Segue código que utilizei no projeto.
// O código original é o que está no link abaixo, fiz algumas adaptações para poder visualizar no display de sete seguimentos.
// Segue o código que adaptei. Janeiro de 2013
// Por: Marcelo Victorio.
//Pin connected to ST_CP of 74HC595
int latchPin = 8;
//Pin connected to SH_CP of 74HC595
int clockPin = 10;
////Pin connected to DS of 74HC595
int dataPin = 9;
////Pin Sensor Ultrasonic
#define trigPin 12
#define echoPin 13
//holders for infromation you're going to pass to shifting function
byte dataDISPA;
byte dataDISPB;
byte dataArrayDISPA[10];
byte dataArrayDISPB[10];
void setup() {
//set pins to output because they are addressed in the main loop
pinMode(latchPin, OUTPUT);
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
//Marcelo - 26/08/2012
dataArrayDISPA[0] = 0x3F; //00111111
dataArrayDISPA[1] = 0x06; //00000110
dataArrayDISPA[2] = 0x5B; //01011011
dataArrayDISPA[3] = 0x4F; //01001111
dataArrayDISPA[4] = 0x66; //01100110
dataArrayDISPA[5] = 0x6D; //01101101
dataArrayDISPA[6] = 0x7D; //01111101
dataArrayDISPA[7] = 0x07; //00000111
dataArrayDISPA[8] = 0x7F; //01111111
dataArrayDISPA[9] = 0x67; //01100111
dataArrayDISPB[0] = 0x3F; //00111111
dataArrayDISPB[1] = 0x06; //00000110
dataArrayDISPB[2] = 0x5B; //01011011
dataArrayDISPB[3] = 0x4F; //01001111
dataArrayDISPB[4] = 0x66; //01100110
dataArrayDISPB[5] = 0x6D; //01101101
dataArrayDISPB[6] = 0x7D; //01111101
dataArrayDISPB[7] = 0x07; //00000111
dataArrayDISPB[8] = 0x7F; //01111111
dataArrayDISPB[9] = 0x67; //01100111
//function that blinks all the LEDs
//gets passed the number of blinks and the pause time
blinkAll_2Bytes(2,500);
}
void loop() {
int duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if (distance >= 200 || distance <= 0){
distance = 0;
}
//load the light sequence you want from array
int jj = distance;
int x = jj%10;
int y = jj/10;
dataDISPB = dataArrayDISPB[y];
dataDISPA = dataArrayDISPA[x];
//ground latchPin and hold low for as long as you are transmitting
digitalWrite(latchPin, 0);
//move 'em out
shiftOut(dataPin, clockPin, dataDISPB);
shiftOut(dataPin, clockPin, dataDISPA);
//return the latch pin high to signal chip that it
//no longer needs to listen for information
digitalWrite(latchPin, 1);
delay(800);
}
// the heart of the program
void shiftOut(int myDataPin, int myClockPin, byte myDataOut) {
// This shifts 8 bits out MSB first,
//on the rising edge of the clock,
//clock idles low
//internal function setup
int i=0;
int pinState;
pinMode(myClockPin, OUTPUT);
pinMode(myDataPin, OUTPUT);
//clear everything out just in case to
//prepare shift register for bit shifting
digitalWrite(myDataPin, 0);
digitalWrite(myClockPin, 0);
//for each bit in the byte myDataOut
//NOTICE THAT WE ARE COUNTING DOWN in our for loop
//This means that 000001 or "1" will go through such
//that it will be pin Q0 that lights.
for (i=7; i>=0; i--) {
digitalWrite(myClockPin, 0);
//if the value passed to myDataOut and a bitmask result
// true then... so if we are at i=6 and our value is
// %11010100 it would the code compares it to %01000000
// and proceeds to set pinState to 1.
if ( myDataOut & (1<<i) ) {
pinState= 1;
}
else {
pinState= 0;
}
//Sets the pin to HIGH or LOW depending on pinState
digitalWrite(myDataPin, pinState);
//register shifts bits on upstroke of clock pin
digitalWrite(myClockPin, 1);
//zero the data pin after shift to prevent bleed through
digitalWrite(myDataPin, 0);
}
//stop shifting
digitalWrite(myClockPin, 0);
}
//blinks the whole register based on the number of times you want to
//blink "n" and the pause between them "d"
//starts with a moment of darkness to make sure the first blink
//has its full visual effect.
void blinkAll_2Bytes(int n, int d) {
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, 0);
shiftOut(dataPin, clockPin, 0);
digitalWrite(latchPin, 1);
delay(200);
for (int x = 0; x < n; x++) {
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, 255);
shiftOut(dataPin, clockPin, 255);
digitalWrite(latchPin, 1);
delay(d);
digitalWrite(latchPin, 0);
shiftOut(dataPin, clockPin, 0);
shiftOut(dataPin, clockPin, 0);
digitalWrite(latchPin, 1);
delay(d);
}
}
