PRJ - Analog Read Serial

From: Analog Read Serial —— Arduino Documentation | built-in examples

电路连接

Code List

/*
  AnalogReadSerial

  Reads an analog input on pin 0, prints the result to the Serial Monitor.
  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/AnalogReadSerial
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  
  // print out the value you read:
  Serial.println(sensorValue);

   sensorValue = analogRead(A1);
   Serial.println(sensorValue);
  delay(1000);        // delay in between reads for stability
}

模拟引脚命名以 A 开头

模拟读的结果不一定得是小数，也可以是放大后的整数，这是更常用的做法

A0 读数的范围是多少呢？

转换成电压

前面的读数为整数，可进一步转换成电压：

void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
+  float voltage = sensorValue * (5.0 / 1023.0);
  // print out the value you read:
  Serial.println(voltage);
}