/*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 ...
Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu). Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground. This example code is in the public domain. https://www.arduino.cc/en/Tutorial/BuiltInExamples/ReadAnalogVolta...
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...
Demonstrates analog input by reading an analog sensor on analog pin 0 and turning on and off a light emitting diode(LED) connected to digital pin 13. The amount of time the LED will be on and off depends on the value obtained by analogRead(). The circuit: * Potentiometer attached to ana...
int analogPin=0;// A0脚接传感器 int sensor = analogRead(analogPin);//读取传感器的值，给sensor String dataString = String(sensor);//把int类型的值强制转换成String字符串，赋值给变量dataString File dataFile = SD.open("datalog.txt", FILE_WRITE);打开名为datalog.txt的文件，注意，如果SD卡中没有...
sensorValue=analogRead(analogInPin);// 读取模拟输入的值 analogRead函数读出了A0脚获取的模拟输入值,从刚才的演示中可以知道范围是0~1023。 注释:Arduino UNO的内置ADC精度是十位,用二进制表达就是十个二进制位,总信息量就是2的10次方(2^10==1024),从0开始就是0~1023了。
Center pin of the potentiometer goes to the analog pin. side pins of the potentiometer go to +5V and ground * LED connected from digital pin 9 to ground created 29 Dec. 2008 modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. ...
模拟输入引脚带有ADC功能(ADC:Analog-to-Digital Converter 模数转换)。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,从而实现读取模拟值的功能。 使用AVR芯片的Arduino模拟输入功能有10位精度,意味着05V电压会转换成01023的整数形式表示。
// read the analog / millivolts value for pin 2: int analogValue = analogRead(1); int analogVolts = analogReadMilliVolts(2); // print out the values you read: Serial.printf("ADC analog value = %d\n",analogValue); Serial.printf("ADC millivolts value = %d\n",analogVolts); ...
Arduino Analog Pins There are six pins on the Arduino Uno (shown below A0 ~ A5) that can be selected for an ADC measurement; A multiplexor feeds one of the six analogue input pins into the ADC. Use the function: analogRead(pin)