Basic I/O question
Archiver
Posts: 46,084
Hi everyone! I have a couple of questions that I would appreciate
some confirmation with. First, my senior project has 3 sensors that
are all interfaced to the stamp thru parallel ADC's (Basic stamp
2p40). Say two of the sensors ADC's are wired to the mainio 0-15
pins. If I execute...
X=INL
Debug ?X
(1)Will X contain, and the screen display, the value of the 8 bit
adc data in decimal?
(2)Secondly, I've wrote a test program to turn on and off four
relays in sucession with pauses and debug commands in btween (to
test that the coresponding solenoids are working). The pin output
voltage from the stamp is @1.9 to 2.2 volts. The relays we are
using are made by NTE and are model#R45-ID30-5/6F. I'm not familiar
with them (or the Stamp really!), but do I need a line driver for
the stamp to trip the relays?
(3)Should the debug window on my laptop run in real time with the
Stamp?
Thanks for the help!
some confirmation with. First, my senior project has 3 sensors that
are all interfaced to the stamp thru parallel ADC's (Basic stamp
2p40). Say two of the sensors ADC's are wired to the mainio 0-15
pins. If I execute...
X=INL
Debug ?X
(1)Will X contain, and the screen display, the value of the 8 bit
adc data in decimal?
(2)Secondly, I've wrote a test program to turn on and off four
relays in sucession with pauses and debug commands in btween (to
test that the coresponding solenoids are working). The pin output
voltage from the stamp is @1.9 to 2.2 volts. The relays we are
using are made by NTE and are model#R45-ID30-5/6F. I'm not familiar
with them (or the Stamp really!), but do I need a line driver for
the stamp to trip the relays?
(3)Should the debug window on my laptop run in real time with the
Stamp?
Thanks for the help!
Comments
question, it is better that you don't drive the relays directly with the
microcontroller. Probably the simplest and cheapest way with the low
voltage relays that you have is to use a bipolar transistor with the
collector and emitter wired in series with the relay coil. And then wire
the base to your I/O pin, with the appropriate load resistor of course. If
you don't isolate the relay in some way from the microcontroller you could
run into problems. Specifically when the relay is deenergized and the
magnetic field is collapsing. Hope I could help.
Original Message
From: <mellwhead@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 11, 2003 9:24 PM
Subject: [noparse][[/noparse]basicstamps] Basic I/O question
> Hi everyone! I have a couple of questions that I would appreciate
> some confirmation with. First, my senior project has 3 sensors that
> are all interfaced to the stamp thru parallel ADC's (Basic stamp
> 2p40). Say two of the sensors ADC's are wired to the mainio 0-15
> pins. If I execute...
> X=INL
> Debug ?X
> (1)Will X contain, and the screen display, the value of the 8 bit
> adc data in decimal?
>
> (2)Secondly, I've wrote a test program to turn on and off four
> relays in sucession with pauses and debug commands in btween (to
> test that the coresponding solenoids are working). The pin output
> voltage from the stamp is @1.9 to 2.2 volts. The relays we are
> using are made by NTE and are model#R45-ID30-5/6F. I'm not familiar
> with them (or the Stamp really!), but do I need a line driver for
> the stamp to trip the relays?
>
> (3)Should the debug window on my laptop run in real time with the
> Stamp?
> Thanks for the help!
>
>
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mellwhead@y... writes:
> 2)Secondly, I've wrote a test program to turn on and off four
> relays in sucession with pauses and debug commands in btween (to
> test that the coresponding solenoids are working). The pin output
> voltage from the stamp is @1.9 to 2.2 volts. The relays we are
> using are made by NTE and are model#R45-ID30-5/6F. I'm not familiar
> with them (or the Stamp really!), but do I need a line driver for
> the stamp to trip the relays?
>
Do drive your relays, a popular IC is a ULN2003 Darlington array. Go to
Google and type in ULN2003 and you can download the spec sheet..
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]