Quote:
Originally Posted by Aussie
@ ztan thanks so much for the work you did in helping to create the flex fuel kit for the OFT community. I will be installing the OpenFlash/FFTEC XRP Flex Fuel Kit on the weekend and am looking forward to stress free flex fuel driving.
I am also currently building a simple Arduino based climate control system that will toggle the A/C on and off to maintain a user defined temperature for my 2013 FR-S. As that system will include a small LCD screen I was also wanting to display the current fuel ethanol percentage. I understand the output from the kit is a 0.5v to 4.5v voltage level. My question is:
Is there a formula between voltage and ethanol content that I can use? If it is a linear equation (EthanolPercentage = xV + y) I can easily find x and y by looking at the percentage displayed on the OFT with a couple of different fuel mixtures, if it isn't it will take a bit longer. I'm hoping this information is something you can share.
Thanks |
Hi mate,
The relationship is linear. You can either decode the frequency coming out of the ethanol sensor, or the voltage being sent to the ECU pin A35-20 from the sender. The relationship will be in the ROMRaider .xml file (multiplier + offset values under "Ethanol Sensor Scaling").
Hope everything works well for you.