This project creates a piezo buzzer circuit that can play "Never Gonna Give You Up" by Rick Astley, also known as rickrolling! This works by playing the frequences of the notes in the song on the piezo.

---

🛠️ เจาะลึกเบื้องหลังการทำงาน (Deep Dive / Technical Analysis)

The Rickroll Piezo Buzzer project is a hilarious way to learn about arrays, frequencies, and digital audio. By transcribing the sheet music for Rick Astley's "Never Gonna Give You Up," you can hide a tiny Arduino anywhere to pull off the ultimate geeky prank.

Converting Music to Code

Music on an Arduino is essentially just math.

1. The Reference: You use a pitches.h file that defines notes as frequencies (e.g., NOTE_D4 294).
2. The Melody Array: You create an array representing the exact sequence of notes in the song's chorus.
3. The Rhythm Array: You create a second array representing the duration of each note (quarter notes, eighth notes).
4. The Execution: A for loop plays each note for the calculated duration using the tone() function.

Hardware Needed

• Arduino Uno/Nano or even an ATtiny85 for a super-small prank device.
• Passive Piezo Buzzer: Essential—it must be passive to play different tones.
• 100-ohm Resistor: For volume control and pin protection.
• Battery Pack (e.g., 9V or Coin Cell): To make the device portable and easy to hide.

The Perfect Trap

To make the prank even better, you can add an LDR (Photoresistor) or an IR Sensor. Program the Arduino to stay completely silent until someone opens a drawer or walks past it, at which point it starts blasting the song!