YF-S201 Hall Effect Water Flow Meter Sensor วัดอัตราการไหลของน้ำ ขนาดท่อ 1/2”

Features:

• Model: YF-S201
• Sensor Type: Hall effect
• Working Voltage: 5 to 18V DC (min tested working voltage 4.5V)
• Max current draw: 15mA @ 5V
• Output Type: 5V TTL
• Working Flow Rate: 1 to 30 Liters/Minute
• Working Temperature range: -25 to +80℃
• Working Humidity Range: 35%-80% RH
• Accuracy: ±10%
• Maximum water pressure: 2.0 MPa
• Output duty cycle: 50% +-10%
• Output rise time: 0.04us
• Output fall time: 0.18us
• Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min)
• Pulses per Liter: 450
• Durability: minimum 300,000 cycles
• Cable length: 15cm
• 1/2" nominal pipe connections, 0.78" outer diameter, 1/2" of thread
• Size: 2.5" x 1.4" x 1.4"

Connection details:

• Red wire : +5V
• Black wire : GND
• Yellow wire : PWM output.

วงจรทดสอบ:

• Pulse frequency (Hz) = 7.5Q, Q is flow rate in Litres/minute
• Flow Rate (Litres/hour) = (Pulse frequency x 60 min) / 7.5Q

In other words:

• Sensor Frequency (Hz) = 7.5 * Q (Liters/min)
• Litres = Q * time elapsed (seconds) / 60 (seconds/minute)
• Litres = (Frequency (Pulses/second) / 7.5) * time elapsed (seconds) / 60
• Litres = Pulses / (7.5 * 60)

/*
YF‐ S201 Water Flow Sensor
Water Flow Sensor output processed to read in litres/hour
Adaptation Courtesy: www.hobbytronics.co.uk
*/
volatile int flow_frequency; // Measures flow sensor pulses
unsigned int l_hour; // Calculated litres/hour
unsigned char flowsensor = 2; // Sensor Input
unsigned long currentTime;
unsigned long cloopTime;
 void flow () // Interrupt function
 {
flow_frequency++;
 }
void setup()
{
pinMode(flowsensor, INPUT);
digitalWrite(flowsensor, HIGH); // Optional Internal Pull-Up
 Serial.begin(9600);
attachInterrupt(0, flow, RISING); // Setup Interrupt
sei(); // Enable interrupts
currentTime = millis();
cloopTime = currentTime;
}

void loop ()
 {
currentTime = millis();
 // Every second, calculate and print litres/hour
 if(currentTime >= (cloopTime + 1000))
 {
cloopTime = currentTime; // Updates cloopTime
 // Pulse frequency (Hz) = 7.5Q, Q is flow rate in L/min.
l_hour = (flow_frequency * 60 / 7.5); // (Pulse frequency x 60 min) / 7.5Q = flowrate in L/hour
flow_frequency = 0;  // Reset Counter
Serial.print(l_hour, DEC); // Print litres/hour
Serial.println(" L/hour");
}
}