Driving LED''s
Archiver
Posts: 46,084
Thank you for the only useful response. That sounds like a great
idea. Thank you very much.
- Nick
--- In basicstamps@y..., "FalconWireless Tech Support - KF4HAZ"
<techsupport@f...> wrote:
> First you will need to know if the display is common Anode or
common
> Cathode.
> Then select a "7 segment decoder/driver", I like the 9374 for
common anode
> types, it uses a 15ma constant current sink so no resistors are
needed, and
> it latches to hold the data on the display, plus bit patterns
$C$B$D$E
> spells out HELP, or $CBDD0 spells HELL0.
> Then there's the 9370 which will display in hexadecimal, it is
also common
> anode and latches.
> or the 9368 for common cathode with hex output, constant current
outputs,
> latching.
> or there is the TTL
> 7446,7447,7448,7449,74ls247,74ls248,74ls249,74ls347,74ls447
> and countless others including cmos devices.
>
> KF4HAZ Lonnie
>
>
Original Message
From: "naylor_nick" <naylor_nick@
>
> > Hello,
> > Here is the situation. I am trying to use a Basic Stamp to
> > drive a 3.5 digit LED display. Can this be done? I have no idea
> > how it coul dbe done. However, I do have an A/D converter IC
that
> > also has 3.5 digit drivers on it. That is controlled with a
> > voltage, 200mV max. Can the basic stamp output a certain
voltage on
> > a certain I/O line? Can anyone point me to a website that might
> > help me out?
idea. Thank you very much.
- Nick
--- In basicstamps@y..., "FalconWireless Tech Support - KF4HAZ"
<techsupport@f...> wrote:
> First you will need to know if the display is common Anode or
common
> Cathode.
> Then select a "7 segment decoder/driver", I like the 9374 for
common anode
> types, it uses a 15ma constant current sink so no resistors are
needed, and
> it latches to hold the data on the display, plus bit patterns
$C$B$D$E
> spells out HELP, or $CBDD0 spells HELL0.
> Then there's the 9370 which will display in hexadecimal, it is
also common
> anode and latches.
> or the 9368 for common cathode with hex output, constant current
outputs,
> latching.
> or there is the TTL
> 7446,7447,7448,7449,74ls247,74ls248,74ls249,74ls347,74ls447
> and countless others including cmos devices.
>
> KF4HAZ Lonnie
>
>
Original Message
From: "naylor_nick" <naylor_nick@
>
> > Hello,
> > Here is the situation. I am trying to use a Basic Stamp to
> > drive a 3.5 digit LED display. Can this be done? I have no idea
> > how it coul dbe done. However, I do have an A/D converter IC
that
> > also has 3.5 digit drivers on it. That is controlled with a
> > voltage, 200mV max. Can the basic stamp output a certain
voltage on
> > a certain I/O line? Can anyone point me to a website that might
> > help me out?