Introduction: Intel® Edison Hands-on Day 7: Luminous Treasure Box

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Luminous treasure box, the name sounds fun. And that would be real fun! We will make this box, which will be closed during the day, once in the night, its light will get brighter with the box opened slowly. Ha-ha...the inner workings of the box is that analog ambient light sensor can detect light strong or weak. With the brightness changing, the output values will be different. At night, to reach the set value, the servo will rotate, and LED turn on at the same time.

What you needed:

Step 1: Connection Diagram

TowerPro SG50 Servo → Digital 9

Analog Ambient Light Sensor → Analog 0

Digital Piranha LED Light Module - Red → Digital 3


Fixed the servo at the connection of the box, the LED in the box. Of course, the sensor is exposed to detect ambient light. After the installation is completed, place the box in the dark. And you can check if the box should open automatically.

Step 2: Example Code

#include     
Servo myservo;
int LED = 3;              //the number of the LED pin 
int val = 0;             //variable to store the sensor value
int pos = 0;
int light =0;
void setup(){
// initialize the digital pin as an output.
     pinMode(LED,OUTPUT);
     // initialize serial communication at 9600
bits per second: 
     Serial.begin(9600);         
     // attaches the servo on pin 9 to the
servo object
     myservo.attach(9);   
     // tell servo to go to position in 0
degree        
     myservo.write(0);          
}
void loop(){
     val = analogRead(0);     // read the input on analog pin 0
     Serial.println(val);    // print
out the value you read
     //Once smaller than the set value,increasing
angles    
if(val<40){  
          pos = pos +2;
          if(pos >= 90){  //After moverd to 90 degree, keep in this
degree
              pos = 90;              
          }        
          // tell servo to go to position in
variable 'pos'
          myservo.write(pos);   
          delay(100);
          // As the angle
increases, increased brightness LED
          light = map(pos,0,90,0,255);  
          analogWrite(LED,light);   //set the brightness 
     }else{                  
          pos = pos -2;    //minus 2 degree
          if(pos <= 0){
             pos = 0;       //reduced up to 0 degrees
          }
          myservo.write(pos);     
          delay(100);     
          light = map(pos,0,90,0,255); 
          analogWrite(LED,light);  
     }
}