Arduino Water and Light Control for Plants

#include <AccelStepper.h>

// Define a stepper for lamp motor
// Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5; we just used 3 and 4 without extra declaration
AccelStepper stepper;

// lamp motor variables
int lightsensor = A0; //grünes Kabel

int lightvalue = 0;
int lightmin = 600;
int lightmax = 935;

int lightPos = 0;
int maxPos = 30000;
int minPos = 0;

int lightTimeRead = 0;

// in7, in8 Steuerung, in6 pwm
// water pump variables
int watersensor = A5; //blaues Kabel
int in7Pump = 7;
int in8Pump = 8;
int pwmPump = 6;

//important Parameters for pump
int waterSensorPower = 10; //

int dryness = 0;
int drysoil = 500;
int wetsoil = 30;

//pumplogic/timer variables
boolean pumpActive = false;
int actualTime = 0;
int pumpTime = 0;
long lastTime = 0;
int pumpTimeRead = 0;
int lastHumidityRead = 0;

void setup()
{
  // setup for stepper motor
  stepper.setMaxSpeed(2000);
  stepper.setAcceleration(60);

  // setup for water pump
  pinMode(in8Pump, OUTPUT);
  pinMode(in7Pump, OUTPUT);
  pinMode(pwmPump, OUTPUT);
  pinMode(waterSensorPower, OUTPUT);

  digitalWrite(in8Pump, HIGH);
  digitalWrite(in7Pump,LOW);
  digitalWrite(waterSensorPower, LOW);

  // for reading the actual sensor values
 Serial.begin(9200);
}

// moves light up
void lightUp() {
  stepper.move(500);
  stepper.run();
  if(lightTimeRead < actualTime) {
    lightTimeRead = actualTime;
    lightPos += 500;
    }
  }

// moves light down
void lightDown() {
  stepper.move(-500);
  stepper.run();
  if(lightTimeRead < actualTime) {
    lightTimeRead = actualTime;
    lightPos -= 500;
  }
}

// timer for light
void lightTimeCounter(int currentTime) {
  int delta = currentTime - lastTime;

  if(delta > 1000) {
    lastTime = currentTime;
    actualTime++;
    Serial.println(lightvalue);
    }
  }

// activates pump
void startPumping() {
    if(!pumpActive) {
      pumpTime = 5;
      pumpActive = true;
      analogWrite(pwmPump,255);
    }
  }

// stops pump
void stopPumping() {
  if(pumpActive && pumpTime <= 0) {
      analogWrite(pwmPump,0);
    }
  }

// before that pump is locked and humidity is not measured
void unlockPump() {
  if(pumpActive && pumpTime < -60)
    pumpActive = false;
  }

// timer for pump
void pumpTimeCounter() {
    if(pumpTimeRead < actualTime && pumpActive)  {
        pumpTimeRead = actualTime;
        pumpTime--;
      }
  }

// catch possible error because of an time overflow
void catchOverflow(int currentTime) {
  int delta = currentTime - lastTime;
  if(delta < 0) {
    lastTime = currentTime;
  }
}

void loop()

{
  lightvalue = analogRead(lightsensor);

  //moves the light up if to dark
   if(lightvalue < lightmin) {
    lightDown();
   }

   // moves the light down if to bright
   if (lightvalue > lightmax) {
    lightUp();
   }

   // light stops moving if light value is ok
   if(lightvalue > lightmin && lightvalue < lightmax){
    stepper.move(0);
    stepper.run();
   }

  // sets timelimit for light measurement
  lightTimeCounter(millis());

  // activates pump if soil is too dry
  int deltaHum = actualTime - lastHumidityRead;
  if(deltaHum > 10) {
    lastHumidityRead = actualTime;
    digitalWrite(waterSensorPower, HIGH);
    dryness = analogRead(watersensor);

    if(dryness > drysoil && dryness < 900) {
      startPumping();
    }
    // stops measurement
    digitalWrite(waterSensorPower, LOW);
  }

  // blocks pump for a while until soil has soaked water
  pumpTimeCounter();

  // stops the pump
  stopPumping();

  //humidity can be measured again
  unlockPump();
}