As the name suggests the Gravity Gesture & Touch Sensor from DFRobots offers both gesture recognition and touch detecting functionalities in a single module. The module offers a configurable gesture detection range with in 0-30cm.
TTP224 is a four-channel touch detector IC that could be used as a 4-touch key driver. It is a useful interface when replaced with a traditional button key.
TTP223 is a single channel touch detector IC that could be used as a 1 touch key driver. It is a useful interface when replaced with a traditional button key.
BS801B is a touch key controller with single key input. It is a very useful alternative to standard physical electronic or mechanical switches with a very low component count.
TTP229 is an 8 to 16-channel touch detector IC that could be used as an 8 to 16 touch key driver. It is a useful device when replaced with a traditional button key.