12th Grade STEM

Original Video 

Code for Coin counter

const int pinIr10c = 2;

const int pinIr1c = 6;

const int pinIr5c = 8;

const int pinIr25c = 5;

int IRvalue10c = 0;

int IRvalue1c = 0;

int IRvalue5c = 0;

int IRvalue25c = 0;

const int pinIrStart = 6;

int pinMotor = 3;

int IRvalueStart = 0;

int coinCount = 0;

int MoneyWorth = 0;

String MessageToPrint = "c";

/* Display */

/* Include the HCMAX7219 and SPI library */

#include <HCMAX7219.h>

#include "SPI.h"

/* Set the LOAD (CS) digital pin number*/

#define LOAD 10

/* Create somewhere to store the message*/

String message = "BEEF";

/* Create an instance of the library */

HCMAX7219 HCMAX7219(LOAD);

void setup()

{

  Serial.begin(9600);

  pinMode(pinIr2c,INPUT);

  pinMode(pinIrStart,INPUT);

  pinMode(pinMotor,OUTPUT);

  //Welcome message

  byte Loopcounter;

  byte Position;

}

void loop()

{

  IRvalue10c = digitalRead(pinIr10c);

  IRvalue1c = digitalRead(pinIr1c);

  IRvalue5c = digitalRead(pinIr5c);

  IRvalue25c = digitalRead(pinIr25c);

  IRvalueStart = digitalRead(pinIrStart);

 //  if (IRvalueStart == 0) {

 //   Serial.println("Coin detected. Starting motor...");

 //   digitalWrite(pinMotor, HIGH);

 //   delay(200);

 //  }

   if (IRvalue10c == 0) {

    Serial.println("It was a 10c coin that was detected");

    coinDetected();

    MoneyWorth = MoneyWorth + 10;

    displayAmountSerial();

    displayAmount();

    delay(200);

   }

   if (IRvalue1c == 0) {

    Serial.println("It was a 1c coin that was detected");

    coinDetected();

    MoneyWorth = MoneyWorth + 1;

    displayAmountSerial();

    displayAmount();

    delay(200);

   }

   if (IRvalue5c == 0) {

    Serial.println("It was a 5c coin that was detected");

    coinDetected();

    MoneyWorth = MoneyWorth + 5;

    displayAmountSerial();

    displayAmount();

    delay(200);

   }

    if (IRvalue25c == 0) {

    Serial.println("It was a 25c coin that was detected");

    coinDetected();

    MoneyWorth = MoneyWorth + 25;

    displayAmountSerial();

    displayAmount();

    delay(200);

   }

}

void displayAmount() {

  /* Clear the output buffer of the screen */

    HCMAX7219.Clear();

    /* Write some text and output it*/

    if (MoneyWorth > 9999){

      HCMAX7219.print7Seg(MoneyWorth,6);

    }

    else if (MoneyWorth > 999){

      HCMAX7219.print7Seg(MoneyWorth,5);

    }

    else if (MoneyWorth > 99){

      HCMAX7219.print7Seg(MoneyWorth,4);

    }

    else if (MoneyWorth > 9){

      HCMAX7219.print7Seg(MoneyWorth,3);

    }

    else{

      HCMAX7219.print7Seg(MoneyWorth,2); 

    }

    HCMAX7219.print7Seg("c",1); //always add the 'c' sign

    HCMAX7219.Refresh();

}

void displayAmountSerial(){

  Serial.print("So that's ");

    Serial.print(coinCount);

    Serial.print(" coins now and the total value counted is ");

    Serial.print(MoneyWorth);

    Serial.println("c");

    Serial.println();

}

void coinDetected() {

    coinCount ++;

    digitalWrite(pinMotor, LOW);

}

1st design for counter

This is what I am using for the Coin Counter. It uses an infrared laser that when broken by a coin falling will count the value of the coin that will be different for each hole.