Temperature sensor + Leds

Forum 2005-2010 (read only) Software Interfacing
26

Found something that may be useful

int extractDigit(int number, int place)
{
for(int i = 0; i < place; ++i) 
number /= 10; //get rid of the preceding digits
return number % 10; //now ignore all of the following ones
}

though this is C++

the key to extracting digits is using integer and modular division. You could directly access no. 9 in 1981 with (1981 / 100) % 10. The reason this works is that 1981/100 = 19, and 19 % 10 = 9.

Also found premade 7-segment script

#define NUM_DIGITS 4

// table of 7-segment patterns
const byte seg_def[] = // segment patterns for digits 0-9
{//GFEDCBA
B0111111, // '0'
B0000110, // '1'
B1011011, // '2'
B1001111, // '3'
B1100110, // '4'
B1101101, // '5'
B1111101, // '6'
B0000111, // '7'
B1111111, // '8'
B1100111 // '9'
};

byte digit_array[NUM_DIGITS];

void NumberToArray(word number)
{
char i;

// initialize all digits to the empty pattern (no segments lit)
for (i=0;i<NUM_DIGITS;i++) digit_array*=0;*

  • // extract each digit (right to left)*
    ** for (i=NUM_DIGITS-1;i>=0;i--) {**
  • // extract least significant digit as an index into the*
  • // segment pattern table*
    digit_array*=seg_def[number%10];[/b]
    __ // get next digit*
    ** number=number/10;**
    * // exit if there are no more digits to avoid leading zeroes*
    _ ** if (number==0) break;**
    }/for/
    }/NumberToArray/_
    [/quote]
    Ok, this goes out of hand. It is 01:07 at night, must go to sleep__