On Mon, 13 Apr 2015, andy pugh wrote:
> Date: Mon, 13 Apr 2015 16:37:50 +0100
> From: andy pugh <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] 7i73 Inputs
>
> On 13 April 2015 at 16:26, Rick Lair <[email protected]> wrote:
>> What would be the best course of action to utilize 0-7 for inputs like
>> this
>
> The simplest way to wire might be to take 0V and 5V to the switch, and
> either use a SPDT (Or do I mean DPST?) switch that actually swaps from
> 0V to 5V when operated, or pull-up to 5V through a 5k resistor at the
> switch and short the pin to 0V when the switch is operated. (Only
> because it is a bit fiddly to pull-up at the 7i73)
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
If you are going to use a SPDT switch, be aware that Inputs 0..7 are only 3.3V
tolerant so they should only be pulled up to 3.3V (5V will may damage the
7I73)
Peter Wallace
Mesa Electronics
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