Hello,
i have build a big 7 segment Display made of 11 “SparkFun 7-Segment Display 6.5"” they are all equiped with the " SparkFun Large Digit Driver" with the TPIC6C596 IC.
It is running fine untill I increment the number of digits over the 8th digit. As soon as I try to show 9 or more digits, the digits start to behave strange. No more counting. Some sporadic numbers.
What am I doing wrong?
Thanks for any help!
This is my code so far:
byte segmentClock = 6;
byte segmentLatch = 5;
byte segmentData = 7;
char snumber[10];
void setup()
{
Serial.begin(9600);
Serial.println("Large Digit Driver Example");
pinMode(segmentClock, OUTPUT);
pinMode(segmentData, OUTPUT);
pinMode(segmentLatch, OUTPUT);
digitalWrite(segmentClock, LOW);
digitalWrite(segmentData, LOW);
digitalWrite(segmentLatch, LOW);
}
unsigned long long number = 12345678901;
void loop()
{
showNumber(number); //Test pattern
number = number + 16;
number %= 100000000000; //Reset x after 99999999999
sprintf(snumber, "%llu", number);
Serial.println(snumber); //For debugging
delay(100);
}
//Takes a number and displays 11 numbers. Displays absolute value (no negatives)
void showNumber(float value)
{
unsigned long long number = abs(value); //Remove negative signs and any decimals
for (byte x = 0 ; x < 11 ; x++)
{
unsigned long long remainder = number % 10;
postNumber(remainder, false);
number /= 10;
}
//Latch the current segment data
digitalWrite(segmentLatch, LOW);
digitalWrite(segmentLatch, HIGH); //Register moves storage register on the rising edge of RCK
}
//Given a number, or '-', shifts it out to the display
void postNumber(byte number, boolean decimal)
{
// - A
// / / F/B
// - G
// / / E/C
// -. D/DP
#define a 1<<0
#define b 1<<6
#define c 1<<5
#define d 1<<4
#define e 1<<3
#define f 1<<1
#define g 1<<2
#define dp 1<<7
byte segments;
switch (number)
{
case 1: segments = b | c; break;
case 2: segments = a | b | d | e | g; break;
case 3: segments = a | b | c | d | g; break;
case 4: segments = f | g | b | c; break;
case 5: segments = a | f | g | c | d; break;
case 6: segments = a | f | g | e | c | d; break;
case 7: segments = a | b | c; break;
case 8: segments = a | b | c | d | e | f | g; break;
case 9: segments = a | b | c | d | f | g; break;
case 0: segments = a | b | c | d | e | f; break;
case ' ': segments = 0; break;
case 'c': segments = g | e | d; break;
case '-': segments = g; break;
}
if (decimal) segments |= dp;
//Clock these bits out to the drivers
for (byte x = 0 ; x < 8 ; x++)
{
digitalWrite(segmentClock, LOW);
digitalWrite(segmentData, segments & 1 << (7 - x));
digitalWrite(segmentClock, HIGH); //Data transfers to the register on the rising edge of SRCK
}
}