BIMEcamp_7seg.ino

const int pinarray[7] = {12,13,7,9,8,11,10};
const int digitarray[10] =
    {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

void setup()
{
    for(int i=0; i<7; ++i)
        pinMode(pinarray[i], OUTPUT);
}

void light(char *digits)
{

    while(*digits)
    {
        // clear
        for(int i=0; i<7; ++i)
            digitalWrite(pinarray[i], LOW);

        //  main
        int dig = digitarray[*digits - '0'];
        ++digits;
        for(int j=0; j<7; ++j)
        {
            if((dig & 1) && pinarray[j])
                digitalWrite(pinarray[j], HIGH);
            dig >>= 1;
        }
        delay(500);
    }
}

void loop()
{
    char want[20] = "1234567890";
    light(want);
    delay(2000);
}