App note: Capacitive Multibutton Configurations
A capacitive mutibutton configuration application note from Microchip describing how to scan and detect button presses on more than 4 capacitive buttons.
This entry was posted in app notes and tagged app note, microchip.
This application note will discuss three different
approaches to implementing multiple touch buttons
using Microchip microcontrollers. The first approach
creates a simple 4 sensor system using the on-chip
4-to-1 analog multiplexers tied to the inputs of the
comparator module. The second approach expands
the 4 sensor system of the first approach, into a 10
sensor system by combining pairs of the original 4
inputs. The third approach creates an expandable
system, which relies on multiplexing additional
sensors through an external analog multiplexer.