Seven segment neopixel display with scale

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Here is the latest version:

#include "HX711.h"
#include <Adafruit_NeoPixel.h>

HX711 scale;

const int buttonPin = 5;     // the number of the pushbutton pin
int buttonState = 0;         // variable for reading the pushbutton status

#define PIXELS_PER_SEGMENT  4     // Number of LEDs in each Segment
#define PIXELS_DIGITS       3     // Number of connected Digits 
#define PIXELS_PIN          2     // GPIO Pin
//  scale pins
uint8_t dataPin = 4;
uint8_t clockPin = 5;

//scale
float w1, w2, previous = 0;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXELS_PER_SEGMENT * 7 * PIXELS_DIGITS, PIXELS_PIN, NEO_GRB + NEO_KHZ800);

//Pixel Arrangement
/*
          a
        f   b
          g
        e   c
          d
*/

// Segment array
byte segments[7] = {
  //abcdefg
  0b0000001,     // Segment g
  0b0000100,     // Segment e
  0b0001000,     // Segment d
  0b0010000,     // Segment c
  0b0100000,     // Segment b
  0b1000000,     // Segment a
  0b0000010     // Segment f
};

//Digits array
byte digits[10] = {
  //abcdefg
  0b1111110,     // 0
  0b0110000,     // 1
  0b1101101,     // 2
  0b1111001,     // 3
  0b0110011,     // 4
  0b1011011,     // 5
  0b1011111,     // 6
  0b1110000,     // 7
  0b1111111,     // 8
  0b1110011      // 9
};

//Clear all the Pixels (possibly use with tare to reset leds)
void clearDisplay() {
  for (int i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, strip.Color(0, 0, 0));
  }
  strip.show();
}

void setup() {

  // initialize the LED display pin as an output:
  pinMode(PIXELS_PIN, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
  
  strip.begin();

  Serial.begin(115200);
  Serial.println(__FILE__);
  Serial.print("HX711_LIB_VERSION: ");
  Serial.println(HX711_LIB_VERSION);
  Serial.println();

  scale.begin(dataPin, clockPin);

  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));

  //  load cell factor 20 KG
  //  scale.set_scale(127.15);
  //  load cell factor 5 KG
  scale.set_scale(420.0983);       //calibrate scale
  scale.tare();

  Serial.print("UNITS: ");
  Serial.println(scale.get_units(10));
}

void loop() {

  // Tare button
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // tare display to 000:
    //void clearDisplay()
    //scale.tare();
  } else {
    // do nothing
  }
  
  // scale
  
  //  read until stable
  w1 = scale.get_units(10);
  delay(100);
  w2 = scale.get_units();
  while (abs(w1 - w2) > 10)
  {
     w1 = w2;
     w2 = scale.get_units();
     delay(100);
  }

  Serial.print("UNITS: ");
  Serial.print(w1);
  if (w1 == 0)
  {
    Serial.println();
  }
  else
  {
    Serial.print("\t\tDELTA: ");
    Serial.println(w1 - previous);
    previous = w1;
  }
  delay(100);


  //Neopixel strip (change for display)
  
  disp_Digits(1000);            // Show digits from 0-9              (DelayTime)
 //disp_CountUP(500, 450);       // Count numbers in Ascending order  (NUMBER, DelayTime)
 //disp_CountDOWN(500, 250);     // Count numbers in Descending order (NUMBER, DelayTime)
}

void disp_Digits(int wait) {
  clearDisplay();
  for (int i = 0; i < 10; i++) {
    for (int n = 0; n < PIXELS_DIGITS; n++) {
      writeDigit(n, i);
    }
    strip.show();
    delay(wait);
  }
}

void disp_CountUP(int num, int wait) {
  clearDisplay();
  for (int i = 0; i <= num; i++) {
    writeDigit(0, (i / 100) % 10);
    writeDigit(1, (i / 10) % 10);
    writeDigit(2, (i / 1) % 10);
    strip.show();
    delay(wait);
  }
}

void disp_CountDOWN(int num, int wait) {
  clearDisplay();
  for (int i = num; i >= 0; i--) {
    writeDigit(0, (i / 100) % 10);
    writeDigit(1, (i / 10) % 10);
    writeDigit(2, (i / 1) % 10);
    strip.show();
    delay(wait);
  }
}


void writeDigit(int index, int val) {
  byte digit = digits[val];
  for (int i = 6; i >= 0; i--) {
    int offset = index * (PIXELS_PER_SEGMENT * 7) + i * PIXELS_PER_SEGMENT;
    uint32_t color;
    if (digit & 0x01 != 0) {
      if (val == 1) color = strip.Color(255, 0,  0);
      if (val == 2) color = strip.Color(255, 0, 0);
      if (val == 3) color = strip.Color(255, 0, 0);
      if (val == 4) color = strip.Color(255, 0,  0);
      if (val == 5) color = strip.Color(255, 0, 0);
      if (val == 6) color = strip.Color(255,  0, 0);
      if (val == 7) color = strip.Color(255, 0, 0);
      if (val == 8) color = strip.Color(255, 0, 0);
      if (val == 9) color = strip.Color(255, 0, 0);
      if (val == 0) color = strip.Color(255, 0, 0);
    }
    else
      color = strip.Color(0, 0, 0);

    for (int j = offset; j < offset + PIXELS_PER_SEGMENT; j++) {
      strip.setPixelColor(j, color);
    }
    digit = digit >> 1;
  }
}

void writeSegment(int index, int val) {
  byte seg = segments[val];
  for (int i = 6; i >= 0; i--) {
    int offset = index * (PIXELS_PER_SEGMENT * 7) + i * PIXELS_PER_SEGMENT;
    uint32_t color;
    if (seg & 0x01 != 0) {
      if (val == 0) color = strip.Color(50, 0, 0);
      if (val == 1) color = strip.Color(0, 50, 50);
      if (val == 2) color = strip.Color(0, 50, 0);
      if (val == 3) color = strip.Color(50, 0, 50);
      if (val == 4) color = strip.Color(50, 50, 50);
      if (val == 5) color = strip.Color(0, 0, 50);
      if (val == 6) color = strip.Color(50, 50, 0);
    }
    else
      color = strip.Color(0, 0, 0);

    for (int j = offset; j < offset + PIXELS_PER_SEGMENT; j++) {
      strip.setPixelColor(j, color);
    }
    seg = seg >> 1;
  }
}