Electroencephalography (EEG) enables an understanding of brain functioning through the recording of its electrical signals. However, the components necessary for generating temporal marks, crucial for accurately timestamping when a subject receives a stimulus, are typically costly.This paper presents the development of a prototype designed for conducting EEG experiments while providing stimulus marks. The prototype is capable of receiving visual and auditory stimuli and offers haptic interaction through a switch button. It combines these signals into a unified stream, which is then transmitted to the EEG equipment.The processing hardware relies on the Very High-Speed Integrated Circuit Hardware Description Language (VHDL), implemented on Field Programmable Gate Arrays (FPGA). A test bench, utilizing PsychoPy in Python, was created to assess the prototype's performance. The flexibility of the prototype allows researchers to fine-tune its settings, offering a cost-effective solution to the research community for conducting EEG experiments with heightened confidence in temporal analysis.