An Implementation of Illuminance Meter Using Light Dependent Resistor Integrated with Labview Program


  • Jassada Sarasook Department of Teacher Training in Electrical Engineering, Faculty of Technical Education King Mongkut’s University of Technology North Bangkok, Bangkok, 10800
  • Chaiyapon Thongchaisuratkrul Department of Teacher Training in Electrical Engineering, Faculty of Technical Education King Mongkut’s University of Technology North Bangkok, Bangkok, 10800


Lighting system, Light distribution, Illuminance meter, LDR, Labview


This research presents design of illuminance meter by applying light. This research presents the design of an illuminance meter by applying a light dependent resistor (LDR) for light distribution testing. The luminance value is displayed on the Labview program. In order to calibrate the proposed illuminance meter, seven types of lamp were examined. A black testing room measuring 1.5m x 1.5m x 1.5m in size was constructed with steel structure and plywood. A stepping motor was used to rotate the light from -90 to +90 degrees in order to investigate the light distribution. The driver of the motor was controlled through the Labview program. The LDR was applied to measure the illuminance and the Labview program was used to display the value. The proposed illuminance meter was calibrated with a standard digital illuminance meter. The test was done five times for each type of lamp. According to the experiment, results showed that the proposed illuminance meter could measure at the range of 0- 900 lux. The average error was 4.42% with a standard deviation of 4.85. A high error occurred at low luminosity and it decreased when luminosity levels increased.


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