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#include <SPI.h> //För OLED
#include <Wire.h> //vene..
#include <Adafruit_SSD1306.h> //För OLED
Adafruit_SSD1306 display(128, 64, &Wire, 4); //Width, height, vene, RST-pin (anv. ej på disp, men låt stå
// this constant won't change:
const int buttonPin = 27;  // the pin that the pushbutton is attached to


// Variables will change:
int buttonPushCounter = 0;  // counter for the number of button presses
int buttonState = 0;        // current state of the button
int lastButtonState = 0;    // previous state of the button

int Htime;              //integer for storing high time
int Ltime;                //integer for storing low time
float Ttime;            // integer for storing total time of a cycle
float frequency;        //storing frequency
float lph;            //Flow Rate (Litres/hour) = (Pulse frequency x 60 min) / 7.5Q
float lpm;
float lps;

void setup() {

    display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //starta OLED, adress 0x3C
  display.display();  delay(1000);
  // initialize the button pin as a input:
  pinMode(buttonPin, INPUT);
  // initialize the LED as an output:
  Serial.begin(19200);

    display.clearDisplay();
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);            // Start at top-left corner
    display.setTextSize(2);
     display.display();

}


void loop() {
    
    Htime=pulseIn(buttonPin,HIGH);      //read high time
    Ltime=pulseIn(buttonPin,LOW);        //read low time
    Ttime = Htime+Ltime;
    frequency=1000000/Ttime;    //getting frequency with Ttime is in Micro seconds
    
    lpm = frequency / 6.6;
    lph = lpm * 60;
    lps = lpm / 60;
display.clearDisplay();
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);            // Start at top-left corner
    display.setTextSize(2);
    display.println(lps);
    display.println(lpm);
    display.println(lph);
    display.display();

delay(500);

}