Hi i use this code, and this code working, but i have flow in range 1 - 2 L/min, and in this range i need better precision for flowrate, now flowrate metter show me only 1; 1,2 ; 1,4 ; 1,6 ; 1,8 ; 2 L/min this only 0,2l/min precission, but i need precission 0,05 L/min. Any idea for this code.
Code
/*
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.
*/
#define CAYENNE_PRINT Serial
#include <CayenneMQTTESP8266.h>
#define VIRTUAL_PIN0 V0
#define VIRTUAL_PIN3 V1
#define VIRTUAL_PIN3 V2
// Your network name and password.
char ssid[] = “AndroidAP”;
char wifiPassword[] = “bamboocha”;
char username[] = “24215630-28e0-11e8-aeac-8375e928efd4”;
char password[] = “310d584371f324cfb82be6259716213c89d3fc76”;
char clientID[] = “2ee1b790-28e0-11e8-b6d4-35a0ad51f849”;
byte statusLed = 13;
byte sensorInterrupt = 0; // 0 = digital pin 2
byte sensorPin = 0;
// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 5;
volatile byte pulseCount;
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;
unsigned long totalLitres;
unsigned long oldTime;
void setup()
{
// Initialize a serial connection for reporting values to the host
Serial.begin(9600);
Cayenne.begin(username, password, clientID, ssid, wifiPassword);
// 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;
totalLitres = 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()
{
Cayenne.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;
totalLitres = totalMilliLitres / 1000;
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(”.”); // Print the decimal point
// Determine the fractional part. The 10 multiplier gives us 1 decimal place.
frac = (flowRate - int(flowRate)) * 10;
Serial.print(frac, DEC) ; // Print the fractional part of the variable
Serial.print(“L/min”);
// Print the number of litres flowed in this second
Serial.print(" Current Liquid Flowing: "); // Output separator
Serial.print(flowMilliLitres);
Serial.print(“mL/Sec”);
// Print the cumulative total of litres flowed since starting
Serial.print(" Output Liquid Quantity: "); // Output separator
Serial.print(totalLitres);
Serial.println(“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()
{
// Increment the pulse counter
pulseCount++;
}
CAYENNE_OUT(V0) //Flow rate:
{
Cayenne.virtualWrite(V0, flowRate);
}
CAYENNE_OUT(V1) //Current Liquid Flowing:
{
Cayenne.virtualWrite(V1, flowMilliLitres);
}
CAYENNE_OUT(V2) //Output Liquid Quantity:
{
Cayenne.virtualWrite(V2, totalLitres);
}
