seeed-studio / grove_4digital_display Goto Github PK

#include <Arduino.h>
#include <EEPROM.h>
#include <TM1637.h>
// Seconds to add to timer per 25c
int QuarterTimeAdd=300;

//clock and data pins for display
int CLK = 3;
int DIO = 4;
// relay pin
int relayPin = 5;

//defining variables for display
TM1637 tm(CLK,DIO);

// variable use to measure the intervals inbetween impulses
volatile int i=0;
// Number of impulses detected
volatile int impulsCount=0;
// Time left to run motor in seconds
volatile int time_left=0;
//Minutes and seconds variables derived from time_left
volatile int minutes=0;
volatile int seconds=0;
//Minutes and seconds variables to display on timer
volatile int tensOfMin_left=0;
volatile int Min_left=0;
volatile int tensOfSec_left=0;
volatile int Sec_left=0;
//arduino timer storage variable
boolean toggle1 = 0;

void setup() {
 // Serial.begin(9600);
 // setting up timer1 on arduino for 1hz (every second)
 cli();//stop interrupts
 //set timer1 interrupt at 1Hz
  TCCR1A = 0;// set entire TCCR1A register to 0
  TCCR1B = 0;// same for TCCR1B
  TCNT1  = 0;//initialize counter value to 0
  // set compare match register for 1hz increments
  OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS10 and CS12 bits for 1024 prescaler
  TCCR1B |= (1 << CS12) | (1 << CS10);  
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
  sei();//allow interrupts  
  
  // Interrupt connected to PIN D2 executing IncomingImpuls function when signal goes from HIGH to LOW
 attachInterrupt(digitalPinToInterrupt(2),incomingImpuls, FALLING);
 
 // setting up relayPin as output
  pinMode(relayPin, OUTPUT);
  
  //initalizing display
  tm.init();
  //set brightness; 0-7
  tm.set(7);
}

void incomingImpuls()
{
  cli();
  impulsCount=impulsCount+1;
  i=0;
  sei();
}

ISR(TIMER1_COMPA_vect){//timer1 interrupt 1Hz subtracts 1 from time_left)
//generates pulse wave of frequency 1Hz/2 = 0.5kHz (takes two cycles for full wave- toggle high then toggle low)
  if (toggle1){
    if (time_left <= 0){}
    else{
    time_left = time_left - 1;
    toggle1 = 0;
    }
  }
  else{
    if (time_left <= 0){}
    else{
    toggle1 = 1;
    time_left = time_left - 1;
  }
  }
}  
void loop() {
//  Serial.println(time_left);
  //i ,intervul between pulses, is increased by 1 for each loop
  i=i+1;

// if coin counter detects quarter add 25 to time_left
 if (i>=30 and impulsCount==1){
   cli();
       if (time_left <=0){
      time_left = QuarterTimeAdd;
      }
      else{
    time_left=time_left+QuarterTimeAdd;
      }
    impulsCount=0;

    sei();
  }
//converting time_left in seconds to munites and seconds
seconds = time_left % 60;
minutes = time_left / 60;
//converting minutes and seconds to digits to be displayed
tensOfMin_left = minutes / 10;
Min_left = minutes % 10;
tensOfSec_left = seconds / 10;
Sec_left = seconds % 10;

//if time is <= 0 display 25CE else display time_left
// 7 segment displays these characters at these values 0-9=0-9 10-15=A-F 16=top segment blink 17=all segments stutter 18=pattern of filling in segments 19=top+topleft segments lit 20=all segments off
if(time_left<=0){
    tm.display(0,20);
  tm.display(1,20);
  tm.point(0);
  tm.display(2,20);
  tm.display(3,20 );
}
else{
    tm.display(0,tensOfMin_left);
  tm.display(1,Min_left);
  tm.point(1);
  tm.display(2,tensOfSec_left);
  tm.display(3,Sec_left);
}

// if time_left <=0 set relay pin to low else set it to high
if(time_left<=0){
  digitalWrite(relayPin,LOW);
  }
else{
  digitalWrite(relayPin,HIGH);
  }
// Serial.println(time_left);
}```

float num=37.10;
tm1637.displayNum(num, 2);