Touch sensor and Types

touch sensor types and uses

1. TOUCH SENSOR Presented By: 1. J.AJITHA (962718105001) 2. K.PETCHIAMMAL (962718105008) 3. RAMAJEYAM (962718105011 ) GUIDED BY Prof. S. Balaganesh M.E Electrical & Electronics Engineering

2. ABSTRACT 01 CIRCUIT DIAGRAM 02 CIRCUIT DESIGN 03 DESIGN AND COMPONENTS 04 CONTENT LED 05 PIEZO - BUZZERS 06

3. 9V BATTERY 07 WORKING PRINCIPLE 08 ADVANTAGE 09 DISADVANTAGE 10 CONTENT APPLICATION 11 RESULT 12

4. ABSTRACT 2019 2016 A touch switches apparatus for detecting the presence of an object such as a human appendage, the apparatus  having  a  switch  and  a  local  control  circuit  connected to the switch and to a controlled  device. The control circuit is preferably in integrated circuit form Electronic on / off switch for a  load  connected  to an ac supply  network, including a controlled semi conductor switch connected in a series circuit with the load, control circuit.  

5. CIRCUIT DIAGRAM This kind of sensor switch is suitable for making touch operated bells, buzzers of small toys which operate for a small time and then switch off automatically.   The input impedance of the trigger is very high and the touch sensor switch can be triggered by the voltage induced in the human body. The relay is a 12 V DC relay operating at currents less than 200 mA .   Just need to touch the metal plate and the relay gets energized and is kept in this state for about 100 seconds, then it's released . CIRCUIT DESIGN

6. DESIGN AND COMPONENTS

7. DESIGN AND COMPONENTS

8. LED Those blink things. A must have for power indication, pin status, opto - electronic sensors, and fun binky displays. This is a basic 5mm LED with a green lens. It has a typical forward voltage of 2.0V and a rated forward current of 20mA. Green and solid light indicates that the battery is charged and that the sensor is switched on, but not connected.

9. PIEZO - BUZZERS sound generators Piezo buzzers With driver circuit 80 up to 85 up Low current consumption Clear and intense sound Built - in drive circuit Extended operating voltage range

10. 9V BATTERY 9v battery is a common size of battery, that was introduced for the early transistor radios. It has a rectangular prism shape with rounded edges and a polarized snap connector at the top .

11. WORKING PRINCIPLE A touch sensor works like a switch, where when there’s contact, touch, or pressure on the surface of a touch sensor, it opens up an electrical circuit and allows currents to flow through it. These sensors are sensitive to any pressure or force applied or touch. The principle of touch is similar to that of a switch. When the switch is closed, the current flows otherwise there is no chance of the current to flow. Similarly, when the touch sensor senses the touch or proximity is captured then it acts like a closed switch otherwise it acts as an open switch.  These sensors are also known as ‘Tactile Sensors’.

12. It will be damage if the input DC voltage go  over 15V .   Unexpected alert , i.e accidental alarm   Doesn't provide wireless control to system The switch can be used for switching AC as well  as DC.   It is best to use a 9V12V DC regulated or  unregulated power supply.   It is used in various applications due to its  quicker  response . Low cost ADVANTAGE DISADVANTAGE

13. APPLICATION  This is ideally useful for making touch operated door bells , buzzer , toys etc .  It also used in door knobs & in relays .  Use this project to make remote operated switch ,  Light operated  switch & clap switch .

14. RESULT We can turn on almost any electrical device with this switch & the switch automatically turns off a short  time later. It is used  invarious  applications because of its quicker response.  It is  verysimple . The switch also contains an additional general function. By  touchingseveralsurfaces  simultaneously or within a predefined time, the additional function can be activated.  This invention concerns a  multipletouch  switch for operating  lighting,this  is in contrast to the  currentsystems  in which only a single button  ina  multiple switch  canbe  used  toturn  lights on or off or  inwhich  a separate button for  each light  circuithas  to be pressed.