newbie need help

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1

i need help about arduino code for combine LCD,COIN ACCEPTOR, CONTINUOUS ROTATION SERVO & KEYPAD to build a vending machine~~

my vending machine function is:

1.choose the product with keypad(can choose multi-product in one times)

2."*"use as cancel the order and “#” use as confirm order

3.LCD will display the total cost of product

4.insert coin to coin acceptor untill reach the total cost

5.after reach the total cost，servo will start function 1 by 1

my component list

1.LCD 1602C

2.SERVO AS3103

3.KEYPAD 3X4

4.COIN ACCEPTOR 6types

#include <Keypad.h>
#include<Servo.h>

Servo myservo;
int pos = 0;
const byte ROWS = 4;
const byte COLS = 3;

char keys [ROWS] [COLS] = {
  {'1', '2', '3',},
  {'4', '5', '6',},
  {'7', '8', '9',},
  {'*', '0', '#',}
};

byte rowPins[] = { 9, 8, 7, 6 };
byte colPins[] = { 12, 11, 10 };
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

#define ledpin 13

void setup()

{
  myservo.attach(2);
  myservo.write(pos);
  Serial.begin(9600);
}

void loop()
{
  char key = kpd.getKey();
  if (key) // Check for a valid key.
  {
    switch (key)
    {
      case '1':
        Serial.println(key);
        pos = 0;
        myservo.write(pos);

        break;

      case '2':

        Serial.println(key);
        pos = 5;
        myservo.write(pos);
        delay(1375);
        pos = 0;
        myservo.write(pos);

        break;

      case '3':

        Serial.println(key);

        break;

      case '4':

        Serial.println(key);

        break;

      case '5':

        Serial.println(key);

        break;

      case '6':

        Serial.println(key);

        break;

      case '7':

        Serial.println(key);

        break;

      case '8':

        Serial.println(key);

        break;

      case '9':

        Serial.println(key);

        break;

      case '0':

        Serial.println(key);

        break;

      case '*':

        Serial.println(key);

        break;

      case '#':

        Serial.println(key);

        break;

    }

  }
}

i only know use the case “1” start the servo and case"2" stop the servo

i dont know where to start to write the 1st function, pls give me some suggestion

ty for helping~~~

2

First of all, barring some odd mechanical arrangement, you will need one servo per product.

Do a search on how to write a state machine; that will be the best way to handle this. You have already listed many of the states, pretty much in order, of what you need to do, though some steps will turn into more than one state. Step 4, for example, will become “get input form coin acceptor”, “add to total deposited”, “show total deposited so far on LCD”, “go to step 5 when enough has been deposited” (what about change and coin return?). Step 5 is simply “for each product purchased, turn on its servo for enough time to dispense the product, then turn it off”.

/mike