Tinkers Projects

Code for Project

#include <LiquidCrystal.h>
#include <EEPROM.h>

#define maxPressure 100
#define sensorMultiplier 0.3
#define sensorOffSet -30
#define outputPin A1
#define sensorPin A5
#define upButtonPin 3
#define downButtonPin 10

double sensorValue;
double pressure;
byte setPressure = 0;
unsigned long timeLastSet = 0;
unsigned long timeLastOn = 0;
bool timeout = false;

LiquidCrystal lcd(2, 4, 5, 6, 7, 8);

void setup() 
{
  lcd.begin(16, 2);
  Serial.begin(9600);
  Load();
  changed();
  pinMode(outputPin,OUTPUT);
  pinMode(sensorPin,INPUT);
  pinMode(upButtonPin,INPUT);
  pinMode(downButtonPin,INPUT);
}

void loop() 
{
  readSensor();
  control();
  Set();
  displayreading();
}

#define samplecount 20
int samples[samplecount];

void readSensor()
{
  int indexI = (millis()/(1000/samplecount))%(samplecount);
  samples[indexI] = analogRead(sensorPin);

  for(int i = 0; i<samplecount;i++)
  {
    sensorValue += samples[i];

  }
  sensorValue = sensorValue/samplecount;
  pressure = sensorMultiplier*sensorValue+sensorOffSet;
}

void control()
{
  if(timeLastOn+120000 < millis())
  {
    timeout=false;
  }
  
  if(pressure < setPressure*0.2)
  {
    timeLastOn = millis();
    digitalWrite(outputPin,HIGH);
    timeout=false;
  }
  else if(pressure > setPressure || timeout)
  {
    digitalWrite(outputPin,LOW);
    timeout=true;
  }
  else if(pressure < setPressure*0.6)
  {
    timeLastOn = millis();
    digitalWrite(outputPin,HIGH);
  }
}

void displayreading()
{
  lcd.setCursor(0,0);
  lcd.print((int)pressure);
  lcd.print(" PSI        ");
  lcd.setCursor(0,1);
  lcd.print("set: ");
  lcd.print(setPressure);
  lcd.print(" PSI        ");
}

void Set()
{
  if(timeLastSet+500>millis())
    return;
  if(digitalRead(downButtonPin) == HIGH)
  {
    setPressure -= maxPressure*0.05;
    changed();
  }
  if(digitalRead(upButtonPin) == HIGH)
  {
    setPressure += maxPressure*0.05;
    changed();
  }
}

void changed()
{
  timeLastSet = millis();
  if(setPressure >= maxPressure)
    setPressure = maxPressure;
  if(setPressure <= 0)
    setPressure = 0;
  Save();
}

int address = 0;

void Save()
{
  EEPROM.write(address, setPressure);
}

void Load()
{
  setPressure = EEPROM.read(address);
}