Sevenmojoe
Published © CC BY-NC-SA

Snacks Vending Machine Powered By Arduino

Create a Vending Machine, powered by Arduino microcontroller, using "any cheap and easy to get" components available in local store.

IntermediateFull instructions provided27,758
Snacks Vending Machine Powered By Arduino

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
I should use Arduino Mega instead, for more IO.
×1
Sensor Shield
×1
DC Motor 6V include Wheel
×3
Infrared (reflective) or line follower sensor, used for product detection
×3
Proximity (electromagnetic) sensor, used for coin sensor number 1
×1
Distance interupter (infrared/optocoupler) sensor, used for coin sensor number 2
×1
Power Supply 6V for DC motor
×1
Relay (generic)
4 Switch Relay
×1
LCD (Nokia 5110 LCD)
×1
LED (generic)
LED (generic)
White LED
×2
Push Button
Red, Yelow, and Green
×3

Software apps and online services

Arduino IDE
Arduino IDE
Solidworks
or any 3d model maker

Story

Read more

Custom parts and enclosures

Printscreen of Solidworks model for this Snacks Vending Machine

This is printscreen of my solidworks 3d model for this project.

Code

Source code for Snacks Vending Machine

Arduino
This is source code i used for this vending machine project
const byte SIAP = 0;
const byte KOIN_MASUK1 = 1;
const byte KOIN_MASUK2 = 2;
const byte KOIN_MASUK3 = 3;
const byte KOIN_MASUK4 = 4;
const byte KOIN_MASUK5 = 5;
const byte KOIN_MASUK6 = 6;
const byte KOIN_MASUK7 = 7;
const byte SALDO_500 = 8;
const byte SALDO_500500 = 9;
const byte SALDO_500500500 = 10;
const byte SALDO_500500500500 = 11;
const byte SALDO_5005005001000 = 12;
const byte SALDO_5001000 = 13;
const byte SALDO_5001000500 = 14;
const byte SALDO_50010001000 = 15;
const byte SALDO_5005001000 = 16;
const byte SALDO_1000 = 17;
const byte SALDO_10001000 = 18;
const byte SALDO_1000500 = 19;
const byte SALDO_1000500500 = 20;
const byte SALDO_10005001000 = 21;
const byte KOIN_KELUAR = 22;
byte state = SIAP;
const float jeda_waktu = 876;
unsigned long time1;
unsigned long time2;
unsigned long time3;
unsigned long time4;
unsigned long time5;
unsigned long time6;
unsigned long time7;

#define PIN_SCE   7
#define PIN_RESET 6
#define PIN_DC    5
#define PIN_SDIN  4
#define PIN_SCLK  3
#define LCD_C     LOW
#define LCD_D     HIGH
#define LCD_X     84
#define LCD_Y     48

static const byte ASCII[][5] =
{
  {0x00, 0x00, 0x00, 0x00, 0x00} // 20
  , {0x00, 0x00, 0x5f, 0x00, 0x00} // 21 !
  , {0x00, 0x07, 0x00, 0x07, 0x00} // 22 "
  , {0x14, 0x7f, 0x14, 0x7f, 0x14} // 23 #
  , {0x24, 0x2a, 0x7f, 0x2a, 0x12} // 24 $
  , {0x23, 0x13, 0x08, 0x64, 0x62} // 25 %
  , {0x36, 0x49, 0x55, 0x22, 0x50} // 26 &
  , {0x00, 0x05, 0x03, 0x00, 0x00} // 27 '
  , {0x00, 0x1c, 0x22, 0x41, 0x00} // 28 (
  , {0x00, 0x41, 0x22, 0x1c, 0x00} // 29 )
  , {0x14, 0x08, 0x3e, 0x08, 0x14} // 2a *
  , {0x08, 0x08, 0x3e, 0x08, 0x08} // 2b +
  , {0x00, 0x50, 0x30, 0x00, 0x00} // 2c ,
  , {0x08, 0x08, 0x08, 0x08, 0x08} // 2d -
  , {0x00, 0x60, 0x60, 0x00, 0x00} // 2e .
  , {0x20, 0x10, 0x08, 0x04, 0x02} // 2f /
  , {0x3e, 0x51, 0x49, 0x45, 0x3e} // 30 0
  , {0x00, 0x42, 0x7f, 0x40, 0x00} // 31 1
  , {0x42, 0x61, 0x51, 0x49, 0x46} // 32 2
  , {0x21, 0x41, 0x45, 0x4b, 0x31} // 33 3
  , {0x18, 0x14, 0x12, 0x7f, 0x10} // 34 4
  , {0x27, 0x45, 0x45, 0x45, 0x39} // 35 5
  , {0x3c, 0x4a, 0x49, 0x49, 0x30} // 36 6
  , {0x01, 0x71, 0x09, 0x05, 0x03} // 37 7
  , {0x36, 0x49, 0x49, 0x49, 0x36} // 38 8
  , {0x06, 0x49, 0x49, 0x29, 0x1e} // 39 9
  , {0x00, 0x36, 0x36, 0x00, 0x00} // 3a :
  , {0x00, 0x56, 0x36, 0x00, 0x00} // 3b ;
  , {0x08, 0x14, 0x22, 0x41, 0x00} // 3c <
  , {0x14, 0x14, 0x14, 0x14, 0x14} // 3d =
  , {0x00, 0x41, 0x22, 0x14, 0x08} // 3e >
  , {0x02, 0x01, 0x51, 0x09, 0x06} // 3f ?
  , {0x32, 0x49, 0x79, 0x41, 0x3e} // 40 @
  , {0x7e, 0x11, 0x11, 0x11, 0x7e} // 41 A
  , {0x7f, 0x49, 0x49, 0x49, 0x36} // 42 B
  , {0x3e, 0x41, 0x41, 0x41, 0x22} // 43 C
  , {0x7f, 0x41, 0x41, 0x22, 0x1c} // 44 D
  , {0x7f, 0x49, 0x49, 0x49, 0x41} // 45 E
  , {0x7f, 0x09, 0x09, 0x09, 0x01} // 46 F
  , {0x3e, 0x41, 0x49, 0x49, 0x7a} // 47 G
  , {0x7f, 0x08, 0x08, 0x08, 0x7f} // 48 H
  , {0x00, 0x41, 0x7f, 0x41, 0x00} // 49 I
  , {0x20, 0x40, 0x41, 0x3f, 0x01} // 4a J
  , {0x7f, 0x08, 0x14, 0x22, 0x41} // 4b K
  , {0x7f, 0x40, 0x40, 0x40, 0x40} // 4c L
  , {0x7f, 0x02, 0x0c, 0x02, 0x7f} // 4d M
  , {0x7f, 0x04, 0x08, 0x10, 0x7f} // 4e N
  , {0x3e, 0x41, 0x41, 0x41, 0x3e} // 4f O
  , {0x7f, 0x09, 0x09, 0x09, 0x06} // 50 P
  , {0x3e, 0x41, 0x51, 0x21, 0x5e} // 51 Q
  , {0x7f, 0x09, 0x19, 0x29, 0x46} // 52 R
  , {0x46, 0x49, 0x49, 0x49, 0x31} // 53 S
  , {0x01, 0x01, 0x7f, 0x01, 0x01} // 54 T
  , {0x3f, 0x40, 0x40, 0x40, 0x3f} // 55 U
  , {0x1f, 0x20, 0x40, 0x20, 0x1f} // 56 V
  , {0x3f, 0x40, 0x38, 0x40, 0x3f} // 57 W
  , {0x63, 0x14, 0x08, 0x14, 0x63} // 58 X
  , {0x07, 0x08, 0x70, 0x08, 0x07} // 59 Y
  , {0x61, 0x51, 0x49, 0x45, 0x43} // 5a Z
  , {0x00, 0x7f, 0x41, 0x41, 0x00} // 5b [
  , {0x02, 0x04, 0x08, 0x10, 0x20} // 5c ¥
  , {0x00, 0x41, 0x41, 0x7f, 0x00} // 5d ]
  , {0x04, 0x02, 0x01, 0x02, 0x04} // 5e ^
  , {0x40, 0x40, 0x40, 0x40, 0x40} // 5f _
  , {0x00, 0x01, 0x02, 0x04, 0x00} // 60 `
  , {0x20, 0x54, 0x54, 0x54, 0x78} // 61 a
  , {0x7f, 0x48, 0x44, 0x44, 0x38} // 62 b
  , {0x38, 0x44, 0x44, 0x44, 0x20} // 63 c
  , {0x38, 0x44, 0x44, 0x48, 0x7f} // 64 d
  , {0x38, 0x54, 0x54, 0x54, 0x18} // 65 e
  , {0x08, 0x7e, 0x09, 0x01, 0x02} // 66 f
  , {0x0c, 0x52, 0x52, 0x52, 0x3e} // 67 g
  , {0x7f, 0x08, 0x04, 0x04, 0x78} // 68 h
  , {0x00, 0x44, 0x7d, 0x40, 0x00} // 69 i
  , {0x20, 0x40, 0x44, 0x3d, 0x00} // 6a j
  , {0x7f, 0x10, 0x28, 0x44, 0x00} // 6b k
  , {0x00, 0x41, 0x7f, 0x40, 0x00} // 6c l
  , {0x7c, 0x04, 0x18, 0x04, 0x78} // 6d m
  , {0x7c, 0x08, 0x04, 0x04, 0x78} // 6e n
  , {0x38, 0x44, 0x44, 0x44, 0x38} // 6f o
  , {0x7c, 0x14, 0x14, 0x14, 0x08} // 70 p
  , {0x08, 0x14, 0x14, 0x18, 0x7c} // 71 q
  , {0x7c, 0x08, 0x04, 0x04, 0x08} // 72 r
  , {0x48, 0x54, 0x54, 0x54, 0x20} // 73 s
  , {0x04, 0x3f, 0x44, 0x40, 0x20} // 74 t
  , {0x3c, 0x40, 0x40, 0x20, 0x7c} // 75 u
  , {0x1c, 0x20, 0x40, 0x20, 0x1c} // 76 v
  , {0x3c, 0x40, 0x30, 0x40, 0x3c} // 77 w
  , {0x44, 0x28, 0x10, 0x28, 0x44} // 78 x
  , {0x0c, 0x50, 0x50, 0x50, 0x3c} // 79 y
  , {0x44, 0x64, 0x54, 0x4c, 0x44} // 7a z
  , {0x00, 0x08, 0x36, 0x41, 0x00} // 7b {
  , {0x00, 0x00, 0x7f, 0x00, 0x00} // 7c |
  , {0x00, 0x41, 0x36, 0x08, 0x00} // 7d }
  , {0x10, 0x08, 0x08, 0x10, 0x08} // 7e �
  , {0x78, 0x46, 0x41, 0x46, 0x78} // 7f →
};

void LcdWrite(byte dc, byte data)
{
  digitalWrite(PIN_DC, dc);
  digitalWrite(PIN_SCE, LOW);
  shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, data);
  digitalWrite(PIN_SCE, HIGH);
}

void LcdCharacter(char character)
{
  LcdWrite(LCD_D, 0x00);
  for (int index = 0; index < 5; index++)
  {
    LcdWrite(LCD_D, ASCII[character - 0x20][index]);
  }
  LcdWrite(LCD_D, 0x00);
}

void LcdClear(void)
{
  for (int index = 0; index < LCD_X * LCD_Y / 8; index++)
  {
    LcdWrite(LCD_D, 0x00);
  }
}

void LcdInitialise(void)
{
  pinMode(PIN_SCE, OUTPUT);
  pinMode(PIN_RESET, OUTPUT);
  pinMode(PIN_DC, OUTPUT);
  pinMode(PIN_SDIN, OUTPUT);
  pinMode(PIN_SCLK, OUTPUT);
  digitalWrite(PIN_RESET, LOW);
  digitalWrite(PIN_RESET, HIGH);
  LcdWrite(LCD_C, 0x21 );
  LcdWrite(LCD_C, 0xB1 );
  LcdWrite(LCD_C, 0x04 );
  LcdWrite(LCD_C, 0x14 );
  LcdWrite(LCD_C, 0x20 );
  LcdWrite(LCD_C, 0x0C );
}

void LcdString(char *characters)
{
  while (*characters)
  {
    LcdCharacter(*characters++);
  }
}

void setup() {
  //enable output on the digital pins
  pinMode( 11, INPUT);
  pinMode( 12, INPUT);
  pinMode( 14, INPUT);
  pinMode( 15, INPUT);
  pinMode( 16, INPUT);
  pinMode( 17, INPUT);
  pinMode( 18, INPUT);
  pinMode( 19, INPUT);
  pinMode( 13 , OUTPUT);
  pinMode( 8 , OUTPUT);
  pinMode( 9 , OUTPUT);
  pinMode( 10 , OUTPUT);
  pinMode( 2 , OUTPUT);
  digitalWrite(8, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(13, LOW);
  Serial.begin(9600);
  Serial.println("=> Siap");
  LcdInitialise();
  LcdClear();
  LcdString("                   Masukkan   Koin Rp500     atau     Koin Rp1000  @ Rp2000");
  delay(500);
}

void loop() {
  int x = analogRead(14);
  if (state == SIAP) {
    if (x >= 33) {
      state = KOIN_MASUK1;
      time1 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
   else if ((state == KOIN_MASUK1) && (!(digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK1)) {
      unsigned long diff1 = (millis() - time1);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff1);
      Serial.println(" ms");
      if (diff1 > jeda_waktu) {
        state = SALDO_1000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp1000            Tambah  Koin Koin Rp1000");
        digitalWrite (13, HIGH);     
        Serial.println("koin=Rp 1000, Saldo: Rp1000");
        tone(2, 4200, 299);
      }
      else if (diff1 < jeda_waktu) {
        state = SALDO_500;        
        digitalWrite (13, HIGH);
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo= Rp500            Tambah  Koin Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp500");
        tone(2, 4200, 299);
      }
    }
  }
  
  if (state == SALDO_500) {
    if (x >= 33) {
      state = KOIN_MASUK2;
      time2 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK2) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK2)) {
      unsigned long diff2 = (millis() - time2);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff2);
      Serial.println(" ms");
      if (diff2 > jeda_waktu) {
        state = SALDO_5001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp1500            Tambah  Koin Koin Rp1000");
        tone(2, 4200, 299);
        Serial.println("koin=Rp 1000, Saldo: Rp1500");
      }
      else if (diff2 < jeda_waktu) {
        state = SALDO_500500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp1000            Tambah  Koin Koin Rp500");
        tone(2, 4200, 299);
        Serial.println("koin=Rp 500, Saldo: Rp1000");            
      }
    }
  }

  if (state == SALDO_500500) {
    if (x >= 33) {
      state = KOIN_MASUK3;
      time3 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK3) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK3)) {
      unsigned long diff3 = (millis() - time3);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff3);
      Serial.println(" ms");
      if (diff3 > jeda_waktu) {
        state = SALDO_5005001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2000            Pilih Produk Koin Rp1000");
        Serial.println("koin=Rp 1000, Saldo: Rp2000");
        tone(2, 4200, 799);
      }
      else if (diff3 < jeda_waktu) {
        state = SALDO_500500500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp1500            Tambah  Koin Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp1500");
        tone(2, 4200, 299);
      }
    }
  }

  if (state == SALDO_500500500) {
    if (x >= 33) {
      state = KOIN_MASUK4;
      time4 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK4) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK4)) {
      unsigned long diff4 = (millis() - time4);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff4);
      Serial.println(" ms");
      if (diff4 > jeda_waktu) {
        state = SALDO_5005005001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2500            Pilih Produk Koin Rp1000");
        Serial.println("koin=Rp 1000, Saldo: Rp2500");
        tone(2, 4200, 799);       
      }
      else if (diff4 < jeda_waktu) {
        state = SALDO_500500500500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2000            Pilih Produk Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp2000");
        tone(2, 4200, 799);
      }
    }
  }

if (state == SALDO_5001000) {
    if (x >= 33) {
      state = KOIN_MASUK5;
      time5 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK5) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK5)) {
      unsigned long diff5 = (millis() - time5);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff5);
      Serial.println(" ms");
      if (diff5 > jeda_waktu) {
        state = SALDO_50010001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2500            Pilih Produk Koin Rp1000");
        Serial.println("koin=Rp 1000, Saldo: Rp2500");
        tone(2, 4200, 799);       
      }
      else if (diff5 < jeda_waktu) {
        state = SALDO_5001000500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2000            Pilih Produk Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp2000");
        tone(2, 4200, 799);
      }
    }
  }

  if (state == SALDO_1000) {
    if (x >= 33) {
      state = KOIN_MASUK6;
      time6 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK6) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK6)) {
      unsigned long diff6 = (millis() - time6);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff6);
      Serial.println(" ms");
      if (diff6 > jeda_waktu) {
        state = SALDO_10001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2000            Pilih Produk Koin Rp1000");
        Serial.println("koin=Rp 1000, Saldo: Rp2000");
        tone(2, 4200, 799);       
      }
      else if (diff6 < jeda_waktu) {
        state = SALDO_1000500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp1500            Tambah  Koin Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp1500");
        tone(2, 4200, 299);
      }
    }
  }

  if (state == SALDO_1000500) {
    if (x >= 33) {
      state = KOIN_MASUK7;
      time7 = millis();
      tone(2, 4200, 40);
      Serial.println("snsr1,");
      Serial.println("start wkt");
    }
  }
  else if ((state == KOIN_MASUK7) && ((digitalRead(13)))) {
    if ((digitalRead(12)) && (state == KOIN_MASUK7)) {
      unsigned long diff7 = (millis() - time7);
      Serial.println("snsr2,");
      Serial.println("stop wkt");
      Serial.print("jeda wkt: ");
      Serial.print(diff7);
      Serial.println(" ms");
      if (diff7 > jeda_waktu) {
        state = SALDO_10005001000;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2500            Pilih Produk Koin Rp1000");
        Serial.println("koin=Rp 1000, Saldo: Rp2500");
        tone(2, 4200, 799);       
      }
      else if (diff7 < jeda_waktu) {
        state = SALDO_1000500500;
        LcdInitialise();
        LcdClear();
        LcdString("       diterima              Saldo=Rp2000            Pilih Produk Koin Rp500");
        Serial.println("koin=Rp 500, Saldo: Rp2000");
        tone(2, 4200, 799);
      }
    }
  }
  
  else if ((state == SALDO_500500500500)||(state == SALDO_5005005001000)||(state == SALDO_5001000500)||(state == SALDO_50010001000)||(state == SALDO_5005001000)||(state == SALDO_10001000)||(state == SALDO_1000500500)||(state == SALDO_10005001000)) {
    if (((( digitalRead(13) && ( ( digitalRead(9) ) && ( digitalRead(10) ) ) ) && digitalRead(17) )) && ((digitalRead(8)))) {
      LcdInitialise();
      LcdClear();
      LcdString("        Mohon      Menunggu");
      Serial.println("pb1");
      tone(2, 4200, 200);
      delay( 2500 );
      digitalWrite( 8 , LOW );
      Serial.println("motor1");
    }
    else {
      if ( (!(digitalRead(8)) && (!(digitalRead(11)) ))) {
        digitalWrite( 8 , HIGH );
        LcdInitialise();
        LcdClear();
        LcdString("     Terima Kasih");
        tone(2, 4200, 100);
        delay( 150 );
        tone(2, 4200, 100);
        Serial.println("produk1 jatuh");
        delay( 4000 );
        digitalWrite( 13 , LOW );
        state = KOIN_KELUAR;
      }
      else {
      }
    }
    if (((( ( digitalRead(13) && ( ( digitalRead(8) ) && ( digitalRead(10) ) ) ) && digitalRead(18) )) && ((digitalRead(9))))) {
      LcdInitialise();
      LcdClear();
      LcdString("        Mohon      Menunggu");
      Serial.println("pb2");
      tone(2, 4200, 200);
      delay( 2500 );
      digitalWrite( 9 , LOW );
      Serial.println("motor2");
    }
    else {
      if ( (!(digitalRead(9)) && (!(digitalRead(15)) ))) {
        digitalWrite( 9 , HIGH );
        LcdInitialise();
        LcdClear();
        LcdString("     Terima Kasih");
        tone(2, 4200, 100);
        delay( 150 );
        tone(2, 4200, 100);
        Serial.println("produk2 jatuh");
        delay( 4000 );
        digitalWrite( 13 , LOW );
        state = KOIN_KELUAR;
      }
      else {
      }
    }
    if (((( ( digitalRead(13) && ( ( digitalRead(8) ) && ( digitalRead(9) ) ) ) && digitalRead(19) )) && ((digitalRead(10))))) {
      LcdInitialise();
      LcdClear();
      LcdString("        Mohon      Menunggu");
      Serial.println("pb3");
      tone(2, 4200, 200);
      delay( 2500 );
      digitalWrite( 10 , LOW );
      Serial.println("motor3");
    }
    else {
      if ( (!(digitalRead(10)) && (!(digitalRead(16)) ))) {
        digitalWrite( 10 , HIGH );
        LcdInitialise();
        LcdClear();
        LcdString("     Terima Kasih");
        tone(2, 4200, 100);
        delay( 150 );
        tone(2, 4200, 100);
        Serial.println("produk3 jatuh");
        delay( 4000 );
        digitalWrite( 13 , LOW );
        state = KOIN_KELUAR;
      }
      else {
      }
    }
  }
  else if ((state == KOIN_KELUAR)) {
    if (((x <= 33) && !digitalRead(12)) && (!digitalRead(13))) {
      state = SIAP;
      LcdInitialise();
      LcdClear();
      LcdString("                   Masukkan   Koin Rp500     atau     Koin Rp1000  @ Rp2000");
      Serial.println("=> Siap");
    }
  }
}

Credits

Sevenmojoe

Sevenmojoe

1 project • 24 followers
Mechanical Engineering, majoring Mechatronic, finished thesis about Snack Vending Machine's Build and Manufacturing

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