Correct Time accuracy for the reaction time test app

[Ren-jei]

I try to composite the Reaction time test app. I used the clock timer with timeintervals for 1. It seem works while it running but I found it had a big problem: time lag.
How could I do to correct this problem! The blocks were shown as attachment. 截圖 2021-10-28 下午12.21.00|690x356Reaction_time.aia (4.6 KB)

[NishyanthKumar]

There will always be some lag in the Clock component. You might want to try the suggestions in this topic:

Possible accuracy issues in clock timer

Hi I am trying to use the clock module as a timer to build a metronome. To test things out I set the timer to 1000s ms and each time the event occurs I play a sound (the sound mp3 file is about 100ms long) What I find is that when I compared to my computer's seconds clock, there is a lag in time. In other words, the AI2's clock timer seems to get out of phase with the computer's clock after about 50s. I am attaching the screen shot below [image] [image] Chandra

[ABG]

The trick here is not to try to show every millisecond.
Instead, use a global variable with Clock.SystemTime for the moment the red appears, and show the difference between current Clock.SystemTime and the saved SystemTime.

The app:

(Components renamed for my sanity)

Reaction_time_ABG.aia (4.1 KB)
Details:

[Ren-jei]

Thank you so much and appreciated what you have done. You really did me a favors. As you mentioned, the most important is to calculate the difference of time-points from system not the Clock timer. Thank you again!