This slide deals about Micro switches and proximity sensors with its types,uses and application

1. MICRO SWITCHES &
PROXIMITY SENSORS

2. MICRO SWITCHES
• This switches are also known as limit switches
used for safety purposes.
• It determines the presence and absence,
positioning, passing, and travel of object.
• It is electromechanical device consists of
actuator mechanically linked to set of contacts.

3. CONSTRUCTION
• This switches are industrial controlled
components manufactured with various type of
operators.
 lever type.
 Roller type.
 Whisker type.
• It is operated mechanically by the motion of
the operating lever.

4. TYPES OF SWITCHES

5. CIRCUIT DIAGRAM

6. APPLICATIONS
• Timing devices.
• Gantry cranes.
• Medical and dental.
• Manually operated devices.
• Toy robots.

7. APPLICATIONS

8. PROXIMITY SENSOR
• Proximity sensor in robot used to identify the
object or something near it.
• It mainly used to measure the distance between
the robot and object.
• Detect the presence of object with out any
physical contact.
• It have long functional life because absence of
mechanical parts.

9. TYPES
 Inductive sensor.
 Capacitive sensor.
 Ultrasonic sensor.
 Optical sensor.

10. INDUCTIVE PROXIMITY SENSOR
• Detects the presence of metallic objects.
• Operating principle is based on a coil and high
frequency oscillator ,creates a field in close
surroundings of sensing surfaces.
• When presence of metal, there is change in oscillation
amplitude. So the sensor
output is changed.

11. CAPACITIVE SENSOR
• Capacitive sensor is used to detect non-metallic
objects like (plastic ,wood and so on).
• It produce electrostatic field.

12. ULTRASONIC SENSOR
• Ultrasonic sensors use high frequency sound waves to
detect the object.
• It emits ultrasonic pulse and wait for echo based on
the distance is measured.
• Frequency of 40KHZ is common.

13. OPTICAL SENSOR
• The object is detected by the action of light beam
travelled.
• The light emitted by transmitter focus on the object
and reflects back, which is received by receiver.

14. THANK YOU