### 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\.py.

![Img](./media/A3523.png)

**Complete code:**

```python
'''
Function: Clap your hands, the microbit microphone receives the sound signal, the music sounds, and the RGB emits a dazzling light to simulate a musical party
Compiling IDE: MU 1.2.0
Author: https://docs.keyestudio.com
'''
# import related libraries
from microbit import *
import music

display.clear() # clear LED matrix

while True:
    if microphone.current_event() == SoundEvent.LOUD:  # If the microphone picks up a loud signal
       music.play(["G3:4", "G3", "A4"]) # the speaker plays some tones
       pin1.write_analog(1023)      # P1 analog value is 1023,RGB is red
       pin2.write_analog(0)
       # pin3.write_analog(0)
       sleep(100)
       music.play(["G4:4", "C5", "B4"])
       pin1.write_analog(0)         # P1 analog value is 0,RGB is not red
       pin2.write_analog(1023)      # P2 analog value is 1023,RGB is green
       # pin3.write_analog(0)
       sleep(100)
       pin1.write_analog(10)
       pin2.write_analog(10)
       # pin3.write_analog(1023)      # P3 analog value is 1023,RGB is blue
       sleep(100)
       music.play(["G4:4", "D5", "C5"])
       pin1.write_analog(123)
       pin2.write_analog(123)
       # pin3.write_analog(0)
       sleep(100)
       music.play(["G4:4", "D5", "C5"])
       pin1.write_analog(1023)
       pin2.write_analog(400)
       # pin3.write_analog(1023)
       sleep(100)
       music.play(["G3:4", "G3", "G4"])
       pin1.write_analog(10)
       pin2.write_analog(1023)
       # pin3.write_analog(1023)
       sleep(100)
       pin1.write_analog(1023)
       pin2.write_analog(1023)
       # pin3.write_analog(1023)
       sleep(100)
       music.play(["E5:4", "C5", "B4", "A4"])
       pin1.write_analog(32)
       pin2.write_analog(184)
       # pin3.write_analog(336)
       sleep(100)
       pin1.write_analog(640)
       pin2.write_analog(328)
       # pin3.write_analog(180)
       sleep(100)
       music.play(["F5:4", "F5", "E5"])
       pin1.write_analog(552)
       pin2.write_analog(172)
       # pin3.write_analog(904)
       sleep(100)
       pin1.write_analog(1020)
       pin2.write_analog(796)
       # pin3.write_analog(560)
       sleep(100)
       music.play(["C5:4", "D5", "C5"])
       pin1.write_analog(136)
       pin2.write_analog(560)
       # pin3.write_analog(140)
       sleep(100)
       pin1.write_analog(0)
       pin2.write_analog(0)
       # pin3.write_analog(0)
       sleep(100)
if microphone.current_event() == SoundEvent.QUIET:  # If the microphone picks up a quie signal
       pin1.write_analog(0)
       pin2.write_analog(0)
```

#### 7. Test Result

Click “<span style="color: rgb(255, 76, 65);">Flash</span>” to load the code to the micro:bit board.

![Img](./media/A3540.png)

After downloading the code to the board, **power on via micro USB cable or external power supply(turn the DIP switch to ON)**, and press the reset button on the board.

![Img](./media/A455.png)

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)