YF-S201水流量传感器控制燃气热水器（附Arduino代码） -

EFFECT HALL FLOWMETER
TECHNICAL DETAILS
Electrical:
Working Voltage: 5 to 18VDC
Max current draw: 15mA @ 5V
Working Flow Rate: 1 to 30 Liters/Minute
Working Temperature range: -25 to 80°C
Working Humidity Range: 35%-80% RH
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:
Flow rate: 1 pulse/s = 7.5 L/min
Acumulated volume: 1 Liter = 450 pulses
maximum pulse frequency: 30 L/min-> 225 imp/s -> min period 4.44 ms (delta 0.1 L/min->0.015 ms)
5 L/min-> 37.5 imp/s-> period 26.66 ms (delta 0.1 L/min->0.523 ms)
minimun pulse frequency: 1 L/min-> 7.5 imp/s -> max period 133.3 ms (delta 0.1 L/min->12.1 ms)
Durability: minimum 300,000 cycles
Mechanical:
1/2" NPS nominal pipe connections, 0.78" outer diameter, 1/2" of thread
Size: 2.5" x 1.4" x 1.4"
v02 Add LCD display
The circuit:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 10
* LCD D5 pin to digital pin 9
* LCD D6 pin to digital pin 8
* LCD D7 pin to digital pin 7
* LCD R/W pin to ground
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
*/
#include "PulseSensor.h"
#include <LiquidCrystal.h>
//#define PulseGen A0 //Pulse generate 5KHz, A0
#define LED13 13
#define REFRESH_INTERVAL 1000 // refresh time, 1 second
#define WRITE_INTERVAL 2000 // values send to serial port, 2 seconds (2 * 1000)
#define PULSE_PIN 2 // see external interrupt pins available on your Arduino.
#define HotSwitch 4 // control the heater switch on/off
#define PULSES_2_LITERS 450 // coefficient conversion from pulses to liters
#define PULSES_SEC_2_LITERS_MINUTE 7.5 // (450/60) coefficient conversion pulses/second from to liters/minute
PulseSensor flowmeter; // instance to collect data
//variables to process and send values
//int RA0flag = 0;
//int fireNumber = 0;
float flowRate;
float maxRate;
float minRate;
float acumFlow;
float lastAcumFlow;
boolean firstData;
boolean Fireflag;
//unsigned long previousMillis = 0;
//unsigned long currentMillis = 0;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
/*
ISR(TIMER1_OVF_vect)
{
TCNT1 = 0X85ED; // time 2s, 1s = 0XC2F6;
RA0flag = 1; // - RA0flag;
}
*/
void setup()
{
/*
cli(); //Turn off global interrupt
TCCR1A = 0; //Register A is configured with PWM. Here we only use the timing function. In fact, it does not need to be configured
TCCR1B = (1 << CS12) | (1 << CS10); //Register B is used to configure the timing function. Now it is configured with 1024 frequency division
TCNT1 = 0X85ED; //The initial value of the counter，time 2s, 1s = 0XC2F6; TCNT1= 0XFFFF - 1 / (1024 *（1/16000000）)= 0xFFFF –0x3D09=0XC2F6
TIMSK1 = (1 << TOIE1); //Overflow interrupt enable
sei(); //Turn on global interrupt
*/
pinMode(HotSwitch, OUTPUT);
pinMode(LED13, OUTPUT);
lcd.begin(16, 2);
lcd.print("Flowrate = ");
lcd.setCursor(0, 1);
lcd.print("litre/second");
//Serial.begin(9600);
//delay(1000);
flowmeter.begin(PULSE_PIN, REFRESH_INTERVAL, PULSES_SEC_2_LITERS_MINUTE, PULSES_2_LITERS);
//Serial.println("time(s), average flowrate(l/min), max rate, min rate, volume(liters)");
//Serial.println("Realtime flowrate(litre/second)");
firstData = false;
Fireflag = false;
flowRate = 0;
maxRate = 0;
minRate = 0;
acumFlow = 0;
digitalWrite(LED13, LOW);
//tone(PulseGen, 5000);
}
void loop()
{
//sei();
if (flowmeter.available())
{
flowRate = flowmeter.read();
//Serial.println(flowRate);
//lcd.setCursor(0, 1); //Setup LCD display
//lcd.print(flowRate); //Display flowRate value
/*
if (!firstData) {
if (maxRate < flowRate) maxRate = flowRate;
if (minRate > flowRate) minRate = flowRate;
}
else {
maxRate = flowRate;
minRate = flowRate;
firstData = false;
}
*/
if (!Fireflag) //Wait for flow enable
{
if (flowRate > 2.00)
{
digitalWrite(HotSwitch, HIGH);
Fireflag = true;
lcd.setCursor(0, 1); //Setup LCD display
lcd.print(flowRate); //Display flowRate value
}
//if (flowmeter.available())
//{
//flowRate = flowmeter.read();
//}
}
}
if (Fireflag) //Wait for flow disable
{
/*
currentMillis = millis();
if (currentMillis - previousMillis >= WRITE_INTERVAL) {
if (RA0flag)
{
previousMillis = currentMillis;
RA0flag = 0;
acumFlow = flowmeter.readAcum();
//flowRate = (acumFlow - lastAcumFlow) * 60 * 1000 / WRITE_INTERVAL; //average flowrate
lastAcumFlow = acumFlow;
firstData = true;
*/
//Serial.print(currentMillis / 1000);
//Serial.print(",");
/*
Serial.print(flowRate);
Serial.print(",");
Serial.print(maxRate);
Serial.print(",");
Serial.print(minRate);
Serial.print(",");
Serial.println(acumFlow);
*/
if (flowRate <= 0.00)
{
digitalWrite(HotSwitch, LOW);
Fireflag = false;
}
/*
if (acumFlow > 9000000.00) //9E+6, Floating-point numbers can be as large as 3.4028235E+38 and as low as -3.4028235E+38.
{
flowmeter.resetAcum();
}
*/
//}
}
}

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