Question

How many types the capacitive touch sensors are classified?

(a) 1 type

(b) 2 types

(c) 3 types

(d) 4 types

I have been asked this question in a national level competition.

My doubt is from Touch Sensor in chapter Sensors of IOT

Answer 1

Right choice is (b) 2 types

For explanation I would say: There are two types of capacitive touch sensors

1. surface capacitive sensing

2. Projected capacitive sensing

In surface capacitive sensing, an insulator is applied with a conductive coating on one side of its surface.

In projected capacitive sensing, the whole surface is not changed, but an X-Y grid conductive material is placed between two insulating materials.