By acquiring data in the form of an excitation - emission matrix (EEM), fluorescence spectroscopy is capable of analyzing multicomponent samples. However due to electronic limitations, earlier designed fluorometers are incapable of acquiring EEM data and new instruments which can acquire EEM data are relatively expensive. To circumvent this problem, an economical hardware interface was constructed, between an older analog fluorometer and a personal computer. The excitation and emission monochromators can now be electronically controlled, monochromator position continuously tracked, and detector output digitized so as to acquire EEM data in a reasonable period of time. Multicomponent EEM spectra of polynuclear aromatic hydrocarbons were acquired as a system test.