arduino ibox项目实战20－AnalogInOutSerial实验 - 九鼎创展论坛

实验目标：通过电位器旋转改变模拟电压，程序通过模拟电压的变化进而控制LED灯的亮度，并通过调试窗口将模拟电压转换的数字信号和对应的LED亮度值显示出来。

// These constants won't change. They're used to give names
// to the pins used:
const int analogInPin = A0; // Analog input pin that the potentiometer is attached to
const int analogOutPin = PWM0; // Analog output pin that the LED is attached to
int sensorValue = 0; // value read from the pot
int outputValue = 0; // value output to the PWM (analog out)
void setup() {
// initialize serial communications at 9600 bps:
Serial.begin(9600);
}
void loop() {
// read the analog in value:
sensorValue = analogRead(analogInPin);
// map it to the range of the analog out:
outputValue = map(sensorValue, 0, 1023, 0, 255);
// change the analog out value:
analogWrite(analogOutPin, outputValue);
// print the results to the serial monitor:
Serial.print("sensor = " );
Serial.print(sensorValue);
Serial.print("\t output = ");
Serial.println(outputValue);
// wait 2 milliseconds before the next loop
// for the analog-to-digital converter to settle
// after the last reading:
delay(2);
}

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在setup函数中，设置串口波特率为9600，在loop函数中通过analogRead函数读取模拟电压的值，然后通过map函数映射出和读取出来的电压值一一对应的LED亮度值，并通过PWM0输出对应脉宽的波形，从而控制LED灯的亮度。最终通过Serial.print函数将相关的值打印出来。