGA firmware
image that has the secondary encoder pin out issue fixed. I'm pretty sure
this change was in at least the last release, if not the last two.
~petev
-----Original Message-----
Message: 3
Date: Sat, 07 Apr 2007 18:45:12 +0300
From: Anders Wallin <[EMAIL PROTECTED]>
Subject: Re: [Emc-users] Hardware Feedrate Override Control
To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Kasparov, Aram wrote:
> Hello Anders.
Hi Aram,
> I have questions about 6 position rotary switch and 4 position rotary
switch.
> Are they all one-pole type of switches or they need to be multi poles?
I guess 1-pole. There's a common terminal to which I bring +5V, and that
+5V is then switched to one of the 4 (or 6) outputs. There are pull-down
resistors on the inputs to make sure they are 0 V when there's no signal
connected to them
> About 4 Pushbuttons switches, are they all momentary type switches
(normally open)?
Yes. EMC uses 'nist-logic' (for each function: one button for on, one
for off, and a signal to indicate status) so momentary pushbuttons make
sense.
> How many this electronics devises " I first decode the differential
signals to
> single-ended ones using a DS3486
> <http://www.national.com/pf/DS/DS3486.html> ."
> do I need?
For one jogwheel that outputs differential signals (+A, -A, +B, -B) you
need one DS3486 to decode it to single-ended signals, just A and B
(relative to ground). As described on my blog (see link far below), the
connection is from the next to last page of:
http://www.irf.com/technical-info/refdesigns/dg-irmck201.pdf
> How many this type do I need "6-pos switch is encoded with an SN74HC148
> http://www.alldatasheet.com/datasheet-pdf/pdf/27887/TI/SN74HC148.html>
> into a 3-bit value." do I need?
You need one 74HC148 to decode the position of one 6-pos rotary switch
into a 3-bit code. Note that if you don't need to save pins it might be
easier to just wire each of the 6 outputs of the switch to separate
input pins.
> Can you also send some diagram of soldering/connecting DS3486 and
SN74HC148 into
> the circuit?
See above for the DS3486.
The 74HC148 is really simple, each of the 6 connections from the 6-pos
switch go to the inputs, and the three-bit output signal goes to inputs
on the m5i20.
Anders
_______________________________
>
> From: [EMAIL PROTECTED] on behalf of Anders Wallin
> Sent: Sat 2/24/2007 8:38 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Hardware Feedrate Override Control
>
>
>
>> Dear All,
>> I have the current EMC2 2.1.0. and a Mesa 5i20 board. How
>> can I implement a
>> hardware FRO control? And while I'm asking questions, can I use the 4th
>> encoder inputs
>> for a Handwheel or MPG?
>
> Hi David,
>
> I documented some of my jogwheel hardware and HAL code on my blog
> http://www.anderswallin.net/2006/11/jogging-emc2/
>
> adjusting feed override requires halui, but it's quite easy to do.
>
> If you have the 5i20 with the 'old' firmware then the secondary hardware
> encoders are broken (pinouts overlap), but with an MPG there's really no
> reason to use a hardware encoder counter, the HAL software encoder
> counter works just fine.
>
> Anders
>
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