Hi,

just to make sure, have you checked if your BOB has open collector outputs. If 
so you need to supply a pull-up resistor between output and +5V and the output 
needs to be defined inverted.

Br, Andreas

Dr. Andreas O. Lindner

Lindner TAC

Auhofstraße 11 B / 11
1130 Wien
Austria

Fax: +43 1 877 68 73
Mobil: +43 664 41 24 742

Email: a.lind...@lindner-tac.at
Web: http://www.lindner-tac.at



> Am 15.05.2020 um 13:31 schrieb Dan Henderson <luvtof...@gmail.com>:
> 
> I was just testing any pin. I have two BOB’s connected to two parallel
> ports. All my steppers are working on BOB zero.  No issues with any of
> that. BOB “1” has spindle-motion-reverse => paraport.1.pin-04-out. From
> this BOB I have both + and - 5v going to Inputs of external relay along
> with output of pin 04. By issuing M4, I assumed would get a click or
> trigger from external relay? This could also have been setup for
> coolant/air or any external device. I have not connected anything to the
> business end of the relay. Not sure if that would matter.  Also, the BOB is
> powered by USB not sure if that matters. I have the ability to power it
> with an external 5 volt source as well.
> 
> On Fri, May 15, 2020 at 3:59 AM andy pugh <bodge...@gmail.com> wrote:
> 
>> On Fri, 15 May 2020 at 01:33, Dan Henderson <luvtof...@gmail.com> wrote:
>>> 
>>> Hello everyone, I have a simple question for you. I’m testing the ability
>>> to trip a simple 5v relay with an output pin from a 5 axis BOB and don’t
>>> seem to be having any luck. I have motion-spindle-reverse mapped to the
>>> output pin (04).
>> 
>> When you say "pin (04)" do you mean parallel port pin 4 or BoB pin 4?
>> BoB Pin 4 is a limit input, connected to parport pin 13, and is an
>> input not an output.
>> 
>> Parallel port pin 4 is connected to the STEPY output, and I suspect
>> you need that for moving your Y axis?
>> (If not, then it probably should work)  It looks like the relay board
>> probably needs a 5V supply in addition to the logic and gnd
>> connections.
>> 
>> --
>> atp
>> "A motorcycle is a bicycle with a pandemonium attachment and is
>> designed for the especial use of mechanical geniuses, daredevils and
>> lunatics."
>> — George Fitch, Atlanta Constitution Newspaper, 1912
>> 
>> 
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