The QTouch Library features a detect integration mechanism, which acts to confirm detection in a robust fashion. The detect integrator (DI) acts as a simple signal filter to suppress false detections caused by spurious events like electrical noise.
A counter is incremented each time the sensor delta has exceeded its threshold and stayed there for a specific number of acquisitions, without going below the threshold levels. When this counter reaches a preset limit (the DI value) the sensor is finally declared to be touched. If on any acquisition the delta is not seen to exceed the threshold level, the counter is cleared and the process has to start from the beginning. The DI process is applicable to a ‘release’ (going out of detect) event as well.
For example, if the DI value is 10, then the device has to exceed its threshold and stay there for 10 acquisitions in succession without going below the threshold level, before the sensor is declared to be touched.
|
Setting |
Variable name |
Data Type |
Unit |
Min |
Max |
Typical |
|---|---|---|---|---|---|---|
|
DI |
qt_di |
uint8_t |
Cycles |
0 |
255 |
4 |