/*Analog InputDemonstrates analog input by reading an analog sensor on analog pin 0 andturning on and off a light emittingdiode(LED) connected to digital pin 13.The amount of time the LED will be on and off depends on the value obtainedby analogRead().The circuit:- potentiometercenter pin ...
{//将连接LED的引脚设置为输出模式pinMode(ledPin, OUTPUT); }voidloop() {//读取引脚A0的输入信号,并将该数值赋给变量valval =analogRead(A0);//将引脚A0读取的数值转换为0-255之间//并将该数值写入引脚3analogWrite(ledPin, val /4); } 04 将模拟输入值 映射 为模拟输出值 map(analog,0,1023,0,255...
const int analogInPin = A0; // Analog input pin that the potentiometer is attached to const int analogOutPin = 9; // 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...
D2 ---> DO (Digital Output, 可选) 示例代码 constintanalogPin = A0;// 声音传感器模块的模拟信号引脚连接到A0constintdigitalPin =2;// 声音传感器模块的数字信号引脚连接到D2(可选)voidsetup(){pinMode(digitalPin, INPUT);// 设置数字引脚为输入(可选)Serial.begin(9600);// 启动串口通信}voidloop...
const int analogOutPin = 9; // 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: ...
1.analogRead ( pin ) : ① 模拟输入引脚是带有ADC(Analog-to-Digital Converter,模数转换器)功能的引脚。 ②它可以将外部输入的模拟信号转换为芯片运算时可以识别的数字信号,从而实现读入模拟值的功能。 ③模拟输入功能需要使用analogRead() 函数。 参数:参数pin是指定要读取模拟值的引脚,被指定的引脚必须是模拟输入...
* center pin of the potentiometer to the analog pin * one side pin (either one) to ground * the other side pin to +5V * LED anode (long leg) attached to digital output 13 * LED cathode (short leg) attached to ground * Note: because most Arduinos have a built-in LED attached ...
pinMode(A0,OUTPUT)...temp = analogRead(A0)想请问为什么将传感器输出口连接的A0设置为OUTPUT?这里不是用作数据输入吗,应该是INPUT把?不过我试了一下设置为OUTPUT和INPUT获取的数值差不多。是不是模拟口在没有Write过数据前设置IN/OUT没有差别呢?请问是什么原理。附上官网对于AnalogPin的一段话,也是要求在analog...
int ledPin = 9; // LED连接到数字引脚9 int analogPin = 3; //电位器连接到模拟引脚3 int val = 0; //定义变量存以储读值 void setup() { pinMode(ledPin,OUTPUT); //设置引脚为输出引脚 } void loop() { val = analogRead(analogPin); //从输入引脚读取数值 analogWrite(ledPin,val / 4);...
模拟输出 Analog output analogWrite(pin, value) 在已有的引脚上使能软件PWM功能。PWM可以用在引脚0~16。调用analogWrite(pin, 0) 可以关闭引脚PWM。取值范围:0~ PWMRANGE,默认为1023。 PWM 范围可以使用analogWriteRange(new_range)语句来更改。 PWM 默认频率:1KHz。使用analogWriteFreq(new_frequency) 可以更改频率...