### Project 26 Human Body Piano

**1. Description**

The analog piano includes a development board and an ultrasonic sensor. It enables to play different tones by detecting the position of your fingers. Thus, this module is able to stimulate a piano to perform music and songs. 

**2. Flow Chart**

![](media/B101.png)

**3. Wiring Diagram**

![](media/B102.png)

**4. Test Code**

Assign the distance value to item, and the played tones vary from distance. Seven tones are included: Do，Re，Mi，Fa，So，La，Si.

![](media/B103.png)

**5. Test Result**

Connect the wirings and upload the code. 

- Play Do when the distance is less than 10. 
- Play Re when the distance is within 10~20. 
- Play Mi when the distance is within 20~30. 
- Play Fa when the distance is within 30~40. 
- Play So when the distance is within 40~50. 
- Play La when the distance is within 50~60. 
- Play Si when the distance is within 60~70.