Re: Proper pull up resistors for optical limits

Harvey,

Thanks so much for your help and info!!!

Frank

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
wrote:

> On Fri, 14 May 2004 02:49:39 -0000, you wrote:
>
> >The wiring diagram shows the resistor on the output side where

the

> >+5V comes off the connector pin (#4) on the servo amp,... it

shows

> >the resistor between the +5V output and the optical interrupter,
> >then from the optical interrupter it goes back to the isolated
> >ground on the connector on the servo amp (pin #6). The other

side

> >of the interrupter gets connected to limit in pin (#5) and then

to

> >the isolated ground (#6).
> >
> >On the optical switch: Pin 1= Anode, Pin 2= Cathode, Pin 3=
> >Collector, and Pin 4= Emitter. I'm unsure which gets connected

to

> >+5V, Ground, and Limit in, but I'm hoping there will be some
> >instructions with the switch. I'm very newbee to all of this.
>
> Pin 2 is to ground, pin 1 is to about 470 ohms or so, which is then
> connected to +5 volts, this puts 10 ma through the diode which

should

> be enough, a 1K resistor from pin 3 to +5 is fine, pin 3 becomes

the

> output (goes to logic 1 when at limit, beam interrupted), and pin

4 is

> ground, or a separate ground if you want isolation. IF you want
> isolation, then the +5 that the 1K resistor goes to is common to

the

> computer, and nothing else, the ground for pin 4 is the computer
> ground.
>
> Pins 1 and 2 can be fed from the 5 volts on the motor driver

circuit.

>
> This whole thing behaves like an opto isolator, so you get

isolation.

>
> Harvey
>
>
> >
> >Hope that helps to make it a little clearer on what size resistor

I

> >need. Thanks
> >
> >Frank
> >
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
> ><rtellason@b...> wrote:
> >> On Thursday 13 May 2004 10:16 pm, fun2b432002 wrote:
> >>
> >> > They show a resistor between the +5V and the optical

interrupter

> >switch but
> >> > do not give a value on the resistor.
> >>
> >> That's probably because the correct value for the resistor

depends

> >on the opto
> >> device...
> >>
> >> > I assume this is a pullup resistor (I know very little about
> >this) and I'm
> >> > wondering if anyone can help me with determining which size
> >resistor to
> >> > use????
> >>
> >> Sure.
> >>
> >> > The optical switches are transistor output type, Min Output

0.5

> >IC @ 20 mA
> >> > IF. Another type I may use are the same except Min Output

1.8

> >IC @ 20 mA
> >> > IF.
> >>
> >> I'm a little unclear here -- are you talking about connecting

the

> >resistor on
> >> the input side or on the output side?
> >
> >
> >
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