This special project is to study and design the Lux meter for Sun tracking system. By using the light-sensitive type of resistance that can change the electrical conductivity of the light. (The Light Department: LDR Resistor) used in measuring 5 mm in size, the number of 1 Lux, and tracking the Sun for 4 mm, 5 mm, the measurement used in the Lux serves and LDR changes the value of a resistance, which the application can be made to change the pressure values are calculated by the brightness value within the program and track the Sun used in the reception of the LDR, brightness and control. Servo motor which LDR each motion Motor direction 1. Used for motion control, 2 LDR, 2 directions and use Arduino MEGA 2560 microcontrollers is a program that helps to control command system, track the Sun system and Lux meter. From the test in this part of the test will be divided into three sections to test out a suitable resistance value. Sun tracking system testing. The test system measured Lux, which results from the tests found that the measured resistance value measured maximum brightness is the Lux and the resistance 127375 is 6.9 K Ω and Sun tracking system test, then by virtue of the principle of parallel beam, with the Sun so. The efficiency of the tool is a good tracking system by rotating Eli Sunday with precision and movement throughout the Sun between the hours of 9.00 Eli – 16.00 pm which is quite precise. The last part is the test measuring system, Deluxe, which compared to the value, calculated value of the Lux Lux from Lux meter and light intensity potentiometer ornamented fungal pioneer. Found to work properly and are suited to different applications which are useful to have in the future.
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