Syringe Pump

#include <AccelStepper.h>

#include <LiquidCrystal.h>

AccelStepper stepper(AccelStepper::DRIVER, 8, 9);

float sensorValue = 0;

float flowRateMstPerS = 0;

int timeLeft = 0;

int secToEmpty;

int start_button = 12;

int red_LED_pin = A3;

int blue_LED_pin = A1;

int green_LED_pin = A2;

int end_switch = 7;

float fs = 0;

float minFlow = -.9;

float maxFlow = .9;

float mL20syringe = 0.000632911;

float mL5syringe = 0.00025;

float mL20syringeA = 287.4;

float mL5syringeA = 114.04;

float area;

float mLperms;//

int timepassed = 0;  // increments milliseconds spent running motor

int t1;

int t2;

float syringe20Len = 79;

float syringe5Len = 50;

float syringeLen;

float syringe = true; //true of 20mL syringe make false if 5mL inserted

LiquidCrystal lcd(11, 6, 5, 4, 3, 2);

void setup(){

  if (syringe == true) {

    mLperms = mL20syringe;

    syringeLen = syringe20Len;

    area = mL20syringeA;

  } else {

    mLperms = mL5syringe;

    syringeLen = syringe5Len;

    area = mL5syringeA;

  }

  analogWrite(10, 100); 

// Generate PWM signal at pin D10, value of 100 (out of 255){

  Serial.begin(9600);

  pinMode(red_LED_pin, OUTPUT);

  pinMode(blue_LED_pin, OUTPUT);

  pinMode(green_LED_pin, OUTPUT);

  pinMode(start_button, INPUT_PULLUP);

  pinMode(end_switch, INPUT_PULLUP);

  pinMode(A0, INPUT);

  // set up the LCD's number of columns and rows:

  lcd.begin(16, 2);

  delay(2000);

  stepper.setMaxSpeed(1000);

  stepper.setAcceleration(500); //set acceleration rate (steps/s^2)

  stepper.setSpeed(0);

}

float fmap(float x, float in_min, float in_max, float out_min, float out_max){ 

return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;

}

void loop() {

  secToEmpty = syringeLen * (3200 / 8) * (1 / flowRateMstPerS );

  t1 = millis(); // initialize start time for timeleft calculation

  if ((digitalRead(end_switch) == LOW) && ((digitalRead(start_button) == LOW))) {

    analogWrite(red_LED_pin, 0);

    analogWrite(green_LED_pin, 255);

    analogWrite(blue_LED_pin, 0);

    //check potentiometer

    sensorValue = analogRead(A0);

    //convert from mL/min to steps/second

    fs = fmap(sensorValue, 0.00, 1023.00, minFlow, maxFlow); 

    // fs = ml per min

    flowRateMstPerS = (fs / 60) / mLperms*1600; 

    // flowRateMstPerS = microsteps per second

    flowRateMstPerS = fs / 60 * 1000 / area * 3200 / 8; 

    // flowRateMstPerS = microsteps per second

    //set the motor speed and run motor

    stepper.setSpeed(-flowRateMstPerS);

    stepper.runSpeed();

    t2 = millis();

    timepassed += (t2 - t1);

    timeLeft = secToEmpty - (timepassed / 1000);

    // update speed and timeleft every 1/18th of a rotation.

    if ((stepper.currentPosition() % 20) == 0) {

      Serial.print("flow rate: ");

      Serial.println(fs);

      lcd.clear();

      lcd.setCursor(0, 0);

      lcd.print("Flow Rate: ");

      lcd.setCursor(4, 0);

      lcd.print(fs);

      lcd.setCursor(0, 1);

      lcd.print("Time Left: ");

      lcd.setCursor(4, 1);

      lcd.print(timeLeft);

    }

  } else {

    t1 = millis(); 

    if (digitalRead(end_switch) == HIGH) {

      analogWrite(red_LED_pin, 255);

      analogWrite(green_LED_pin, 0);

      analogWrite(blue_LED_pin, 0);

      sensorValue = analogRead(A0);

      //convert from mL/min to steps/second

      fs = fmap(sensorValue, 0.00, 1023.00, minFlow, maxFlow); 

      // fs = ml per min

      //flowRateMstPerS = (fs / 60) / mLperms*1600; 

      // flowRateMstPerS = microsteps per second

      flowRateMstPerS = fs / 60 * 1000 / area * 3200 / 8; 

      // flowRateMstPerS = microsteps per second

      if (flowRateMstPerS < 0) {

        //set the motor speed and run motor

        stepper.setSpeed(-flowRateMstPerS);

        stepper.runSpeed();

      }

    } else {

      analogWrite(red_LED_pin, 0);

      analogWrite(green_LED_pin, 0);

      analogWrite(blue_LED_pin, 255);

    }

    if ((millis() % 1000) == 0) {

      lcd.print("Flow Rate: ");

      lcd.setCursor(4, 0);

      lcd.print("0");

      lcd.setCursor(0, 1);

      lcd.print("Time Left: ");

      lcd.setCursor(4, 1);

      lcd.print(timeLeft);

    }

  }

}