Subject:
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Re: How to measure the signal Voltage ?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 24 Feb 1999 23:14:19 GMT
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Original-From:
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Robert McCartney <robert@engrSTOPSPAMMERS.uconn.edu>
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Viewed:
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1196 times
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not knowing anything about the sensor, but guessing (hoping) that it
behaves like an open collector gate, this is what i would do--fool
with the sensor on the bench to determine how it works before i
let it near the HB.
1. power up the sensor, measure the voltage between output signal and
ground. if there is an active output (0-12 v, say), you should be
able to detect it--move some reflective thing near and away from the
sensor.
2. if there is a voltage out > 5v, you could use an optoisolator, ensuring
that the HB never gets more than 5v. this should be easy since the
HB has pullups tied to the inputs, but means an extra part.
3. if there is no signal out, add a pullup resistor from the signal to
high. now measure the range of output: it should be something like
0 to whatever the high voltage is (0 = detect, high = no detect).
if you use a 47k pullup to +5 v, you will see the range that the HB
sees, since the HB has 47k pullups to +5V. if that range is ok, then
you should be ok to simply hook the signal to the appropriate input
on the HB.
hope this helps.
r.
On Thu, 25 Feb 1999, phillip chia wrote:
> Hi Everybody,
> I am using the retroreflective sensor to an object . The sensor is came
> from Masushita NAIS brand name. It has 3 wires . ONe for the +ve supply ,
> one for the -ve supply, one for the output signal line. The sensor is using
> a NPN type. The voltage is 12V and current is not more than 320 mA
> operation. This sensor casn be tune in its distance according to the need.
>
>
> Question :
> 1) The signal line will plug into the handyboard on the digital or analog
> port. However, the port can only support 5V. If the sensor is operate at
> 12V, is there any HARM to plug the signal line into the port ? If YES,
> how should I prevent it?
>
> 2) How should I take measuremnt on the signal line using Multimeter to
> measure the output voltage before enter into the digital or analog port ?
>
> 3) Please enlighten me how to differentiate the differences between NPN and
> PNP type? Is there any significant ot use either one of them ?
>
> 4) Since the digital or analog ports support only 5V operation , can it
> support a 12V sensor to comply to the HD?
>
> rgds,
> phillip
>
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Message is in Reply To:
 | | How to measure the signal Voltage ?
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| Hi Everybody, I am using the retroreflective sensor to an object . The sensor is came from Masushita NAIS brand name. It has 3 wires . ONe for the +ve supply , one for the -ve supply, one for the output signal line. The sensor is using a NPN type. (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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