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:Uploaded on Saturday 19th Nov 2016

ARM 7 Micro-controller based Color sensor for Textile Industries using LDR.

  • The project ideas is to have a low cost color sensor designed using a low cost sensor such as LDR.
  • Project uses the Arm 7 Micro-controller


Machines can perform highly repetitive tasks better than humans. Worker fatigue on assembly lines can result in reduced performance, and cause challenges in maintaining product quality, an employee who has been performing a repetitive inspection task may eventually fail to recognize a defective product. But automating many of the tasks in the industries may help to improve the productivity and product quality. On the other hand, the use of sensor technology will give the opportunity to the industry to employ more automated processes.

Industries today are approaching to use color sensor to fulfill their needs for a higher production and precise quality. Historically, components used for color sensing were considered expensive and required precision support circuitry, limiting their application mostly to specialized instrumentation. However, new technologies of color sensors with higher levels of integration are becoming available, allowing for more cost-effective solutions. As the number of applications using color sensing is increasing cost of color sensing comes down. Color sensors play a significant role in end equipment such as color-monitor calibration, color printers and plotters, paints, textiles, cosmetics manufacture and medical applications such as blood diagnostics, urine analysis, and dental matching. The complexity of a color sensor system is based largely on the number of wavelength bands, or signal channels it uses to determine color. Systems can range from a relatively simple three-channel colorimeter to a multiband spectrometer pump as per our requirements.

Components Required:

Below components can be used to implement the project.

  1. ARM 7 Micro Controller
  2. Regulated power supply unit
  3. Main Power supply
  4. White LEDs
  5. LDR to be used as color sensor
  6. DC motor
  7. Resistors
  8. IR Sensor
  9. LCD Display

Software which can be used:

Below Softwares can be used to implement this project idea. There are many other softwares which can be used, We donot recommend any, its left to users choice.

  1. Keil µVision
  2. Flash Magic or any other terminal softwares such as putty etc.
  3. Embedded C

Block diagram for the proposed project

HelpShareideas- Project ideas -Color sensor for Textile Industries using LDR using lpc 214x image
Fig 1: Block diagram of the proposed system.

Project Description:

The objective of the project is to design a simple, arm based color sensor circuit to identify different colors. In this project an LDR is used as the color sensor, which senses color intensity and converts into voltage with respect to the light intensity. This voltage is converted into the digital data using analog to digital converter. By this we can get selected compositions of the radiant light. By using this sensor we can find color of the object. The LDR detects each color and it gives different voltage levels. Analog to digital converter will take that voltage and convert it into digital form. These digital values are varying from color to color. If this color sensor is irradiant with any color, it produces different voltage outputs to the microcontroller then microcontroller compares the voltages to the different colors and displays the corresponding light color on LCD.

Applications of the project

  • Sorting automotive parts with different colors.
  • A manufacturer of automotive parts needs to differentiate parts whose only visible difference is a slight variation in color. One part is black, the other a dark grey. Because efficiency demands that the part be sorted at a high rate of speed, the opportunity for mistakes is extremely high. By using advance color sensing technology, the manufacturer can sort these parts at an enhanced rate of speed, saving time and virtually eliminating errors.

  • Assembly of medical closures with different color components.
  • In this situation, containers of liquid medications consist of an aluminum cap with a plastic cover. A complete closure assembly requires the assurance of proper color combination of two components. Because of this absolute necessity of color accuracy, color sensing technology proves invaluable.

  • Lumber sorting by color.
  • Color cording has become a standard method of differentiation in the lumber industry. Not only different types of lumber but the grade, quality and intended purpose of the lumber is indicated by color. Because the environments in which lumber is sorted can be highly abusive, it is recommended that protective covers be employed to protect the fiber optics used for this process.

  • Ammunition final inspection and sorting process.
  • An ammunition manufacturer codes the style and caliber of bullets with various colors on the tips. The need to insure that the proper type and caliber of product are correctly packaged necessitates the automation of the product line with color sensing technology. Because of the critical nature of this application, it is recommended that two color sensing stations be implemented to add an extra safety margin to the operation.

  • Color sensing in the food industry.
  • Sensing a white target on a white background is challenging using conventional photoelectric sensors. A manufacturer who needs to insure the presence of the white cap on a jar of mayonnaise improves accuracy with a color sensor that employs the RGB color concept. This technology improves the contrast between two slightly different whites.


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