### Project 06: Music Party

![Img](./media/A1317.png)

#### 1. Overview

When we clap our hands, the microphone on the board picks up sound signals, and the speaker plays a cheerful birthday song while the RGB LED emits dazzling light.

#### 2. Components

| ![Img](./media/A850.png)| ![Img](./media/A858.png) | ![Img](./media/A906.png) |
| :--: | :--: | :--: |
| micro:bit board *1 | micro:bit T-type expansion board *1 | micro USB cable *1 |
| ![Img](./media/A500.png)| ![Img](./media/A944.png) | ![Img](./media/A950.png) |
| red LED *1 | 220Ω resistor *3 | jump wire *2 |
| ![Img](./media/A017.png) | ![Img](./media/A024.png) | ![Img](./media/A621.png)  |
| breadboard *1 |battery holder *1 <br> (<span style="color: rgb(255, 76, 65);">self-provided AA batteries *2</span>)| RGB card *1 |

#### 3. Components Knowledge

**Microphone**

A high-quality digital microphone is integrated on the front side of the micro:bit V2 board to detect sound and audio signals. The chip that controls and processes the microphone is on its back.

![Img](./media/A1317.png)

The microphone is in a small round hole on the front of the board, which is convenient to capture surrounding sound signals. Just place the micro:bit board face up when using. Next to the hole is a microphone LED indicator. When the micro:bit measures sound levels, the indicator will light up.

![Img](./media/A116.png)

**RGB LED**

![Img](./media/A2127.png)

RGB LED is imaged in the intersection of three primary colors (RGB): red, green and blue. Most colors can be synthesized by RGB in different proportions. The red, green and blue LEDs are packaged in a transparent plastic case to emit colors of light by changing the input voltage of R, G and B pins.

![Img](./media/A137.png)

**Trichromatic theory:**

![Img](./media/A150.png)

RGB LED can be divided into two types: common anode and common cathode:

In a common cathode RGB LED, the three LEDs share a negative connection (cathode);

In a common anode RGB LED, the three LEDs share a positive connection (anode).

![Img](./media/A209.png)

<span style="color: rgb(255, 76, 65);">**Note: Herein, we provide a common cathode RGB LED.**</span>

**RGB LED pins:**

RGB LED boasts 4 pins: GND(the longest one), R(red), G(green) and B(blue). Place the RGB LED as shown below, pins from left to right are red, GND, green and blue.

![Img](./media/A239.png)

#### 4. Wiring Diagram

![Img](./media/A308.png)

![Img](./media/A325.png)

#### 5. Code Flow

![Img](./media/A343.png)

#### 6. Test Code

The code file is provided in folder Project 06：Music Party, file Project-06-Music-Party.hex.

![Img](./media/A423.png)

**Load code blocks:**

![Img](./media/A445.png)

#### 7. Test Result

After downloading the code to the board, when we clap our hands, the microphone on the board picks up sound signals, and the speaker plays a cheerful birthday song while the RGB LED emits dazzling light. Isn’t the music party in a happy and joyful atmosphere?

<span style="color: rgb(255, 76, 65);">**ATTENTION:** If the wiring is correct but you cannot see the results, press the reset button on the back of the board.</span>

![Img](./media/A757.gif)