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project:laser_light_sensor [2015/06/26 02:14]
dp
project:laser_light_sensor [2015/07/14 13:17] (current)
dp [Light diffuser]
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 ====== Laser/light sensor ====== ====== Laser/light sensor ======
-Aim of the project is to build lightweight laser/light sensor that can be mounted on quadcopter and used for gaming purposes. Sensor reads environmental light level via LDR, and sets the threshold below it. Any significant change in the light level will trigger the LED-s. Sensor will be used for the Dronosphere workshop and performance.\\ +Aim of the project is to build lightweight laser/light sensor that can be mounted on quadcopter and used for gaming purposes. Sensor reads environmental light level via LDR, and sets the threshold below it. Any significant change in the light level will trigger the LED-s. Sensor will be used for the [[http://radiona.org/dronosfera-dronosphere/|Dronosphere]] workshop and performance.\\ 
-{{:draft:light_sensor_1.jpg?direct&100|}} +{{:light_sensor_1.jpg?direct&100|}} 
-{{:draft:light_sensor_2.jpg?direct&100|}}+{{:light_sensor_2.jpg?direct&100|}}
 ==== List of components ==== ==== List of components ====
   * 1 Arduino Uno (or Duemilanove with an ATmega328)   * 1 Arduino Uno (or Duemilanove with an ATmega328)
Line 17: Line 17:
  
 ===== Arduino ===== ===== Arduino =====
-It's recommended to test the circuit on Arduino first. You will have serial monitor available and you will be able to read LDR readings and further fine-tune the code or components.+It's recommended to test the circuit on Arduino first. You will have serial monitor available and will be able to see LDR values and further fine-tune the code or components.
  
 ==== Arduino schematic ==== ==== Arduino schematic ====
-{{:draft:ldr.png?direct&300|}}+{{:ldr.png?direct&300|}}
 ==== Arduino code ==== ==== Arduino code ====
  
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       delay(50);       delay(50);
     }     }
-    delay(3000);+    delay(1000);
     threshold = analogRead(LDR) - sensitivity; // set light sensitivity threshold     threshold = analogRead(LDR) - sensitivity; // set light sensitivity threshold
 +    delay(1000);
   }   }
   else   else
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 ===== ATtiny (shrinking the sensor) ===== ===== ATtiny (shrinking the sensor) =====
-Now that we have tested everything, we can port it to ATtiny microcontroller (tested on ATtiny45, ATtiny85), which has significantly smaller profile, its cheaper and works on 3V. +Now that we have tested everything, we can port it to ATtiny microcontroller (tested with ATtiny45, ATtiny85), which has significantly smaller profile, its cheaper and works on 3V. 
  
 ==== Programming an ATtiny with Arduino ==== ==== Programming an ATtiny with Arduino ====
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   * http://highlowtech.org/?p=1695   * http://highlowtech.org/?p=1695
  
-{{:draft:arduino_attiny.png?nolink|}}+{{:arduino_attiny.png?nolink|}}
  
 ==== Connect LDR, LED and power ==== ==== Connect LDR, LED and power ====
-{{:draft:attiny45-85.png?nolink|}}+{{:attiny45-85.png?nolink|}}
  
 ==== ATTiny code ==== ==== ATTiny code ====
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 #define LDR A1              // analog pin to which LDR is connected #define LDR A1              // analog pin to which LDR is connected
 #define LED 1               // pin to which LED is connected #define LED 1               // pin to which LED is connected
-const int sensitivity = 50; // setting the light sensitivity+const int sensitivity = 40; // setting the light sensitivity
  
 int LDRValue = 0;           // variable to store LDR values int LDRValue = 0;           // variable to store LDR values
 int threshold;              // light sensitivity threshold int threshold;              // light sensitivity threshold
-float voltage;              // variable to store voltage 
  
 void setup() void setup()
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       delay(50);       delay(50);
     }     }
-    delay(3000);+    delay(1000);
     threshold = analogRead(LDR) - sensitivity; // set light sensitivity threshold     threshold = analogRead(LDR) - sensitivity; // set light sensitivity threshold
 +    delay(1000);
   }   }
   else   else
Line 121: Line 122:
  
 ==== Stripboard ==== ==== Stripboard ====
 +Cut the these lines on the stripboard (this is underside view).\\
 +{{:light_sensor_stripboard_2.png?nolink&200|}}
 +
 +... and soldier all other components\\
 +{{:light_sensor_stripboard_1.png?direct&500|}}
  
 ==== Light diffuser ==== ==== Light diffuser ====
-Cover the LDRs with semi-transparent material to act as light diffuser. Doing this will make sensor sensitive over bigger area. Also leave enough space between LDRs and diffuser for light to spread. You can use ping pong ball for this.+Cover the LDRs with semi-transparent material to act as light diffuser. Doing this will make sensor sensitive over bigger area. Also leave enough space between LDRs and diffuser for light to spread. You can use ping pong ball, or ball from vending machine.
    
 ===== Tips ===== ===== Tips =====
project/laser_light_sensor.1435277686.txt.gz · Last modified: 2015/06/26 02:14 by dp