I have a project that’s been in the works for a while that needs one capacitive sensor. I’ve been using a dedicated device (AT42QT1011) and it meets my needs. I want an essentially unlimited sense time; the electrode is finger tip sized and can be close to the sensor pin.
Since I’m making my own PCBs I could move from the 328p centered approach that has been my path thus far and switch to the “b” variant that has built in touch sensing. The decrease in board complexity by eliminating the extra IC is attractive. I have one on order to test but in the mean time I’m wondering if anyone has done work with this device in self-sense mode using the Atmel library and if you think it works well enough to replace a dedicated sense chip. The documentation indicates that the QTouch features can be set to unlimited sense time. Have you encountered downsides?