/* 7 Seg Pin Setup for 4 Dig 16 Pin YoungSun Display
https://www.instructables.com/Arduino-Ultrasonic-Distance-Meter-With-7-Segment-D/
Pin  Display Arduino
D1    1     13
D2  2     12
D3  6     11
D4  8     10
a   14      2
b   16      3
c   13      4
d   3     5
e   5     6
f   11      7
g   15      8
*/

/*

*** IMPORTANT BE SURE TO ADD  SevSeg.h  LIBRARY TO THE LSIT OF INCLUDED LIBRARIES IN THE ARDUINO IDE ***

*/

#include "SevSeg.h" // library for 4 dig 7 seg display <<< ADD LIBRARY
SevSeg sevseg; // initiate display

// set ultrasonic pins to global variables
int trigPin = A1;
int echoPin = A0;

int cm; // variable to be read by the display
int interval;


void setup(){

Serial.begin(9600);

pinMode(trigPin,OUTPUT); //set pin to output
pinMode(echoPin, INPUT); //set pin to input

// setup  display parameters
byte numDigits = 4; // number of digits on the display
byte digitPins[] = {13,12,11,10}; //array for the pins at the arduino for the digits D1- D4
byte segmentPins[] = {2,3,4,5,6,7,8}; // array for the pins at the arduino for each the  lettered displaya pins a -g

 boolean resistorsOnSegments = true; // true if resistors are being used
boolean updateWithDelaysIn = true; // delays used
byte hardwareConfig = COMMON_ANODE; // display type (Common Anode or Common Cathode, check datasheet of display)

sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
sevseg.setBrightness(99);

}

void loop() {

digitalWrite(trigPin, LOW); // send short signal on the trigpin
delayMicroseconds(5);
digitalWrite(trigPin, HIGH); // send signal for 10ms
delayMicroseconds(10);
digitalWrite(trigPin, LOW); // turn off signal after 10ms
interval = pulseIn(echoPin, HIGH); // read signal from trigpin

// determine distance by using the time from the trig and echo pins // divide interval by 2 then divide again by 29 cm = (interval/2) / 29;
// print to serial monitor
Serial.print(cm);
Serial.print("cm");
Serial.println();

//print to 7 segment display sevseg.setNumber(cm); // print the value of cm to the display sevseg.refreshDisplay();
}