使用Arduino简单的数字水流量计电路

在此帖子中，我们将使用Arduino和16 x 2 LCD显示器构建数字水流量计。我们将看看YF-S201水流传感器，其施工和工作以及如何与Arduino接口以提取一些有用的读数。

The proposed project can measure the rate of water flow in litre / minute and total water flow in litres.

Let’s take a look at YF-S201 water flow sensor.

YF-S201的插图：

YF-S201 is a霍尔效应基于water sensor. It has three terminals 5V (nominal working voltage), GND and output. The +5V is red coloured wire, the black one is GND and yellow one is output.

传感器给出了与水流成正比的频率。YF-S201传感器可以从1升/分钟到30升/分钟测量。水压应小于或等于1.75MPa。

The water can be injected from one end and water flows through the other end.

The sensor may be placed after the main gate-valve of tank; if you want to measure the water flow in a network of water pipes or you can place just before a water tap to measure the water flow of single tap.

The placement of the sensor can be anywhere according to user’s need but, care must be taken to avoid leakage of water.

The sensor has a磁铁和霍尔效应传感器; if we take a look at the sides of the water flow sensor, we can witness a plastic turbine in the path of water flow.

A round shaped magnet is embedded at the center of the turbine and the Hall Effect sensor is sealed and protected from moisture and placed above the magnet. The Hall Effect sensor produces a pulse for every revolution of the turbine.

Water Flow Waveform on Serial Plotter

We can see the pulses generated by water flow sensor on serial plotter of arduino IDE, shown below (Using Arduino Single channel Oscilloscope).

We have blown air through the sensor to旋转涡轮机as a test and the waveform generated is shown above. The denser waveform on left hand side represents higher frequency and faster rotation of turbine, the less dense waveform at right hand side signifies the vice versa.

一致的水流赋予了一致的频率输出。

We have toconvert the frequencyinto litre/minute scale. To do this, the manufacturer has given a formula:

水的流量(升/min) = frequency / 7.5

So, we need to measure the generated frequency and apply the above formula in the program code.

YF-S201的技术规格：

·准确度：+/- 10％，如果您需要更好的精度，我们需要校准。

·工作温度：-25至+ 80摄氏度。

· Working humidity: 35% to 80% RH.

·产量占空比：50％+/- 10％。

·最大水压：1.75 MPa。

· Pulses per Litre: 450.

·最大电流拉布：5V的15 mA

总结了YF-S201水流传感器。

Now let’s move to the schematic.

Schematic Diagram:

水流量传感器的输出引脚连接到Arduino的A0。使用10K电位器for adjusting display contrast. Wire the Arduino andLCD display根据上图。

Program Code:

//-----Program Developed by R.Girish-----//
#include
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
X;
int y;
浮动时间= 0;
浮动频率= 0;
float waterFlow = 0;
float total = 0;
float ls = 0;
const int输入= a0;
const int测试= 9;
void setup（）
{
Serial.begin(9600);
LCD.BEGIN（16,2）;
lcd.clear（）;
lcd.setCursor(0,0);
lcd.print("Water Flow Meter");
lcd.setCursor（0,1）;
lcd.print("****************");
delay(2000);
pinMode(input,INPUT);
Pinmode（测试，输出）;
analogWrite(test,100);
}
void loop()
{
X = pulseIn(input, HIGH);
Y = pulseIn(input, LOW);
时间= x + y;
频率= 1000000 /时间;
waterFlow = frequency/7.5;
LS =水流/ 60;
if（频率> = 0）
{
if(isinf(frequency))
{
lcd.clear（）;
lcd.setCursor(0,0);
lcd.print("L/Min: 0.00");
lcd.setCursor（0,1）;
lcd.print（“总：”）;
lcd.print（总计）;
lcd.print（“L”）;
}
else
{
总=总+ ls;
Serial.println(frequency);
lcd.clear（）;
lcd.setCursor(0,0);
lcd.print（“l / min：”）;
lcd.print(waterFlow);
lcd.setCursor（0,1）;
lcd.print（“总：”）;
lcd.print（总计）;
lcd.print（“L”）;
}
}
延迟（1000）;
}
//-----Program Developed by R.Girish-----//

作者的原型：

“L / MIN”表示当前的水流量，“总”表示自电路导通以来流动的总水。

您还可以流动任何粘度值靠近水的液体。

如果您对使用Arduino有关此数字水流量计的任何疑问，请随时在评论部分中表达，您可以获得快速回复。