查看“Lesson 45--Microduino Electric Guitar”的源代码

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==Objective==
This tutorial will show you how to use ultrasonic sensor to make an electric guitar. 

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-USBTTL]]'''

*Other harware equipment  
**USB cable   One  
**Ultrasonic sensor           One 
**Loudspeaker           One 
**10KΩ resistor           One 
**Breadboard jumpers           several
**Battern           One 


==Note Frequency==
We all know that the notes Do - Re - Mi - Fa - Sol - La - Si/Te have their correspsonding frequencies, seeing at the two tables below:

[[File:NoteFrequency1.jpg|600px|center|thumb]]
[[File:NoteFrequency2.jpg|600px|center|thumb]]



==Schematic==
[[File:ElectricGuitarSchematics.jpg|600px|center|thumb]]


==Program==

[https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Advanced/guitar guitar]

In the program,int toneFrequency[]={415,440,466,494,523,554,587,622};

It is used to define the range and number that can generate notes. You can adjust the note frequency range according to individual needs.


==Debugging==

1. Download Tone library: [https://github.com/johnmccombs/arduino-libraries/tree/master/Tone Tone], and put it into libraries of IDE and then restart IDE. Compared with the built-in Tone, this Tone library can output waves with different frequency at the same time.   
 

'''Caution: Decompress and change #include <wiring.h> in Tone.cpp to #include <Arduino.h>, or it'll cause errors. 

2. Build the circuit according to schematic:  

[[File:ElectricGuitarConnect.jpg|600px|center|thumb]]
You can mark the location of notes accordin to note frequency on the battern.

3. Download and run the code  

4. move the obstruction in front of ultrasonic and pay attention to the loudspeaker.    

==Result==

The loudspeaker will generate different notes according to different locations of the obstruction, which is basically the same with the note on the battern.  


==Video==


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