Light Sensor LED Brightness Control System with ATMEGA328 UNO V3.0 R3 for Arduino

By on June 17, 2015

Web site:

Project Summary:

ICStation team introduce you this light sensor LED brightness control system with our self-developed product ICStation ATMEGA328 UNO V3.0 R3 Board Compatible Arduino.It uses DC5V to work and it can change the brightness of highlight light emitting diode according to the light intensity of surrounding environment.It is a low-cost and simple lighting control system which can be used energy-saving lighting in the places such as passageway and road.

Full Project:

Functions of the system:

1.After startup, the analog light sensor will give a brightness of LED according to the light intensity of surrounding environment.

2.If the surrounding light becomes darker and darker, while the LED becomes brighter and brighter.

3.If the surrounding light becomes brighter and brighter, while the LED becomes darker and darker.

4.If the light intensity of surrounding environment is stronger than the analog output value which we pre-set in the program, the LED will go out.

Step 1: Connect the +5V Power Supply and GND of development board to the bread board

The red wire connects the power supply and the black wire connects the GND

Step 2: Connect the analog light sensor with 3P DuPont line

Connect the analog light sensor with 3P DuPont line and connect the pin to the another end of 3P DuPont line.

Step 3: Put the light sensor and LED on the bread board

Step 4: Connect the cathode and anode of components to the common terminal

Connect the power supply end and GND of the components to the common cathode and anode of bread board

Step 5: Connect the signal end of component to the development board

Connect the signal end of analog sensor and highlight LED light emitting diode to corresponding pins of the ICStation UNO R3 development board compatible with Arduino

Step 6: The video to show the effect



Circuit diagram:

Bill of Materials:

1.ICStation UNO R3 with USB compatible with Arduino
2.Bread board
3.Highlight LED light emitting diode
4.Analog light sensor
5.Hard jumper wire
6.4 PCS jumper wire
7. 5 Voltage DC power supply
8.3 PCS of pins
9.3P DuPont line


int _ABVAR_1_Bright;

void setup()


_ABVAR_1_Bright = 0;



void loop()


Serial.print( analogRead(A0) );  


 _ABVAR_1_Bright = analogRead(A0) ;   

analogWrite(3, map ( _ABVAR_1_Bright , 50 , 900 , 0 , 255 ) );

if (( ( _ABVAR_1_Bright ) < ( 50 ) ))  


analogWrite(3, 0);   





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