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Re: O2 Sensor monitors
- To: quattro <firstname.lastname@example.org>
- Subject: Re: O2 Sensor monitors
- From: Dave Lawson <email@example.com>
- Date: Fri, 24 Feb 95 11:03:00 mst
- Encoding: 32 TEXT
- Reply-To: quattro
- Sender: quattro-owner
>You are right Scott ... there really isn't that much to making an O2 sensor
>monitor display. I haven't checked lately, but National Semiconductor used
>to make an IC that would drive a bar-graph display based on an analog input
We have designed one using the national chip and a 10 segment LED display.
Never got around to using that one though. I now have an Air/Fuel LED
bargraph which I bought from JC Whitney for around $30. It is made by
Cyberdyne and works fairly well. Comes in a VDO size round gauge housing
whose face is black until it is powered. It is simple to hook up, 3
wires12V, Gnd and O2 voltage. It is designed with the high impedance input
and it doesn't affect the O2 signal going to the ECU.
Also about a year ago there was an article in the UK magazine Fast Car(I
think this was the title) which had a DIY article on building one of these
LED meters. They found a 10 segment LED display which had the national chip
built into the card. All they did was to tweek the input signal and the
thing was working. Pretty neat.
>Glen, it sounds like you may have one of these doo-dads in your car. What
>sort of things do you notice while you drive?
I wanted one to watch and verify that I was running on the rich side when
the boost is cranked up. I now know I am in the rich range under boost and
have only seen it go into the lean range while crusing and idling.
Dave Lawson firstname.lastname@example.org