Halloween Pumpkin Pay - NFC Enabled Pumpkins

So Apple Pay is hot right now right? Well, this year at my house kids used Pumpkin Pay instead! Ok so I didn't distribute NFC pumpkins for all.

Instead I made a simple game. Pick the "Magic Pumpkin", if you get it right the first time you can choose from the "special" candy bowl (the one with full size candy bars). If you don't get it the first time you can pick from the "generic" candy bowl. So everybody wins. Kids had a blast trying to figure out the "magic" formula.

If the winner pumpkin was chosen I used the Phillips Hue Lights and cheering sounds to let the kids know they "won". If they choose the incorrect one the lights turn red and a error sounds was played over my PA.

Of course after every win, the winner pumpkin changes by choosing a random (1 of 3) NFC tags.

Step 1: Materials

• Raspberry Pi (with power adaptor)
• Raspberry Pi Ribbon Cable
• Audio Jack extender cable
• ITEAD PN532 NFC MODULE
• Type 2 NFC Tags
• Cardboard box
• Black fabric
• 3 Small Pumpkins
• Phillips Hue Lights

Step 2: The Code

This time I used Java. I have place the whole NetBeans Project here https://github.com/noelportugal/NFCHalloween

Here is the Main class:

package com.noelportugal.halloween.nfc;

import com.noelportugal.halloween.hue.HueBridgeLink;
import com.noelportugal.halloween.hue.HueBridgeLinkCallback;
import com.philips.lighting.hue.sdk.PHHueSDK;
import com.philips.lighting.hue.sdk.utilities.PHUtilities;
import com.philips.lighting.model.PHBridge;
import com.philips.lighting.model.PHLight;
import com.philips.lighting.model.PHLightState;
import java.util.List;
import java.util.Random;


public class Main implements HueBridgeLinkCallback {
    static final byte PN532_MIFARE_ISO14443A = 0x00;
    static final String defaultColor = "0 0 0";
    
    private Random rand = new Random();

    private static PHHueSDK phHueSDK;
    private static PHBridge bridge;
    private static PHLightState lightState;
    private static final int maxBrightness = 254;
    private static final int minBrightness = 15;
    
    // Change to match your NFC tags
    private static final String[] UIDS = {
        "36076607291754756", 
        "36358082404879876",
        "36358082404944388"
    };
    
    private static final String[] GROUPS = {
        "AL", // 1
        "BM", // 2
        "CD", // 3
        "E",   // 4
        "FGHIJK",   // 5
    };  
    private static final int[][] GROUP_COLORS = {
        {0,255,0}, // 1 Green
        {255,0,0}, // 2 Red
        {50,0,255}, // 3 Blue
        {200,255,0}, // 4 Yellow
        {255,0,255}, // 5 Purlple
    };
    private static final int MAX_HUE = 65535;
    private int randomColor;
    
    public Main(){
        // Prepare the Hue Bridge link
        HueBridgeLink bridgeLink = new HueBridgeLink();
        bridgeLink.connect(this);
        phHueSDK = PHHueSDK.getInstance();
    
    }
    
    @Override
    public void onBridgeReady() {
        bridge = phHueSDK.getSelectedBridge();
        allOff();
    }
    
    private static float[] rgbGroupColor (int[] groupColors, PHLight light) {
        return PHUtilities.calculateXYFromRGB(groupColors[0], groupColors[1], groupColors[2], light.getModelNumber());
    }
    
    private static long getDec(byte[] bytes) {
        long result = 0;
        long factor = 1;
        for (int i = 0; i < bytes.length; ++i) {
            long value = bytes[i] & 0xffl;
            result += value * factor;
            factor *= 256l;
        }
        return result;
    }
    
    private void start() throws InterruptedException{
        IPN532Interface pn532Interface = new PN532Spi();
        PN532 nfc = new PN532(pn532Interface);
        
        System.out.println("Starting up...");
        nfc.begin();
        Thread.sleep(1000);

        long versiondata = nfc.getFirmwareVersion();
        if (versiondata == 0) {
            System.out.println("Didn't find PN53x board");
            return;
        }
        
        System.out.print("Found chip PN5: ");
        System.out.println(Long.toHexString((versiondata >> 24) & 0xFF));
	System.out.print("Firmware versioin: ");
        System.out.print(Long.toHexString((versiondata >> 16) & 0xFF));
        System.out.print('.');
        System.out.println(Long.toHexString((versiondata >> 8) & 0xFF));
        // configure board to read RFID tags
        nfc.SAMConfig();
        System.out.println("Station ready to Scan");
        byte[] buffer = new byte[8];
        
        String winner = UIDS[rand.nextInt(2)];

        
        while (true) {
            int readLength = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, buffer);

            if (readLength > 0) {
                String uid = "";
                System.out.print("    UID: ");
                uid = String.valueOf(getDec(buffer));
                System.out.println(uid);
                
                try {
                                   

                    if (uid.equals(winner)){
                        Runtime.getRuntime().exec(new String[]{"/usr/bin/mpg321", "-q","/home/pi/Sounds/win1.mp3"});
                        win();
                        winner = UIDS[rand.nextInt(2)];
                    }else{
                        Runtime.getRuntime().exec(new String[]{"/usr/bin/mpg321", "-q","/home/pi/Sounds/fail.mp3"});
                        fail();
                    }
                    
                    
                    // wait for 1 seconds before next scan
                    Thread.sleep(1000);
                    System.out.println("Station ready to Scan");
                } 
                catch (Exception ex) {
                    System.err.println(ex.getMessage());
                }
            }
            // sleep for 200 ms before going back to scan for NFC tag
            Thread.sleep(200);
        }
        
    }
    
    private void allOff(){
        lightState = new PHLightState();
        lightState.setOn(false);
        bridge.setLightStateForDefaultGroup(lightState);
    }
    
    private void fail() throws InterruptedException{
        lightState = new PHLightState();
        lightState.setOn(true);
        lightState.setHue(65280);
        bridge.setLightStateForDefaultGroup(lightState);
        Thread.sleep(2000);
        allOff();
        
    }
    private void win(){
                    System.out.println("Starting Random Light Thread");
            PHBridge bridge = phHueSDK.getSelectedBridge();
            List<PHLight> allLights = bridge.getResourceCache().getAllLights();
            Random rand = new Random();
            
            int i =0;
            while (i++ < 6) {
                System.out.println("while loop: " + i);
                try {
                    PHLightState lightState = new PHLightState();
                    lightState.setOn(true);
                    randomColor = rand.nextInt(MAX_HUE);
                    lightState.setBrightness(maxBrightness);
                    lightState.setHue(randomColor);
                    bridge.setLightStateForDefaultGroup(lightState);
                    Thread.sleep(1000);
                } catch (Exception ex) {
                    System.err.println("error:" + ex.getMessage());
                }
            }
            
            allOff();

    }
       
    
    public static void main(String[] args) throws InterruptedException {
        System.out.println("Starting Exchange Hue Lights Server");
        Main halloween = new Main();
        halloween.start();
    }
    

}

Step 3: Setup

Thats basically it! Just put your RPI inside a box, make a hole for the NFC reader. Put some tape to secure it. And decorate with black fabric. Simple!