YF-S201 Water Flow Sensor and Arduino | Sheekar Banerjee

1//Coded and Tested By:
2// Sheekar Banerjee, AI-ML-IOT Solution Engineer  and Researcher
3
4/*
5Arduino Water flow meter
6YF- S201 Hall Effect Water  Flow Sensor
7Water Flow Sensor output processed to read in litres/hour
8*/
9volatile  int flow_frequency; // Measures flow sensor pulses
10unsigned int l_hour; // Calculated  litres/hour
11unsigned char flowsensor = 2; // Sensor Input
12unsigned long currentTime;
13unsigned  long cloopTime;
14void flow () // Interrupt function
15{
16flow_frequency++;
17}
18void  setup()
19{
20pinMode(flowsensor, INPUT);
21digitalWrite(flowsensor, HIGH); //  Optional Internal Pull-Up
22Serial.begin(9600);
23attachInterrupt(0, flow, RISING);  // Setup Interrupt
24 sei(); // Enable interrupts
25currentTime = millis();
26cloopTime  = currentTime;
27}
28void loop ()
29{
30currentTime = millis();
31 // Every  second, calculate and print litres/hour
32if(currentTime >= (cloopTime + 1000))
33{
34  cloopTime = currentTime; // Updates cloopTime
35
36 // Pulse frequency (Hz) =  7.5Q, Q is flow rate in L/min.
37 l_hour = (flow_frequency * 60 / 7.5);
38 //  (Pulse frequency x 60 min) / 7.5Q = flowrate in L/hour
39
40 flow_frequency =  0; // Reset Counter
41 Serial.print(l_hour, DEC); // Print litres/hour
42 Serial.println("  L/hour");
43}
44}