Arduino示例代码讲解：Project 07 - Keyboard 键盘
- Project 07 - Keyboard 键盘
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- 程序功能概述
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- 功能：
- 硬件要求：
- 输出：
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- 代码结构
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- 全局变量
- `setup()` 函数
- `loop()` 函数
- 读取电位器值：
- 打印电位器值：
- 播放音调：
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- 运行过程
- 注意事项
Project 07 - Keyboard 键盘
/*
Arduino Starter Kit example
Project 7 - Keyboard
This sketch is written to accompany Project 7 in the
Arduino Starter Kit
Parts required:
two 10 kilohm resistors
1 Megohm resistor
220 ohm resistor
4 pushbuttons
piezo
Created 13 September 2012
by Scott Fitzgerald
http://arduino.cc/starterKit
This example code is part of the public domain
*/
// create an array of notes
// the numbers below correspond to
// the frequencies of middle C, D, E, and F
int notes[] = {
262, 294, 330, 349};
void setup() {
//start serial communication
Serial.begin(9600);
}
void loop() {
// create a local variable to hold the input on pin A0
int keyVal = analogRead(A0);
// send the value from A0 to the Serial Monitor
Serial.println(keyVal);
// play the note corresponding to each value on A0
if (keyVal == 1023) {
// play the first frequency in the array o
