DIY-WB Mixture Display

[Glenn & Debbie Woodhouse]

Thanks Peter,

That is extremely helpful.  Now I am am going to let my "gear-head
intensive, EE deficient" ignorance shine through a bit with this next
question.  If you remap the transfer function for the NTK sensor using the
provided source code, how does a DIY'er reflash the PIC?  Do I need any
special hardware/software for my PC to do this.  I also probably have the
resources at work to do this but just don't know what is involved.

Glenn.

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Date: Sun, 26 Aug 2001 14:20:15 +1000
From: Peter Gargano <peter at techedge.com.au>
Subject: DIY-WB Mixture Display

I have generated some HTML with that info I mentioned about
the Silicon Chip Mixture Display kit (KC5300 by Jaycar). There
are a few other people who do the same kit, or you can get just
the PCB. Here's the first draft of that info:

  http://www.techedge.com.au/vehicle/FMD.htm

Given more time I'd have breadboarded the design and played with
a couple of component values (around VR2 & VR3) to get the 2.5
volt range DIY-WB requires.

Peter.
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Date: Sun, 26 Aug 2001 14:39:22 +1000
From: Peter Gargano <peter at techedge.com.au>
Subject: Re: DIY-WB Output Voltage Scaling

Glenn & Debbie Woodhouse wrote:
>
> A couple of questions for Peter and the group.  Peter, the display kit you
> recommend sounds perfect for our application.  I looked at the Jaycar info
> and it does not reference the supply of source code.  Did you buy one or
> talk to Jaycar to confirm this?

Perhaps I forgot to mention that the author of the original article
describing this kit is John Clark writing for Silicon Chip. the Software
is available from their site (see companion posting on "Mixture Display"
where i supply the link to the code).

> Has anyone played with the NTK box and determined if it produces a 0.5 V
bias?

Diode D11 (3-terminal adjustable shunt regulator) on the DIY-WB sets
the STOIC output voltage at 2.5 Volts. Change that reference voltage
and, within limits, the STOIC voltage will change.

Peter.


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