I made this project for my teacher who has a problem like this. So I made this code and it crossed my mind to publish it to github.
- Arduino (Uno, Mega, Pro mini, Nano)
- LCD (Im using I2C)
- Relay (For turn on solenoid)
- Power Supply (I'm using 5V)
- Buzzer Active
- Flow Sensor
- Box (Optional)
- Button (Optional if you using box) for reset button
Connection
- VCC => 5V
- GND => GND
Relay
- IN => 13
Flow Sensor
- DATA => 2
LCD I2C (I'm using Arduino Uno)
- SDA => A4
- SCL => A5
Button
# You can connect to RST pin to GND pin
And this is the shape of this tool
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x26, 16, 2);
byte statusLed = 12;
byte sensorInterrupt = 0; // 0 = digital pin 2
byte sensorPin = 2;
// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 13.75;
volatile byte pulseCount;
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;
unsigned long oldTime;
int liter;
const int volume = 40; //liter
const int relay = 13;
byte zero[] = {
B00000,
B00000,
B00000,
B00000,
B00000,
B00000,
B00000,
B00000
};
byte one[] = {
B10000,
B10000,
B10000,
B10000,
B10000,
B10000,
B10000,
B10000
};
byte two[] = {
B11000,
B11000,
B11000,
B11000,
B11000,
B11000,
B11000,
B11000
};
byte three[] = {
B11100,
B11100,
B11100,
B11100,
B11100,
B11100,
B11100,
B11100
};
byte four[] = {
B11110,
B11110,
B11110,
B11110,
B11110,
B11110,
B11110,
B11110
};
byte five[] = {
B11111,
B11111,
B11111,
B11111,
B11111,
B11111,
B11111,
B11111
};
void setup()
{
// Initialize a serial connection for reporting values to the host
Serial.begin(9600);
lcd.begin();
lcd.backlight();
lcd.createChar(0, zero);
lcd.createChar(1, one);
lcd.createChar(2, two);
lcd.createChar(3, three);
lcd.createChar(4, four);
lcd.createChar(5, five);
// Set up the status LED line as an outputa
pinMode(statusLed, OUTPUT);
pinMode(relay, OUTPUT);
digitalWrite(relay, HIGH);
digitalWrite(statusLed, HIGH); // We have an active-low LED attached
pinMode(sensorPin, INPUT);
digitalWrite(sensorPin, HIGH);
lcd.clear();
pulseCount = 0;
flowRate = 0.0;
flowMilliLitres = 0;
totalMilliLitres = 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()
{
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;
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("L/min");
Serial.print("\t"); // Print tab space
// Print the cumulative total of litres flowed since starting
Serial.print("Output Liquid Quantity: ");
Serial.print(totalMilliLitres);
Serial.println("mL");
Serial.print("\t"); // Print tab space
Serial.print(totalMilliLitres / 1000);
Serial.print("L");
lcd.setCursor(0, 0);
liter = totalMilliLitres / 1000;
lcd.print("L: ");
lcd.print(liter);
if (liter >= volume) {
digitalWrite(relay, LOW);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Proses Selesai");
} else {
digitalWrite(relay, HIGH);
updateProgressBar(liter, volume, 1);
}
// 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++;
}
void updateProgressBar(unsigned long count, unsigned long totalCount, int lineToPrintOn)
{
double factor = totalCount / 80.0; //See note above!
int percent = (count + 1) / factor;
int number = percent / 5;
int remainder = percent % 5;
if (number > 0)
{
lcd.setCursor(number - 1, lineToPrintOn);
lcd.write(5);
}
lcd.setCursor(number, lineToPrintOn);
lcd.write(remainder);
}
For the next, I would to upgrade the features for this project. Wait for the next repository update.