Question

我有NRG＃40风速传感器输出频率与风速呈线性关系输出信号范围为0 Hz至125 Hz 0 Hz均值= 0.35 m / s，125 Hz = 96 m / s，传递函数为 m / s =（Hz×0.765）+ 0.35 如何使用Arduino mega连接此传感器以前我连接Adafruit（产品编号：1733）输出电压不频率与风速呈线性关系和Adafruit的代码：

 //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);
}

Answer 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。

<Button x:Name="reportPathSelectBtn" Grid.Row="1" Grid.Column="1" Margin="10,0,0,0" MinWidth="70" Width="Auto" Height="23" VerticalAlignment="Bottom"
                                   Click="BtnSelectPath_Click" Background="#e3e3e3" Style="{StaticResource FolderOpenBtn}"/>

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。

根据频率值计算风速

1 个答案: