- Blog entry posted in 'Projects', October 18, 2015.
Made better timer, now that there is better time between digits (thanks for pointing that detail yesterday!)
7-segment is driven by 4543 decode and arduino wich does all the harder stuff
3I6_bhVRSSY
94782
code, feel free to use and tell possible improvements!
Code:
/*
remember resistors for display, if needed
4543 uno 7-segment uln2003
D4 11
D3 12
D2 11
D1 10
8-GND
8 7
9 6
10 5
11 4
1-vcc
2----------------7
3----------------6
4----------------5
5----------------4
6-gnd
7-gnd
8-gnd
9------------------------------A
10-----------------------------B
11-----------------------------C
12-----------------------------D
13-----------------------------E
14-----------------------------G
15-----------------------------F
16-GND
*/
int const t =1;
int count;
void setup()
{
DDRD = DDRD | B11111100; //Data direction register D, 0=input, 1=output: pins 4-7 output
DDRB = B00000011; // 8, 9 outputs
}
void loop()
{
PORTD = B11110000; //display 0
PORTB = B00000001; //turn on digit 1
picknumber(count / 1 % 10);
delay(t);
PORTD = B11110000; //display 0
PORTB = B00000010; //turn on digit 2
picknumber(count / 10 % 10);
delay(t);
PORTD = B11110000; //display 0
PORTB = B00000100; //turn on digit 3
picknumber(count / 100 % 10);
delay(t);
PORTD = B11110000; //display 0
PORTB = B00001000; //turn on digit 4
picknumber(count / 1000 % 10);
delay(t);
if (count > 9999) //reset after ''overflow''
{
count = 0;
}
else count++; //increment
}
void picknumber( int count)
{
switch (count)
{
case 0:PORTD = B00000000; break;
case 1:PORTD=B00010000; break; //1
case 2:PORTD=B01000000; break; //2
case 3:PORTD=B01010000; break; //3
case 4:PORTD=B10000000; break; //4
case 5:PORTD=B10010000; break; //5
case 6:PORTD=B11000000; break; //6
case 7:PORTD=B11010000; break; //7
case 8:PORTD=B00100000; break; //8
case 9:PORTD=B00110000; break; //9
}
}
