DIY_EFI Digest V5 #40

[Andy Wyatt]

Re Rex's Qs on the LM3914

the LM3914 is a chip manufactured by National Semiconductor. It is a dot/bar
display driver chip - usually used to drive a ten segment LED bargraph. The
3914 is part of a family, and it specifically uses a linear scale. You can
set the maximum and minimum voltages it will read (which correspond to LED1
and LED10) by applying
voltages to external pins. You can also program either a dot (one LED only)
or a bar graph (all LEDs from 1 to n, depending on voltage applied). You can
hook one up the output of a standard O2 sensor which gives out the voltages
you mentioned, and the chip also has a 1.25V reference built in, so you can
program it to read 0 - 1.25V, which makes a pretty handy O2 display. There
was a construction project done in Silicon Chip magazine, November 1995. I
can give more details if required.

Hope this is of some help
Andy W :-D

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