Colour sensor vivek

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Colour sensor vivek

  1. 1. Design of aColour Sensor By: VIVEK KR. SRIVASTAVA Roll No. 210403 Under the guidance of DR. S.K. MAHNA
  2. 2. OUTLINE: Objective Colour Theory System Introduction The Optical System The Electronic System Decoding Action Future Scope of the Project Applications
  3. 3. OBJECTIVE: To design a sensor which can detect light of different colours and is able to differentiate between them.
  4. 4. COLOUR THEORY: PRIMARY AND SECONDARY COLOURS: Primary colours are sets of colours that can be combined to make a useful range of colours. For human applications, 3 primary colours are usually used, since human colour vision is trichromatic. A secondary colour is a colour made by
  5. 5. PRIMARY COLOUR: Primary colour can be subdivided into: PRIMARY COLOUR ADDITIVE SUBTRACTIVE
  6. 6. ADDITIVE PRIMARY: An additive colour model involves light emitted directly from a source or illuminant of some sort. Combining one of these additive primary colours with another in equal amounts produces the additive secondary colours. Combining all three primary lights (colours) in equal intensities produces WHITE.
  7. 7. RGB COLOUR MODEL: An additive colour model in which RED, GREEN, and BLUE light is added together in various ways to reproduce a broad array of colours. Used in sensing, representation, and display of images in electronic systems, such as televisions and computers.
  8. 8. RGB COLOUR MODEL:
  9. 9. SUBTRACTIVE PRIMARY: A subtractive colour is based on absorption phenomenon. Each colour is caused by subtracting (that is, absorbing) some wavelengths of light and reflecting the others. This model explains the mixing of paints, dyes, inks, and natural colourants to create a full range of colours.
  10. 10. RYB COLOUR MODEL Primarily used in art and design education, particularly painting.
  11. 11. SYSTEM INTRODUCTION: LCOLOUR LIGHT I OPTICAL SENSORS SIGNAL G (Light To CODITIONING SOURCE H COMPONENTS OUTPUT (RGB) T Current) BLOCK DIAGRAM
  12. 12.  Light rays from a colour light source fall on the optical components of the Colour Sensor. The optical components filter and focus the rays on the optical sensors. The output of the sensors is processed by the electronic circuitry and the corresponding colour output is obtained.
  13. 13. THE OPTICAL SYSTEM: Convex lens Colour glass filterPhotodiode 10cm 10cm Hollow cylindrical pipes
  14. 14. OPTICAL COMPONENTSUSED: PHOTODIODE – (EG & G)  PIN Photodiode  Based on Photoelectric Effect  Converts Light to Current CONVEX LENS (f = 5cm)  Performs the task of focusing the light on the sensor.
  15. 15. OPTICAL COMPONENTSUSED: COLOUR GLASS FILTERS (Blue, Red, Green)  Allows only single colour wavelength to pass through it.  The optical filters used in the system are absorption filters.  It consists of colour media like colour glasses.
  16. 16. THE ELECTRONIC SYSTEM:
  17. 17. ELECTRONIC COMPONENTSUSED: PHOTODIODE Connected in Reverse Bias. Outputs current proportional to the incident light intensity(~20µA). OP-AMP –UA741 Connected as a trans-impedance amplifier. Converts current into voltage.
  18. 18. ELECTRONIC COMPONENTSUSED: DECODER – 74HC138  3 x 8 decoder Takes 3 inputs and gives 8 outputs VOLTAGE REGULATOR- IC 7805  Gives a fixed output voltage of 5 Volts  Need of the regulator?  The decoder IC operates on 2 to 6 Volts  The output of the op-amp can be as high as 12 volts
  19. 19. DECODING ACTION: INPUT OUTPUT A2 A1 A0 COLOUR(Green) (Red) (Blue) DETECTED 0 0 0 0 1 1 1 1 1 1 1 NO COLOUR 0 0 1 1 0 1 1 1 1 1 1 BLUE 0 1 0 1 1 0 1 1 1 1 1 RED 0 1 1 1 1 1 0 1 1 1 1 MAGENTA 1 0 0 1 1 1 1 0 1 1 1 GREEN 1 0 1 1 1 1 1 1 0 1 1 CYAN 1 1 0 1 1 1 1 1 1 0 1 YELLOW 1 1 1 1 1 1 1 1 1 1 0 WHITE
  20. 20. FUTURE SCOPE OF THEPROJECT The system can be modified to detect the colour of an object by sensing the light reflected by it. The system can be interfaced with a microcontroller to detect a wide range of colour shades.
  21. 21. APPLICATIONS: It can perform sorting operations: ◦ Avoids separation of medicines in pharmaceutical industries. ◦ Brick sorter ◦ In the recycling industry, sorting plastic by colour for recycling purposes. For eg. all the green 7-Up bottles down one conveyor, the clear on another and so on.

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