>
> Okay, got my OOPIC working with 4X20 LCD. Next I need to know how to
> integrate a voltage reading from an I/O line. I need to read one
> voltage that is between 0-5vdc and another that is 0-60vdc. I see the
> object to do this but wonder about how to hook up the signal/hardware
> and how to create a string from the periodic reading of the line into
> a decimal I can send to the display. If you have links, great, I am
> not a very accomplished programmer. Thanks,
>
> Jeff K. Burbank, CA
Do you want to MEASURE the voltage or just DETECT it. To MEASURE it,
run it through an 22k resistor in series with a 2k resistor to ground
and measure the voltage across the 2k resistor. Now, that assumes
that the voltage can NEVER be more than 60V. The other thing you can
do is put a Schottky diode between the top of the 2k resistor (where
it joins the 22k resistor and the input pin) and the 5V power supply
to dump the excess voltage. The diode is oriented with the BAR end
toward the 5V supply so it forward biases (turns on) when the voltage
at the top of the 2k resistor reaches 5.2V To MEASURE the voltage,
run it into an A/D input and use the oA2D object.
If you want to DETECT it you can divide it as above and run it into
and IOLine and use oDIO. But, if detection is the goal, you should
consider an opto isolator instead of a set of resistors. Post back on
which you want to do.
>
> P.S. I am now using a USB to serial cable with my XP computer. I am
> using vers. 6 software. I will eventually want to connect to the
> parallel programming port because my application (not robot) will be
> connected to the RS-232 serial all the time. So, since my computer
> has no parallel port, is there any trick for this?
Yup! All you have to do is buy an obsolete computer with a REAL
parallel port. Not exactly what you want to hear but that's the way it is.
You can't even stuff an after-market parallel port in the computer
because most of the PCI stuff doesn't wind up at the proper address
for a real parallel port. You need an ISA port.
For what it's worth, www.overstock.com has refurbished 3 GHz Dell
computers with real ports, a smallish disk, 512 MB RAM and WinXP for
about $352 delivered.
Richard
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/oopic/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/oopic/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:oopic-digest@yahoogroups.com
mailto:oopic-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
oopic-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
No comments:
Post a Comment