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如何使用水流量传感器?

时间: 2019-12-19 点击:
在本教程中,您将学习如何在Arduino板上使用一个水流传感器。
水流传感器由一个塑料阀体,一个水转子和一个霍尔效应传感器组成。当水流过转子时,转子会滚动,其速度会以不同的流速变化。霍尔效应传感器输出相应的脉冲信号。
可以在不同的直径,水压(MPa)和流速(L / m)范围内找到这种类型的传感器。确保选择一种可以满足您需求的产品。我拥有的传感器直径为20mm,水压<1.75Mpa,流量范围约为30 L / m。
在本教程中,我们将使用串行监视器打印以升/小时为单位的水流速以及自开始以来的总升水量。
因此,让我们开始吧!
步骤1:您需要什么
对于本教程,您将需要:
Arduino Uno
水流量传感器
3条面包板电缆
步骤2:电路
连接非常简单,请参见上图和面包板电路原理图。
步骤3:代码
这是使用Codebender嵌入的代码!
/*
Liquid flow rate sensor -DIYhacking.com Arvind Sanjeev
 
Measure the liquid/water flow rate using this code. 
Connect Vcc and Gnd of sensor to arduino, and the 
signal line to arduino digital pin 2.
 
 */
 
byte statusLed    = 13;
 
byte sensorInterrupt = 0;  // 0 = digital pin 2
byte sensorPin       = 2;
 
// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 4.5;
 
volatile byte pulseCount;  
 
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;
 
unsigned long oldTime;
 
void setup()
{
  
  // Initialize a serial connection for reporting values to the host
  Serial.begin(9600);
   
  // Set up the status LED line as an output
  pinMode(statusLed, OUTPUT);
  digitalWrite(statusLed, HIGH);  // We have an active-low LED attached
  
  pinMode(sensorPin, INPUT);
  digitalWrite(sensorPin, HIGH);
 
  pulseCount        = 0;
  flowRate          = 0.0;
  flowMilliLitres   = 0;
  totalMilliLitres  = 0;
  oldTime           = 0;
 
  // The Hall-effect sensor is connected to pin 2 which uses interrupt 0.
  // Configured to trigger on a FALLING state change (transition from HIGH
  // state to LOW state)
  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
 
/**
 * Main program loop
 */
void loop()
{
   
   if((millis() - oldTime) > 1000)    // Only process counters once per second
  { 
    // Disable the interrupt while calculating flow rate and sending the value to
    // the host
    detachInterrupt(sensorInterrupt);
        
    // Because this loop may not complete in exactly 1 second intervals we calculate
    // the number of milliseconds that have passed since the last execution and use
    // that to scale the output. We also apply the calibrationFactor to scale the output
    // based on the number of pulses per second per units of measure (litres/minute in
    // this case) coming from the sensor.
    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
    
    // Note the time this processing pass was executed. Note that because we've
    // disabled interrupts the millis() function won't actually be incrementing right
    // at this point, but it will still return the value it was set to just before
    // interrupts went away.
    oldTime = millis();
    
    // Divide the flow rate in litres/minute by 60 to determine how many litres have
    // passed through the sensor in this 1 second interval, then multiply by 1000 to
    // convert to millilitres.
    flowMilliLitres = (flowRate / 60) * 1000;
    
    // Add the millilitres passed in this second to the cumulative total
    totalMilliLitres += flowMilliLitres;
      
    unsigned int frac;
    
    // Print the flow rate for this second in litres / minute
    Serial.print("Flow rate: ");
    Serial.print(int(flowRate));  // Print the integer part of the variable
    Serial.print("L/min");
    Serial.print("\t");   // Print tab space
 
    // Print the cumulative total of litres flowed since starting
    Serial.print("Output Liquid Quantity: ");        
    Serial.print(totalMilliLitres);
    Serial.println("mL"); 
    Serial.print("\t");   // Print tab space
Serial.print(totalMilliLitres/1000);
Serial.print("L");
    
 
    // Reset the pulse counter so we can start incrementing again
    pulseCount = 0;
    
    // Enable the interrupt again now that we've finished sending output
    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
  }
}
 
/*
Insterrupt Service Routine
 */
void pulseCounter()
尝试下载Codebender插件,然后单击“在Arduino上运行”按钮,以使用此草图对Arduino板进行编程。就是这样,您已经使用此草图对Arduino进行了编程!
您可以通过单击“编辑”按钮继续进行操作,然后开始对代码进行自己的修改。例如,您可以在第58行中更改“ 1000” ms延迟时间。
步骤4:串行监视器
按下面的连接按钮开始串行通信。
将传感器与水龙头连接,或直接吹水。
注意:传感器的背面用一个箭头显示正确的流量侧。

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