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Last Updated

09/11/2003

 


30 LED Lambda Meter
Reprinted from: http://jobywbmeter.webhop.net with permission from the author Jonas Bylund.

 

I designed this 30-LED meter to use with my wideband lambda. ( http://www.diy-wb.com/ )

I wanted to have a slim meter to mount under the dash with only the row of LED's visible.

The voltage range is 1.5 Volts for rich ( Lambda 0.70 , AFR 10 ) to 3.0 Volts for lean ( Lambda 1.44 , AFR 21 ).

For reference I added two additional LED's that are lit all the time.
One green for Lambda 0.86 (Maximum power).
One yellow for lambda 1.05 ( Best fuel economy ).

I used green LED's between max power and max fuel economy.
I used yellow LED's above the max power LED and up to lambda 0.75 (AFR 11). That is the range used for supercharged vehicles.
I used red LED's for values leaner than the Best fuel economy LED and for values richer than lambda 0.75 (AFR 11).

 
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Click Here to see the meter in action
 
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Very rich
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Stoichiometric
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Very lean
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Author: Jonas Bylund

http://jobywbmeter.webhop.net

 

Copyright 2003. All Rights Reserved.