Re: [CAD_CAM_EDM_DRO] Re: Proper pull up resistors for optical limits

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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