SpotifyMin and Locking System

Hello, my name is Jeevan and today I'll be showing off my final project, SpotifyMin. SpotifyMin is a Spotify controller using an Arduino Uno. It uses RFID tags, push buttons, and a potentiometer to manage Spotify playback seamlessly. This system allows users to control play/pause, skip to the next or previous track, adjust the volume, and switch between playlists using RFID tags.

As an avid music enthusiast, I spend over 3 hours a day listening to music. When presented with the opportunity to create any project for my Grade 12 Computer Engineering Final Summative, I saw it as the perfect chance to channel my creativity and passion for music into a functional and exciting project. SpotifyMin combines my love for music with my interest in engineering, allowing me to explore and innovate in a field I am passionate about.

To succeed in creating this project, it is advised that you are familiar with C++ and Python.

This idea was made using inspiration from this project on YouTube.

I first decided that I wanted to make this project on Arduino, rather than Raspberry Pi. This was because I was just much more familiar with Arduino. I decided on making a locking system with gates, I used previous knowledge from my SOP summative to find a way to make the gates use 1 specific lock code. I spent some time researching how to create my project, even apart from the YouTube video I linked above. I saw some very old videos that even used LCD's to display the song playing, and that would be a next step for me.

1. Solderless Full Breadboard ($6.50)
2. Solderless Breadboard Small ($5.50)
3. Arduino Uno R3 ($19.95)
4. RC522 RFID Sensor ($5)
5. Pushbutton Switch(3) ($0.45)
6. Potentiometer ($1.05)
7. Common Anode RBG LED ($2.25)
8. 330Ω Resistor (5) ($1.05)
9. Male to Female Jumper Wire (8) ($4.95)
10. 10K Ω Resistor (8) ($1.25)
11. SN74LS08N AND Chip (2) ($1.42)
12. SN7404N NOT Chip ($3.42)
13. DIP Switch (2) ($3.23)
14. Buzzer ($2.10)

You will also need a decent bit of wiring.

*All prices above refer to a quantity of 1 of the objects or the price of them in a pack.

This is the schematic made for this project. On the left you have the locking system made of gates. On the right you have the push buttons used to control Spotify, as well as the potentiometer used to control volume. The RGB LED is controlled using the potentiometer, but the input from the potentiometer is sent to the Arduino, and the Arduino format's it to make a specific color combination on the RGB LED.

To start making the locking system, put down 2 4-SPST DIP Switches, connect power to all of the DIP Switch legs on one side. On the other side, plug them into ground with 10K Ohm Resistors.

After that, add a hex inverter and 2 AND gates to the breadboard. For the hex inverter, attach a 330 resistor on the vcc pin and ground pin and connect them to their respective rails. For the and gates, simply connect their power and ground legs to the power and ground rails.

Then connect the pins that you are NOT using in your security lock code, to the hex inverter. In my case, my code is 1 3 1 3, So I connected 2 4 2 4 to the hex inverter.

Connect the outputs from the hex inverter to the AND gate. Also connect the DIP Switch pins from your code to the AND Gates. Ideally, you want a 4 digit code.'

Connect the outputs of the AND chip together in the second AND Chip, then add both of those outputs together in the same chip. This process is shown above.

The final step in creating the locking system is connecting it to the Arduino. In the code that you will learn about later in this Instructable, we set the pin for the locking system to A0. Therefore, connect the final output to the A0 pin on your Arduino. I also decided to change one of the resistors on the NOT gate into direct power. I also added a buzzer that plays when the locking system is locked. I achieved this by putting the output of the locking system into a NOT gate, and plugging the output of the Not gate into the power of the buzzer. This way, if the output of the locking system is high, the output of the NOT gate will be low.

To get started with SpotifyMin, first place 3 pushbuttons and wire them to power and ground, ensure you use a resistor for the ground connection. These push buttons will be your "Previous", "Pause/Play", and "Next" buttons from left to right. The first button connects to 2 on the Arduino, the second button connects to 7, and the third button connects to 4.

For the second step in wiring, add your potentiometer. This is connected to ground and power (No need for a resistor). The middle pin of the potentiometer is connected to the A5 pin on the Arduino.

Now we add our common anode RGB LED. Because the RGB LED is common anode, the middle left pin goes to power. R (Far left) goes to 6, G (Middle right) goes to 3, and B (Far right) goes to 5.

Finally, we have the last wiring portion of the project. To connect the RFID to your Arduino you must use jumper cables to connect each wire to the Arduino. First I will tell you the pin on the RFID, then I will tell you where to place it on your Arduino.

The VCC pin goes to the 3.3V pin.

RST goes to pin 8.

GND goes to GND.

MISC goes to pin 12.

MOSI goes to pin 11.

SCK goes to pin 13.

NSS goes to pin 10.

The IRQ pin is not used.

Congratulations!

You've finished wiring SpotifyMin.

Starting with our Libraries and Declarations.

The SPI.h libarary lets the Arduino communicate using the Serial Peripheral Interface protocol.

The MFRC522.h Library is used to read the RFID tags. This library can be installed here.

Moving on, we define the Reset (RST) pin and the Slave Select (SS) pins for the RFID sensor.

MFRC522 mfrc522(SS_PIN, RST_PIN); This is a class and is used to communicate with the RFID.

After that, we declare our pins. You may realize the pin "cd", this refers to our DC Motor.

You can also find a pin being declared as "lock". "lock" refers to the locking system we made earlier in the Instructable.

Finally, we have 2 boolean statements. These are used to track the "Pause/Play" button's state. We use the state of that button to determine whether or not the DC Motor will spin. When it is playing the Motor spins, when it isn't playing the motor will stop, much like a record player.

Serial.begin(9600); is used to work with serial communications

SPI.begin(); Initializes the serial peripheral interface bus

mfrc522.PCD_Init(); Initializes the RFID

Then we setup our pins as normal.

All controls are input devices. (Pause/Play, Previous, Next, Volume, and the locking system)

The r, g, b, and cd are all output.

We then have a line that prints a "Scan an RFID tag" message. This only happens once.

This line of code is how we apply the locking system we made earlier in the Instructable. If the lock doesn't have the write code inputted, the whole system will not work. However, if the write code is inputted, the system will function like normal.

Check for New Cards:

1. if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()): This checks if a new RFID card is present and reads its serial number.

Read and Print Card UID:

1. Serial.print("UID tag: ");: Prints the UID of the detected RFID card.
2. The for loop reads each byte of the card's UID, formats it as a hexadecimal string, and appends it to the content string.
3. content.toUpperCase();: Converts the UID string to uppercase.
4. Serial.println(content);: Prints the full UID string.

if (content == "B5E7FBD1"): If the UID matches "B5E7FBD1", print "Rebirth" to the serial monitor and wait for 1 second. This is also the same for the second playlist but it has different values.

Be sure to replace the codes and the playlist names with your personal RFID codes and playlists.

The "Play/Pause', "Next", and "Previous" codes all work the same, they use a simple if statement to check if the button was pressed. If a button is pressed then a message is sent to the serial monitor which gets sent to Python which then acts on Spotify.

We also have the portion of the code for our volume.

We read the input coming from the A5 pin. This value ranges from 0 to 1023. We then map that value to 0 to 100.

This code uses the volume to control the colors of the RGB led. This can be manipulated and changed to whatever color you want.

To get started with Python, you can download it from the Microsoft store here.

After you download Python, simply follow the instructions on the screen from the install wizard.

After downloading Python, you need an IDE to work with Python. For this project, I used Visual Studio Code which you can download here.

Again, follow the install wizard and complete the download.

When you open Visual Studio Code you will get the option to make a new Python project.

Make a new project and name it whatever you want.

Ensure you have Python installed.

A common issue I had whenever switching over devices, was VSCode not recognizing Python, to fix this problem, simply paste this into the terminal.

python --version

It will tell you your current version of Python.

Then paste this to ensure pip is installed

python -m pip install --upgrade pip

After ensuring Python is installed, locate the terminal in the bottom hotbar.

Then type this into the terminal.

pip install spotipy pyserial pynput

Any imports at the top refer to importing libraries. Much like Arduino code

Any code that refers to logging helps keep the terminal clear from Spotipy, making it easier to identify errors.

The Spotify API credentials are your unique codes.

At the bottom of this block of code, you can find a cache code. This is so you can save the localhost url. If this code isn't there, you will constantly be sent to the local host page.

When setting up your serial connections, ensure you are using the right port. I used port 4 on my computer. When you use Arduino your port should pop up in the Arduino IDE.

We then use the serial communication from the Arduino IDE to receive commands and execute them on Spotify.

The third image of the code is for the RFID.

When your Python code retrieves your playlist name from the serial monitor it will play the playlist your have connected to the tag. It does this by using your playlist url. Ensure your playlist names sent to the serial monitor are the exact same on the Arduino IDE and on the Python Code.

First create a Spotify Developer account. Go to the Spotify Developer Dashboard here.

Then create a new application by pressing the create an app button, fill out the information required and click create.

Go to settings for your app and press basic information. You should be presented with your Client ID and Secret ID at the top of the page.

Above is a video of the working project. It demonstrates the project in use with all of it's features.

Fill in any blanks in the code with your unique playlists and IDs.

The first time you run this code you will get an error and will be redirected to the local host page. Copy the url and paste it into VS Code and your code will run.

The code is attached below.

Thank you for reading and good luck!