Light sensor not detected

Light sensor seems to do not work when playing flashes in the monitor?
Have tried to adjust the sensitivity of light sensors from 1-100. But no LED was ever on.

Which StimTracker generation are you using? 1 or 2? You can tell by looking at the label on the bottom. It will say either ST-100 or 2G.

Hi…i think you’re misunderstanding how the sensor works. The low threshold is active when any light is on the sensor, and the high threshold is active when a lot of light is on the sensor. In total darkness neither is active. If you want to detect darkness use a NOT gate with the low threshold output.