ขอคำแนะนำด้วยครับ water flow

ผมจะเครื่องฉีดน้ำ ตั้งแต่ 50 ml - 400 ml ต่อครั้ง

ปัญหาคือ เมื่อตั้งค่าที่ 60 ml แล้วปล่อยน้ำ พบว่า LCD แสดงค่าเกินกว่าที่กำหนด และน้ำที่ก็ออกมาเกิน หลังจาก

Relay ตัดไฟ พอจะแก้ได้หรือปล่าวครับ

 

ใช้ Arduino Uno R3

    water flow sensor : YF-S20,1-30 L/min,Pressure<=1.75 Mpa

    Relay : บอร์ด Relay 2 ช่อง 5 โวลต์ 10A 250V สำหรับ Arduino และ Microcontroller

โคดที่ใช้

#include <Wire.h>

#include <LiquidCrystal.h>

/*******************************************************

This program will test the LCD panel and the buttons

Mark Bramwell, July 2010

********************************************************/

// select the pins used on the LCD panel

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

// define some values used by the panel and buttons

int lcd_key     = 0;

int adc_key_in  = 0;

#define btnRIGHT  0

#define btnUP     1

#define btnDOWN   2

#define btnLEFT   3

#define btnSELECT 4

#define btnNONE   5

byte prev_screen;

byte prev_lcd_key;

byte sensorInterrupt = 0;  // 0 = pin 2; 1 = pin 3

byte sensorPin       = 2;

byte relayPin        = 3;

float calibrationFactor = 4.5;

float flowRate = 0;

volatile byte pulseCount = 0;

unsigned long flowMilliLitres = 0;

unsigned long totalMilliLitresA = 0;

byte screen = 0;

int set_point = 0;

byte edit = 0;

unsigned long oldTime = 0;

byte key_input;

byte statusLed    = 13;

 

int total_litres = 0;

byte display_run = 0;

 

// read the buttons

int read_LCD_buttons()

{

  adc_key_in = analogRead(0);      // read the value from the sensor

  if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result

  if (adc_key_in < 50)   return btnRIGHT;

  if (adc_key_in < 195)  return btnUP;

  if (adc_key_in < 380)  return btnDOWN;

  if (adc_key_in < 555)  return btnLEFT;

  if (adc_key_in < 790)  return btnSELECT;

 

  return btnNONE;  // when all others fail, return this...

}

void setup()

{

  lcd.begin(16, 2);              // start the library

  lcd.clear();

  lcd.setCursor(0, 0);

  Serial.begin (9600);

  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

}

void loop()

{

  pinMode(statusLed, OUTPUT);

  pinMode(relayPin, OUTPUT);

  lcd_key = read_LCD_buttons();  // read the buttons

 

  if (prev_lcd_key != lcd_key) {

 

    switch (lcd_key)  // depending on which button was pushed, we perform an action

    {

      case btnRIGHT:

        {

          key_input = 2;

          break;

        }

      case btnLEFT:

        {

          key_input = 1;

          break;

        }

      case btnUP:

        {

          if (edit == 1)

          {

            set_point++;

          }

          break;

        }

      case btnDOWN:

        {

          if (edit == 1)

          {

            set_point--;

          }

          break;

        }

      case btnSELECT:

        {

          if (screen == 1) {

            screen = 0;

            edit = 0;

          }

          else

          { screen = 1;

            edit = 1;

          }

          break;

        }

      case btnNONE:

        {

          key_input=0;

          break;

        }

    }

  }

  prev_lcd_key = lcd_key;

 

  if (set_point < 60){set_point = 60;

  }

  if (set_point >400){set_point =400;

  }

 

  if (key_input == 1) {

    totalMilliLitresA = 0;

    total_litres = 0;

    display_run = 1;

    digitalWrite(statusLed, HIGH);

    digitalWrite(relayPin, LOW);

  }

 

  if (key_input == 2) {

    display_run = 0;

    digitalWrite(statusLed, LOW);

    digitalWrite(relayPin, HIGH);

  }

  

  if (total_litres >= set_point) {

    display_run = 0;

    digitalWrite(statusLed, LOW);

    digitalWrite(relayPin, HIGH);

  }

 

  if ((millis() - oldTime) > 1000)   // Only process counters once per second

  {

 

    detachInterrupt(sensorInterrupt);

    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

    oldTime = millis();

    // convert to millilitres.

    flowMilliLitres = (flowRate / 60) * 1000;

 

    totalMilliLitresA += flowMilliLitres;

 

    if (display_run == 1) {

      total_litres = totalMilliLitresA;

    }

    pulseCount = 0;

    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

  }

  

  Serial.print ("display: ");

  Serial.print (display_run);

  Serial.print (" ml: ");

  Serial.print (totalMilliLitresA);

  Serial.print (" mL ");

  Serial.print (total_litres);

  Serial.print (" setpoint ");

  Serial.println (set_point);

  

  if (prev_screen != screen) {

    lcd.clear();

  }

 

  lcd.setCursor(0, 0);

  switch (screen) {

    case 0:

      lcd.setCursor(0, 0);

      lcd.print("Flow:");

      if (flowRate < 10){

        lcd.print(" ");}

      lcd.print(flowRate, 2);

      lcd.setCursor(11, 0);

      lcd.print(total_litres);

      lcd.print("mL");

      lcd.setCursor(6, 1);

      lcd.print(set_point);

      lcd.print("mL");

      break;

 

    case 1:

      lcd.setCursor(0, 0);

      lcd.print("select to set");

      lcd.setCursor(0, 1);

      lcd.print(set_point  );

      lcd.print("mL");

      break;

  }

  prev_screen = screen;

}

 

void pulseCounter()

{

  // Increment the pulse counter

  pulseCount++;

}