18 Jun
2004
18 Jun
'04
1:50 p.m.
On Fri, Jun 18, 2004 at 08:13:01PM +0100, Tony Duell wrote:
Let me see if I understand this. You have a digital
value (system usage),
on a digitial machine (the linux box). You convert it to analogue. You
then re-convert it to digital with a very low-res ADC (the LM3914 (I
guess) bargraph chip. Why not just output a suitable value on the
parallel port (which has 12 output lines IIRC) to directly drive the LEDs
(the 3914 drives 10 LEDs at most).
It's to drive _2 sets_ of 15 or 16 LEDs from _8 bits_, since the BeBox
is a dual-processor box.
And, yes, the LM3914 sounds about right.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 19-Jun-2004 01:40 Z
South Pole Station
PSC 468 Box 400 Temp -74.2 F (-59.0 C) Windchill -113.5 F (-80.90 C)
APO AP 96598 Wind 12.3 kts Grid 074 Barometer 682.6 mb (10528 ft)
Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html