释放双眼，带上耳机，听听看~！
这个例子示范了用呼叫响应（握手）方式从Arduino 或Genuino开发板到电脑的串口通讯。
目录
简介
- 这个例子示范了用呼叫响应（握手）方式从Arduino 或Genuino开发板到电脑的串口通讯。
- 这个程序在启动时发送一个ASCII 字符串，并且等它收到来自电脑的串口回应时重发。然后，它发送三个传感值作为 ASCII解码的数字（逗号分开，换行+回车结束），并且等待电脑的另一个回应。
- 你可以用Arduino IDE串口监视器来观察发送的数据，或者用Processing, Flash, PD, Max/MSP （看下面例子）等等来读取。下面的例子用逗号分开输入的字符串，并转换成字符串重新输入到数字里。
- 比较这个和串口呼叫响应例子。他们在共同使用的握手方式上很相似，但这个把读到的传感值作为字符串解码，而另一个作为二进制值发送。而发送像ASCII-encoded的字符串承载更多的字节，这意味着你可以很容易发送比255更大的字节的传感器读取值。它同样容易在串口终端程序里读取。
硬件要求
- Arduino or Genuino 开发板
- 2 *模拟传感器 (电位计, 光敏电阻, FSR 等)
- 按键
- 3* 10KΩ 电阻
- 连接线
- 面包板
软件要求
- Processing 或者 Max/MSP version 5
电路
- 把模拟传感器（作为分压器）通过10kΩ电阻连接到模拟引脚PIN0和PIN1。
- 把一个按键或者开关连接到数字I/O口pin2，并通过一个10kΩ电阻下拉到地。
原理图
样例代码
int firstSensor = 0; // first analog sensor
int secondSensor = 0; // second analog sensor
int thirdSensor = 0; // digital sensor
int inByte = 0; // incoming serial byte
void setup() {
// start serial port at 9600 bps and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
pinMode(2, INPUT); // digital sensor is on digital pin 2
establishContact(); // send a byte to establish contact until receiver responds
}
void loop() {
// if we get a valid byte, read analog ins:
if (Serial.available() > 0) {
// get incoming byte:
inByte = Serial.read();
// read first analog input:
firstSensor = analogRead(A0);
// read second analog input:
secondSensor = analogRead(A1);
// read switch, map it to 0 or 255L
thirdSensor = map(digitalRead(2), 0, 1, 0, 255);
// send sensor values:
Serial.print(firstSensor);
Serial.print(",");
Serial.print(secondSensor);
Serial.print(",");
Serial.println(thirdSensor);
}
}
void establishContact() {
while (Serial.available() <= 0) {
Serial.println("0,0,0"); // send an initial string
delay(300);
}
}
/*
Processing code to run with this example:
// This example code is in the public domain.
import processing.serial.*; // import the Processing serial library
Serial myPort; // The serial port
float bgcolor; // Background color
float fgcolor; // Fill color
float xpos, ypos; // Starting position of the ball
void setup() {
size(640,480);
// List all the available serial ports
// if using Processing 2.1 or later, use Serial.printArray()
println(Serial.list());
// I know that the first port in the serial list on my mac
// is always my Arduino module, so I open Serial.list()[0].
// Change the 0 to the appropriate number of the serial port
// that your microcontroller is attached to.
myPort = new Serial(this, Serial.list()[0], 9600);
// read bytes into a buffer until you get a linefeed (ASCII 10):
myPort.bufferUntil('\n');
// draw with smooth edges:
smooth();
}
void draw() {
background(bgcolor);
fill(fgcolor);
// Draw the shape
ellipse(xpos, ypos, 20, 20);
}
// serialEvent method is run automatically by the Processing applet
// whenever the buffer reaches the byte value set in the bufferUntil()
// method in the setup():
void serialEvent(Serial myPort) {
// read the serial buffer:
String myString = myPort.readStringUntil('\n');
// if you got any bytes other than the linefeed:
myString = trim(myString);
// split the string at the commas
// and convert the sections into integers:
int sensors[] = int(split(myString, ','));
// print out the values you got:
for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
print("Sensor " + sensorNum + ": " + sensors[sensorNum] + "\t");
}
// add a linefeed after all the sensor values are printed:
println();
if (sensors.length > 1) {
xpos = map(sensors[0], 0,1023,0,width);
ypos = map(sensors[1], 0,1023,0,height);
fgcolor = sensors[2];
}
// send a byte to ask for more data:
myPort.write("A");
}
*/
/*
Max/MSP version 5 patch to run with this example:
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-----------end_max5_patcher-----------
*/Processing 代码
从上面代码里复制Processing程序。随着你改变模拟传感器的值，你会获得一个在显示屏上运动的球，像这样。这个球只在你按下按钮时出现：
Max 代码
max patch看起来像这样。 从上面代码里复制Max代码，粘贴到一个新的Max窗口。
