How to send triggers in a resting state EEG study


I want to record resting EEG activities. At first, my PsychoPy program sends triggers at the beginning of an eye-closing session (about 2 mins). However, sometimes the first trigger of the first session gets lost. So I want to send triggers every 2s during EEG recording. As I am new to PsychoPy, I have no idea how to make this.

I really appreciate any help on this.