Fuel Sensor

Under Development -Electronics designed. Code to be written
The concept is a generic replacement calibrate-able fuel sensor.
Uses a  pair of capacitive element controlling the frequency of an oscillator to determine the fuel level.
This is corrected for temperature variation and fuel composition (water or ethanol contamination) by the use of a reference element and a measurement element.Calibration is carried out by filling or draining to the required levels and connecting some jumpers – a micro is used to measure the frequency of oscillation against temperature and level and produce a compensated output through PWM scaled to drive most standard gauges.

Currently has diverted into a Fuelbot approach for fuel injected bikes –

that is measuring the injector accumumlate open time and hence the fuel flow from full tank.
This also allows calculation of the fuel economy and range to empty etc.

This is about to undergo testing on the bike – on the Dash meters –


Updates / Ongoing Evolutions

OBD Bridge V2

New version using the ESP32 as the core – combines the micro and bluetooth / wireless together into a single part and adds wifi support for the connection as a bonus.

Dash Meters

New set with a mnior change to some pin assignments to allow for more accurate timing on the fuel injector pulse – to improve accuracy of the fuelbot fuel gauge. in test on the 955i


  1. Ray-San

    just about got the new code finished on the OBD Bridge – but due to the lack of schmitt trigger inputs on the ESP32 need to do a new board version with schmitts on the tacho and speedo inputs …. what were they thinking…

  2. Ray-San

    OBD bridge new boards with schmitt triggers this week

  3. derek costello

    You show many different manuals for ignition replacement??? Which one should I purchase for a 1979 CX500 Honda that presently has non working (plated case) CDI ignition ????

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