what is the THRESHOLD_BUTTON mean in csense?

[Royce]

Hello,

I am working on nrf52833 using the soft device s140 ble with csence enabled.

but the cap button has problems to detect signal, what is the 

THRESHOLD_BUTTON 400 mean?  and what is the unit of 400?

the code was from nRF5_SDK_17.0.2_d674dde/examples/peripheral/csense

/* Threshold values for pads and button. */
#define THRESHOLD_PAD_1         400
#define THRESHOLD_PAD_2         400
#define THRESHOLD_PAD_3         400
#define THRESHOLD_PAD_4         400
#define THRESHOLD_BUTTON        400

 We hope for your reply

[run_ar]

Hi,

Not sure exectly what the unit is. But regardless you need to do some calibration of the thresholds. There is a small description here: Capacitive Sensor Low-level Example