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Insight - Learn the Working of a Capacitive Touch Sensor

Table of Contents:

  1. Insight - Learn the Working of a Capacitive Touch Sensor
  2. Lock, Frame and Actuator
  3. Wire Connections and PCB
  4. Florescent Plate and Electrode

Written By: 

Vaibhav Jain


Everything in today’s digital devices world is becoming a touch away. Whether it is filling an early morning coffee mug or setting the timer for washing machine or turning ON the display of your PC. Capacitive Touch Technology is widely used in touch sensing devices. Less time response and environment adaptive features made it popular between the manufacturers. Some more applications are water purifiers, kitchen appliances, vending machines and switches.


Most of us have surely come across capacitive touch sensor in our day to day life but how many of us thought about the working principle behind it. Change in capacitance is used to sense the touch in capacitive display. Amazed? How can a two metal plate component which stores charge can sense the touch? Answer to the above question will be explored in this Insight.


Capacitive Touch Sensor: The picture above displays a capacitive touch sensor. Capacitive sensor is encapsulated by agood blackplastic material which holds IP67 rating. IP or Ingress protection rating system is a classification system showing the degree of protection from solid objects or liquids. In this the first number after P denotes that it is protected from dust and the second shows that it’s protected against the effect of immersion in liquid.

Touch Sensor pinouts

Pin out Terminals: Pin out terminals was visible onflipping it. These terminals are made from brass. The two separated terminals marked 1 & 2 are the LED terminals which glows on touching the sensor.The rest 3, 4& 5 are the supply voltage, ground and output terminals respectively.




what is actuator?


Actuator is a mechanical device which changes any form of energy to rotational.