根据频率值计算风速-Java 学习之路

我有NRG＃40风速传感器，输出频率是线性的，风速输出信号范围从0 Hz到125 Hz 0 Hz均值= 0.35 m / s和125 Hz = 96 m / s，传递函数是m / s =（ Hz x 0.765）0.35如何将此传感器与Arduino mega连接以前我连接Adafruit（产品编号：1733），这是 output voltage 不是频率与风速呈线性关系，此代码为Adafruit：

//Setup Variables

const int sensorPin = A0; //Defines the pin that the anemometer output is connected to
int sensorValue = 0; //Variable stores the value direct from the analog pin
float sensorVoltage = 0; //Variable that stores the voltage (in Volts) from the anemometer being sent to the analog pin
float windSpeed = 0; // Wind speed in meters per second (m/s)

float voltageConversionConstant = .004882814; //This constant maps the value provided from the analog read function, which ranges from 0 to 1023, to actual voltage, which ranges from 0V to 5V
int sensorDelay = 1000; //Delay between sensor readings, measured in milliseconds (ms)

//Anemometer Technical Variables
//The following variables correspond to the anemometer sold by Adafruit, but could be modified to fit other anemometers.

float voltageMin = .4; // Mininum output voltage from anemometer in mV.
float windSpeedMin = 0; // Wind speed in meters/sec corresponding to minimum voltage

float voltageMax = 2.0; // Maximum output voltage from anemometer in mV.
float windSpeedMax = 32; // Wind speed in meters/sec corresponding to maximum voltage



void setup() 
{              
  Serial.begin(9600);  //Start the serial connection
}


void loop() 
{
sensorValue = analogRead(sensorPin); //Get a value between 0 and 1023 from the analog pin connected to the anemometer

sensorVoltage = sensorValue * voltageConversionConstant; //Convert sensor value to actual voltage

//Convert voltage value to wind speed using range of max and min voltages and wind speed for the anemometer
if (sensorVoltage &lt;= voltageMin){
 windSpeed = 0; //Check if voltage is below minimum value. If so, set wind speed to zero.
}else {
  windSpeed = (sensorVoltage - voltageMin)*windSpeedMax/(voltageMax - voltageMin); //For voltages above minimum value, use the linear relationship to calculate wind speed.
}

 //Print voltage and windspeed to serial
  Serial.print("Voltage: ");
  Serial.print(sensorVoltage);
  Serial.print("\t"); 
  Serial.print("Wind speed: ");
  Serial.println(windSpeed); 

 delay(sensorDelay);
}

1 回答

1
假设您使用Arduino UNO或Nano，一种简单的方法是将传感器连接到引脚D2或D3，可以用作中断引脚 . 然后，您可以创建一个函数或ISR，每次传感器发出脉冲时都会调用它 . 然后将新创建的函数附加到中断引脚 . 所以它看起来像这样 .
```
byte sensorPin = 2;
double pulses = 0;
double wSpeed = 0;
long updateTimer = 0;
int updateDuration = 3000;

void setup() {
  Serial.begin(115200);
  pinMode(sensorPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(sensorPin), sensorISR, FALLING);
}

void loop() {
  long now = millis();
  if(updateTimer < now) {
    updateTimer = now + updateDuration;
    wSpeed = ((pulses/(updateDuration/1000)) * 0.765) + 0.35;
    pulses = 0;
    Serial.println("Windspeed is:" + String(wSpeed));
  }
}

void sensorISR() {
  pulses++;
}
```
ISR功能的唯一作用是增加每个脉冲的脉冲变量 . 然后你可以每秒计算出频率和速度 . 如果您等待3秒而不是像上面那样，您将获得更好的分辨率，但必须考虑等式中的额外时间 .

我没有测试这段代码 .
回复于 2024-04-27T07:11:01+08:00

根据频率值计算风速

1 回答

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