The touchbars have three connections – Common, Normally Closed (NC), and Normally Open (NO). The ports of the AW60 microcontroller connect to the NO pins, since the touchbars are only relevant when closed. By leveraging the built-in resistors and pull-up activation of the microcontroller, pressing the touchbar results in logic 1 at the AW60, while logic 0 is received when the bar is open. This design minimizes leakage current to conserve power. In summary, the touchbar circuits integrate with the AW60 through the NO pins, allowing touchbar presses to be detected by taking advantage of the microcontroller’s pull-up resistors. This achieves touch sensing while reducing power consumption.
As a team we decided to add in rear touch bar sensors this is because we wanted it to be able to detect issue either from be hide or at the front in order to be able to achieve this we had to wire in the G14,G15 and ground as can be seen in the picture.
