I use an Innovate LC-1 wideband o2 sensor controller to monitor the Air Fuel Ratio on my Honda Accord F22A6 Turbocharged engine.
Innovate sells a guage for almost $200.00 which gives a numerical display of your Air Fuel Ratio(AFR).
As I have done most of the work on my car, I wanted a custom solution for the gauge also.
The design is a 18M2 which reads an auxiliary output from the LC-1, which can be configured to output any voltages 0-5v according to AFR, and displays the information graphically.
I use a readadc to read the 0-3.48v signal that I programmed the LC-1 to put out. The Voltage corresponds to an AFR. For very low AFR(Cylinder wash) I display only one or two leds and both the red and green sections are driven giving me an orange color. Safe AFR's are shown in green and once the AFR is in a region where detonation (PING) can occur under boost the display turns red.
It took some time to calibrate the display, but I have tried it on 2 different LC-1 controllers and it works great.
http://www.innovatemotorsports.com/products/lc1.php
The led bargraph was a fleabay job which will display red green or orange if both red and green are driven. Any bargraph will work, i just liked the tri-color option.
This project maxes out the pins available on the 18M2, but hardly touches the capabilities of the chip. A smarter person could probably have built it with and 08, but i don't have much Picaxe experience.
Innovate sells a guage for almost $200.00 which gives a numerical display of your Air Fuel Ratio(AFR).
As I have done most of the work on my car, I wanted a custom solution for the gauge also.
The design is a 18M2 which reads an auxiliary output from the LC-1, which can be configured to output any voltages 0-5v according to AFR, and displays the information graphically.
I use a readadc to read the 0-3.48v signal that I programmed the LC-1 to put out. The Voltage corresponds to an AFR. For very low AFR(Cylinder wash) I display only one or two leds and both the red and green sections are driven giving me an orange color. Safe AFR's are shown in green and once the AFR is in a region where detonation (PING) can occur under boost the display turns red.
It took some time to calibrate the display, but I have tried it on 2 different LC-1 controllers and it works great.
http://www.innovatemotorsports.com/products/lc1.php
The led bargraph was a fleabay job which will display red green or orange if both red and green are driven. Any bargraph will work, i just liked the tri-color option.
This project maxes out the pins available on the 18M2, but hardly touches the capabilities of the chip. A smarter person could probably have built it with and 08, but i don't have much Picaxe experience.
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