[Diy_efi] wideband O2 monitor

[Neil]

This is a serious undertaking. ?Wideband sensors don't just send an output 
that varies in some fashion to the AFR, but rather based on a feedback 
mechanism where a dynamically variable control current is sent to the sensor 
to balance the output at a specific level. ?The amount of control current is 
related to the AFR. ?But while this is happening, temperature must be very 
carefully maintained, as it significantly affects accuracy. ?The cheaper 
units monitor/control the temperature of the heater, while the better units 
control the temperature of the sensing tip. ?This of course means 
superimposing another signal on top of the control/output signal and 
filtering that out to isolate the temperature signal from the AFR signal.

Still want to do this? :-)

Get a commercial unit with an analog output (Innovate, PLX, Zeitronix, etc) 
and run that into a serial datalogger. ?Should cost around $200 to $225.

-Neil.



On Tuesday 10 October 2006 12:34, Mike Yates wrote:
> anyone here know of a wiring schematic and possibly some freeware
> drivers to monitor wideband O2 data via serial port?
>
> ...Yeah im cheap i know but i cant bring myself to pay between 3 and
> 600 dollars for something that's so simple as 0-5v.
>
> Mike
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