|30 led lambda meter|
|I designed this 30-LED meter to use with my widwband 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.
I used green LED's between max power and max fuel economy.