simple fuel consumption meter

11-16 — elektor november 1980 simpte fuel consumption meter A meter indicating fuel consumption while the car is moving would appear to be a popular circuit. The fuel consumption meter described in the April issue however suffered from a major disadvantage, unfortunately the transducers required could not be delivered. To remedy this the characteristics of all the transducers we could find were examined and on the basis of the results three "universal adaptation modules" were developed. With the aid of these modules it should be possible to use virtually every transducer! This article describes a simple version of a fuel consumption meter in addition to the modifications required to the "luxury" version. The basic principle is very simple, as illustrated by figure 1. Take two trans- ducers: one for speed and one for fuel consumption in mpg (flow transducer) using two interface modules. These are connected to a printed circuit board which takes care of the necessary scale divisio...