Hi Yaroslav,
Some background about my tracking project is here: 1-Button Test: "Returning" During Meditation. The summary is that I decided to track “returning” instead of drifting. Since returning is a conscious action, it’s easier to notice than drifting. The instrument I used is the 1-Button tracker invented by @tblomseth and @jakobeglarsen. (This is not a commercial product, but a research prototype associated with our interest in understanding self-tracking at a fine level of detail.) If you want to try something similar, I have two options to recommend:
- I have an extra 1-Button I’m not using, I’d be glad to loan it to you. The 1-Button looks like this:

You press the blue button, which gives slight haptic feedback in the form of a vibration. Data is accessed by connecting via USB to a computer. The 1-Button appears as a drive, and the data file is data.csv. It will show a column of date/time records with each record formatted like this: 20200325T162232Z. The one I’m not using is an earlier version that has to be charged every few days. The current one I have going for my arrhythmia project is more efficient with energy use, but if you meditate once or twice a day the earlier version is perfectly adequate. Anyway, glad to figure out a way to get it to you if you want to go that route.
- Another possibility is using the puck.js along with @gedankenstuecke’s script that gives it similar behavior as the Totti Labs 1-Button. Bastian has a good description of the project here: Puck.js One-Button Tracker
Gary