Using the schematic below, with a shift register and a 7 segment 4 digit display
ID: 3597933 • Letter: U
Question
Using the schematic below, with a shift register and a 7 segment 4 digit display(common cathode). Use the serial port to read an integer value. The range of numbers is [0,9999]. Display the value on the seven segment display.
Here is some starter code I am working with that has the display cycleing through intigers.
int latch=9; //74HC595 pin 9 STCP
int clock=10; //74HC595 pin 10 SHCP
int data=8; //74HC595 pin 8 DS
unsigned char table[]=
{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c
,0x39,0x5e,0x79,0x71,0x00};
void setup() {
pinMode(latch,OUTPUT);
pinMode(clock,OUTPUT);
pinMode(data,OUTPUT);
}
void Display(unsigned char num)
{
digitalWrite(latch,LOW);
shiftOut(data,clock,MSBFIRST,table[num]);
digitalWrite(latch,HIGH);
}
void loop() {
Display(1);
delay(500);
Display(2);
delay(500);
Display(3);
delay(500);
Display(4);
delay(500);
Display(5);
delay(500);
Display(6);
delay(500);
Display(7);
delay(500);
Display(8);
delay(500);
Display(9);
delay(500);
Display(10);
delay(500);
Display(11);
delay(500);
Display(12);
delay(500);
Display(13);
delay(500);
Display(14);
delay(500);
Display(15);
delay(500);
}
Explanation / Answer
int latch=9; //74HC595 pin 9 STCP
int clock=10; //74HC595 pin 10 SHCP
int data=8; //74HC595 pin 8 DS
unsigned char table[]=
{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c
,0x39,0x5e,0x79,0x71,0x00};
void setup() {
pinMode(latch,OUTPUT);
pinMode(clock,OUTPUT);
pinMode(data,OUTPUT);
}
void Display(unsigned char num)
{
digitalWrite(latch,LOW);
shiftOut(data,clock,MSBFIRST,table[num]);
digitalWrite(latch,HIGH);
}
int main(){
int i;
for(i=0;i<1000;i++){
Display(i);
delay(500);
}
}
/*
void loop() {
Display(1);
delay(500);
Display(2);
delay(500);
Display(3);
delay(500);
Display(4);
delay(500);
Display(5);
delay(500);
Display(6);
delay(500);
Display(7);
delay(500);
Display(8);
delay(500);
Display(9);
delay(500);
Display(10);
delay(500);
Display(11);
delay(500);
Display(12);
delay(500);
Display(13);
delay(500);
Display(14);
delay(500);
Display(15);
delay(500);
}
*/
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