T3 Capacitive (touch) sensor data
Here are two graphs of the touch sensor reading, to check for drift over a period of 30 minutes. I think it looks pretty good. Each point on the graph is an average of about 4300 readings, taken over 0.5 seconds. The time is fixed, the number of readings varies depending on the value (higher capacitance = larger values = slower).
The first graph was from data taken at 7 am today, and the second graph is from 9 pm today, showing that the capacitive sensor reading did not drift much during the day (roughly, from 684.4 in the morning, to 684.5 in the evening). In the 9pm set there is a pk-pk amplitude spike of 24 counts at index 2834, for just one 0.5 second interval. Usually the pk-pk value is 7, 8 or 9. Maybe some random cosmic ray. It was not visible in the average value, so perhaps just one outlier data point.
Below: two graphs (which are apparently visible only if you are logged in)
EDIT: I see the forum resizes my barely-legible 800x600 graphs down to less than 350 pixels wide, sorry about that!
The top graph (blue) is averaged sensor value, which ranges between 684 and 685 counts. The middle (black) is the peak-peak deviation of each 4300 sample set, generally around 8 units. The bottom (pink) trace is the standard deviation of each set, generally about 1.6 units.