This piece of code has grown quite a bit.
It started with sorting out the interrupts and I received a ton of help from the community.
The I added all the rest and now everything is working.
I still need to calibrate it on a constant flow, so the volume etc calculations are doing rubbish.
It is so big and I have spent so long working on it, I keep on picking up little inefficiencies.
You might be able to spot something I'm doing that I could be doing better.
So I'm putting my neck on the stake here, go ahead and chop!
Any and all help/suggestions are appreciated.
Bashing and breaking is not. I'm human and I make mistakes, still learning 
Thanks!
1010
//Libraries
#include "U8glib.h" //LCD library
//LCD
U8GLIB_PCD8544 u8g(13, 11, 10, 9, 12); //SCK, MOSI, CS, A0, Reset - LCD pins
#define DISPLAY_RATE 5 // Number loops before the LCD updates the output
int intLCDdisplay = 0; //Counter for above
//variables
volatile long DirT; //time between A Falling and B Rising
volatile long HalfrevT; //time of one half revolution
volatile unsigned long Atrigger; //time when A is triggered (Falling)
volatile boolean flag = false; //flag to keep B from being less than A
boolean Dirflag; //true = clockwise rotation
//calculated values
long Volume; //L/min
long VolumeKG; //Volume/KG/min
long Frate; //Flowrate/min
long Weight = 60; //initial weight
long RPM = 700; // so LED buzzer does not freak out for now - will be dependent on Frate
//storage variables
volatile long Time_store; //time storage
long DirT_store; //time difference storage
long HalfrevT_store; //half-revolution time storage
//print storage - used for conversion when printing to the LCD
char volume[10];
char frate[10];
char dirt_store[10];
char halfrevt_store[10];
char weight[10];
//Inputs/Outputs
//LEDs - All on PortC
int T_Red = 18; //A4
int T_Orange = 17;
int Green = 16;
int B_Orange = 15;
int B_Red = 14; //A0
//Buzzer
int Buzzer = 19; //A5
//Buttons
const int Left = 4; //< button
const int OK = 5; //* button
const int Right = 6; //> button
int L_Button_state = 0; //pointer for < button
int R_Button_state = 0; //pointer for * button
int OK_Button_state = 0; //pointer for > button
int change_flag = 1; //flag to indicate weight has increased/decreased
//Function declaration
void Weight_input(); //Weight input function
boolean Direction(); //Calculates the ratio between DirT and halfrev
long calc_Volume(); //Calculates the volume of air passing through the turbine and outputs data to LCD
long calc_FRate(); //Calculates the rate of flow through the turbine
void LEDs_Buzzer(); //Determines which LED to light and if the Buzzer should sound
//Interrupts
void A_ISR() //Interrupt service routine for A(Falling)
{
Time_store = micros(); //Time is stored since two values need to be set to micros()
if (!flag)
{
HalfrevT = Time_store - Atrigger; //halfrevolution is current time - previous trigger time
Atrigger = Time_store; //sets trigger to the stored time
}
}
void B_ISR() //Interrupt service routine for B(rising)
{
if (!flag)
{
DirT = micros() - Atrigger; //DirT is current time - the time A was triggered
flag = true; //sets the flag so that A is always less than B
}
}
void setup()
{
DDRD = DDRD | B10000000; //setting pins 0-6 as inputs - faster than (pinMode(Left, INPUT); & pinMode(OK, INPUT); & pinMode(Right, INPUT);
u8g.firstPage();
do
{
Innovus();
}
while(u8g.nextPage());
delay(2000); //wait a bit...
u8g.setFont(u8g_font_unifont); //sets the Font away from italic for Innovus Logo
//Ask to rotate the display? --Library only permits one call to rotation
Weight_input(); //Ask the user if he/she is happy with the weight - buttons do not always register... fix/debounce?
//Set Interrupts
Atrigger = micros(); //assign a value so it is != zero
attachInterrupt(0, A_ISR, FALLING); //A is pulled low by Pin 2
attachInterrupt(1, B_ISR, RISING); //B rises on Pin 3
}
void loop() //reset button needs to be added to circuit...
{
if (flag)
{
if (DirT>0)
{
//Store variables for printing
DirT_store = DirT;
HalfrevT_store = HalfrevT;
flag = false;
//Calculations
Direction();
calc_Volume();
calc_FRate();
if ( (intLCDdisplay++ % DISPLAY_RATE) == 0 ) //LCD prints only every x loops to avoid slowing down entire sketch.
{
LEDs_Buzzer(); //Lights up LEDs and sounds buzzer
u8g.firstPage();
do
{
Data();
}
while( u8g.nextPage() );
}
}
}
}
//Functions (rubbish calculations except for direction)
boolean Direction() //calculates a ratio using the time difference and half revolution time
{
if (HalfrevT_store/DirT_store<4)
{
Dirflag = true; //clockwise/IN
}
else
{
Dirflag = false;
}
}
long calc_Volume()
{
Volume = HalfrevT_store*1.035;
VolumeKG = Volume/Weight;
if (Dirflag) //clockwise/IN
{
//add Volume to Volume_IN
}
else
{
//add Volume to Volume_OUT
}
return Volume;
}
long calc_FRate()
{
Frate = 1.02*1586*pow(HalfrevT_store/100,-1.013); //revolution time is in Micros instead of Millis
// if (Dirflag)
// {
// //total flowrate?
// }
// else
// {
// }
return Frate;
}
void LEDs_Buzzer()
{
if (RPM>2000)
{
PORTC = B00110000; //A4/T_Red high & A5/Buzzer high
}
else if (RPM>1500)
{
PORTC = B00001000; //A3/T_Orange high
}
else if (RPM>1000)
{
PORTC = B00000100; //A2/Green high
}
else if (RPM>500)
{
PORTC = B00000010; //A1/B_Orange high
}
else
{
PORTC = B00000001; //A0/B_Red high
}
}
void Weight_input()
{
do //do while waiting for OK/* button to be pressed
{
if (change_flag == 1)
{
u8g.firstPage();
do
{
W_input();
}
while(u8g.nextPage());
change_flag = 0;
}
//save button states
L_Button_state = digitalRead(Left);
R_Button_state = digitalRead(Right);
OK_Button_state = digitalRead(OK);
delay(100);
//< Button
if (L_Button_state == LOW)
{
if (Weight >=10)
{
Weight = Weight-5;
change_flag = 1;
}
else if (Weight >=2)
{
Weight = Weight-1;
change_flag = 1;
}
else
change_flag = 0; //Add 100 miligram set?
L_Button_state = HIGH;
}
else
L_Button_state = LOW;
//> Button
if (R_Button_state == LOW)
{
if (Weight >=5)
Weight = Weight+5;
else if (Weight >=1)
Weight = Weight+1;
change_flag = 1;
R_Button_state = HIGH;
}
else
R_Button_state = LOW;
}
while(OK_Button_state == HIGH); // Wait for OK button to go low
u8g.firstPage();
do
{
u8g.drawStr( 17, 22, "Start!");
}
while(u8g.nextPage());
delay(3000);
}
void W_input(void)
{
sprintf(weight, "%ld", Weight);
u8g.drawStr( 0, 10, "Weight:");
u8g.drawStr( 20, 28, weight);
u8g.drawStr( 44, 28, "KG");
u8g.drawStr( 2, 47, "- Ok +");
}
void Data(void)
{
//http://www.cplusplus.com/reference/clibrary/cstdio/sprintf/
//convert all values since LCD can't print
sprintf(volume, "%ld", Volume);
sprintf(dirt_store, "%ld", DirT_store);
sprintf(halfrevt_store, "%ld", HalfrevT_store);
sprintf(frate, "%ld", Frate); //convert Frate from Long float to string
//Frate is totally bugger, can't get Decimals to show... float/double just blanks
//Draw strings
u8g.drawStr( 60, 11, "L/M");
u8g.drawStr( 0, 11, volume);
u8g.drawStr( 0, 23, frate);
u8g.drawStr( 0, 35, dirt_store);
u8g.drawStr( 0, 47, halfrevt_store);
// sprintf(rpm, "%ld", RPM);
//u8g.drawStr( 60, 23, "RPM");
//u8g.drawStr( 0, 23, rpm);
if (Dirflag)
{
u8g.drawStr( 60, 47, "In");
}
else
{
u8g.drawStr( 60, 47, "Out");
}
}
--cont on next post