/*
Pinbelegung ESP32-DevKitC Pin Layout auf Seite 6 von:
https://asset.conrad.com/media10/add/160267/c1/-/gl/002490159DS00/adatlap-2490159-espressif-fejlesztoi-panel-esp32-devkitc-vie.pdf

Dieses Programm ist zum testen der Grundlagen und darf von jeden für seine Zwecke verwendet werden.
Dieses Programm enthält Codefragmente von:

https://www.youtube.com/watch?v=90qKWsqUikg
https://github.com/Edistechlab/DIY-Heimautomation-Buch/blob/master/Aktoren/7_Segment_Display_No_library/7_Segment_Display_No_library.ino
https://www.youtube.com/@EdisTechlab

Google translation:
Pin assignment ESP32-DevKitC Pin Layout on page 6 of:
https://asset.conrad.com/media10/add/160267/c1/-/gl/002490159DS00/adatlap-2490159-espressif-fejlesztoi-panel-esp32-devkitc-vie.pdf

This program is for testing the basics and can be used by anyone for their own purposes.
This program contains code fragments from:

https://www.youtube.com/watch?v=90qKWsqUikg
https://github.com/Edistechlab/DIY-Heimautomation-Buch/blob/master/Aktoren/7_Segment_Display_No_library/7_Segment_Display_No_library.ino
https://www.youtube.com/@EdisTechlab

*/

//  der benutzen Anschl�sse or definitions of the used pins
#define Pin_Seg_A    21
#define Pin_Seg_B    23
#define Pin_Seg_C    17
#define Pin_Seg_D    18
#define Pin_Seg_E    19
#define Pin_Seg_F    22
#define Pin_Seg_G    16
#define Pin_Seg_DP   5

#define Pin_Display_Sel0     4
#define Pin_Display_Sel1     0
#define Pin_Display_Enable   2

#define Pin_Start_LED  12
#define Pin_Stop_LED   13
#define Pin_Reset_LED  14

#define Pin_Start_Button   25
#define Pin_Stop_Button    26
#define Pin_Reset_Button   27


int pinArray1[] = {Pin_Seg_A, Pin_Seg_B, Pin_Seg_C, Pin_Seg_D, Pin_Seg_E, Pin_Seg_F, Pin_Seg_G, Pin_Seg_DP};
int pinArray2[] = {Pin_Display_Sel0, Pin_Display_Sel1 };
int VarDig0; int VarDig1; int VarDig2; int VarDig3; int VarX;
int varButtonStart =1;
int varButtonStop =1;
int varButtonReset =1;
int VarZaehlen =0; // or VarCount

int numArray[11][8] = {  
  { 1,1,1,1,1,1,0,0 },{ 0,1,1,0,0,0,0,0 },{ 1,1,0,1,1,0,1,0 },  // 0-2
  { 1,1,1,1,0,0,1,0 },{ 0,1,1,0,0,1,1,0 },{ 1,0,1,1,0,1,1,0 },  // 3-5
  { 1,0,1,1,1,1,1,0 },{ 1,1,1,0,0,0,0,0 },{ 1,1,1,1,1,1,1,0 },  // 6-8
  { 1,1,1,0,0,1,1,0 },{ 0,0,0,0,0,0,0,1 }                       // 9+Punkt or 9+dot
}; 

int DigitArray[4][2] = {{ 1,1 },{ 1,0 },{ 0,1 },{ 0,0 },}; 

void Display7Segment(int EnableTime) {
  for (int forwiederholung = 0; forwiederholung < 10; forwiederholung++) { // or forrepeat
    for (int fordigit=0;fordigit<4;fordigit++) {
      switch (fordigit) {
        case 0:VarX = VarDig0;break;
        case 1:VarX = VarDig1;break;
        case 2:VarX = VarDig2;break;
        case 3:VarX = VarDig3;//break;
      }
      for (int forsegment = 0; forsegment < 8; forsegment++) {
        digitalWrite(pinArray1[forsegment], 1 - numArray[VarX][forsegment]);
      }
      for (int forselect = 0; forselect < 2; forselect++) {
        digitalWrite(pinArray2[forselect], DigitArray[fordigit][forselect]);
      }
      digitalWrite(Pin_Display_Enable, 0);delay(EnableTime);digitalWrite(Pin_Display_Enable, 1);
    }
    varButtonStart = digitalRead(Pin_Start_Button);
    digitalWrite(Pin_Start_LED, varButtonStart);
    if ( varButtonStart == LOW ) { VarZaehlen = 1; }
    varButtonStop = digitalRead(Pin_Stop_Button);
    digitalWrite(Pin_Stop_LED, varButtonStop);
    if ( varButtonStop == LOW ) { VarZaehlen = 0;}
    varButtonReset = digitalRead(Pin_Reset_Button) + VarZaehlen;
    digitalWrite(Pin_Reset_LED, varButtonReset);
    if ( varButtonReset == LOW ) { VarDig0 = 0; VarDig1 = 0; VarDig2 = 0; VarDig3 = 0;
    }
  }
}

void setup() {
  // put your setup code here, to run once:

  pinMode(Pin_Display_Enable, OUTPUT);digitalWrite(Pin_Display_Enable, 1);
  pinMode(Pin_Display_Sel0, OUTPUT);digitalWrite(Pin_Display_Sel0, 0);
  pinMode(Pin_Display_Sel1, OUTPUT);digitalWrite(Pin_Display_Sel1, 0);
  pinMode(Pin_Start_Button, INPUT_PULLUP);
  pinMode(Pin_Stop_Button, INPUT_PULLUP);
  pinMode(Pin_Reset_Button, INPUT_PULLUP);
  pinMode(Pin_Start_LED, OUTPUT);digitalWrite(Pin_Start_LED, 1);
  pinMode(Pin_Stop_LED, OUTPUT);digitalWrite(Pin_Stop_LED, 1);
  pinMode(Pin_Reset_LED, OUTPUT);digitalWrite(Pin_Reset_LED, 1);
  VarZaehlen = 0;

  for (int i = 0; i < 8; i++) {
    pinMode(pinArray1[i], OUTPUT);digitalWrite(pinArray1[i], 0);
  }

  Serial.begin(115200);
  delay(1000);
  Serial.println("Hello, ESP32!\nIch zähle von 0 bis 9999");
}

void loop() {
  // put your main code here, to run repeatedly:

  // Zähler 0 - 9999 or Counter 0 - 9999
  VarDig0 = VarDig0 + VarZaehlen;
  
  if ( VarDig0 > 9 ) { VarDig0 = 0; VarDig1 +=1;
    if ( VarDig1 > 9 ) { VarDig1 = 0; VarDig2 +=1;
      if ( VarDig2 > 9 ) { VarDig2 = 0; VarDig3 +=1;
        if ( VarDig3 > 9 ) { VarDig3 = 0; 
  }}}}

   Display7Segment (25);
  
}