christian l. / Mbed 2 deprecated lightdetector

Light detector with simple LDR and LCD display,there exist no calibration

Dependencies:   TextLCD mbed

main.cpp

Committer:
christian
Date:
2011-02-15
Revision:
0:f1db4613080a

File content as of revision 0:f1db4613080a:

#include "mbed.h"
#include "TextLCD.h"

TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3

AnalogIn Vin(p20); // 3.3V Vout - 4K7 resistor - pin20 - LDR -100 ohm resistor - GND

 main()
 {  
    while(1)  {
    int x = 0;
    
     for (int i=0;i<=100;i++){
     x = x + 1000*(1-Vin.read()); //build average from 100 values
     wait (0.01);
     }
    x=x/100;
      lcd.cls();
      lcd.printf("light intensity\n");
      lcd.printf("%d\n",x);     //value x is only relative,maybe anybody could calibrate it ? 
     
   }
}