Need help with codes (continuity cable tester with lcd 16x2 i2C)

Projects Programming
17

I played around with the code, I finally got it working with button press analog pin A0 (A1,A2.e.g)
My working code with button press, pretty straight forward. However, I'd like to set it automatic scan instead of press the button, is there a way to change?

#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
const uint8_t i2cAddr = 0x27;
const int rs=0, rw=1, en=2, db4=4, db5=5, db6=6, db7=7, bl=3;
typeof(POSITIVE) blpol=POSITIVE; // backlight polarity level
LiquidCrystal_I2C lcd(i2cAddr, en, rw, rs, db4, db5, db6, db7, bl, blpol);

//pins

#define sizeTest 4

int endA[sizeTest] = {4, 5, 6, 7}; //pins end A
int endB[sizeTest] = {8, 9, 10, 11}; //pins endB
int pSwitch = A0;
int pEncA = A1;
int pEncB = A2;


//results
int result[sizeTest];
int test[sizeTest];
int counter[sizeTest];
bool fail;

void setup() {

  Serial.begin(115200); //serial used for debugging only
  lcd.begin(16, 2);

  //setup pins
  for (int i = 0; i < sizeTest; i++) {
    pinMode(endA[i], OUTPUT);//set output pins (end A)
    pinMode(endB[i], INPUT_PULLUP);//set input pins (end B)
  }
  pinMode(pSwitch, INPUT_PULLUP);
  lcd.clear();
  lcd.print("Cable Tester");
  lcd.setCursor(0, 1);
  lcd.print("Press to Start");
}

void loop() {
  //run the test
  if (!digitalRead(pSwitch)) {
    runTest_4x1();
    delay(200);
  }
}

void runTest_4x1() {

  // add space for null terminator
  char s[sizeTest+1] = "0000";

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Testing 4 Pin");
  lcd.setCursor(0, 1);

  // re-initialize reqired variables
  fail = false;
  for (int i = 0; i < sizeTest; i++){
    result[i] = -1;
    test[i] = -1;
    counter[i] = -1;
  }

  for (int i = 0; i < sizeTest; i++) {
    counter[i] = 0;
    for (int j = 0; j < 4; j++) {
      digitalWrite(endA[i], LOW); //set all outputs to LOW
    }
    for (int j = 0; j < sizeTest; j++) { //check for crossed / open circuits vs closed, good, circuits
      digitalWrite(endA[j], HIGH); //scan across the inputs in turn
      test[i] = digitalRead(endB[i]); //read the output
      if (test[i] == 1 && j != i) { //crossed or open circuit
        counter[i]++;
        result[i] = 8 + j;
      }
      else if (test[i] == 1 && j == i && result[i] < 8 ) { //Good, closed circuit
        result[i] = 0;
      }
      digitalWrite(endA[j], LOW);
      //debugging
      /*
        Serial.print("test input core  ");
        Serial.print(i);
        Serial.print(" with output core  ");
        Serial.print(j);
        Serial.print(" test =");
        Serial.print(test[i]);
        Serial.print(" counter =");
        Serial.println(counter[i]);
      */
    }
    Serial.print("Core ");
    Serial.print(i);
    Serial.print(" result = ");
    if (result[i] == 0) {
      Serial.println(" 1");
      s[i] = '1';
    }
    else if (counter[i] == 3) {
      Serial.println(" O");
      s[i] = '0';
      fail = true;
    }
    else {
      Serial.println(" X");
      s[i] = 'X';
      fail = true;
    }
  }
  lcd.print(s);
  lcd.setCursor(0, 2);

  if (fail) {
    Serial.println("DEFECT");
    lcd.print("DEFECT");
  }
  else {
    Serial.println("CABLE OK");
    lcd.print("CABLE OK");
  }
  Serial.println();
  lcd.setCursor(0, 3);
  lcd.print("Press to Start");
}