Code:
/*
Arduino 4 digits 7 segments LED countdown timer with buzzerm from
electronicsblog.net. If You share/use this code elsewhere on the internet
please meantion this code source.
*/
// segment | Arduino board PIN number
#define G 22
#define F 23
#define A 24
#define B 25
#define E 26
#define D 27
#define C 28
#define DP 29
// Commonn cathodes control
#define GND1 52
#define GND2 53
#define GND3 50
#define GND4 51
// buttons
/*
Button_start - start/pause timer and in setup mode inreases minutes
and seconds values
Button_set - if timer is paused it resets timer to start. Long press
activates setup mode in which button is for going through minutes, seconds setup
and leaving setup mode.
*/
#define Button_start 48
#define Button_set 49
///
#define Buzzer 46
#define LED 47 // or relay insted
int i=0;
char run=0; // shows if timer is runnig
int b=0; //for buttons
int c=0;
int d=0; // for buzzer
char set_mode=0; // shows if timer is in setup mode
char alarm =0; // if "1" buzzer is on
//timer variables
// user setted and "turn on" values
int default_Sec=00;
int default_Min=10;
// current values
int Sec;
int Min;
//timer interrupt
ISR(TIMER1_OVF_vect) {
Sec--; // timer values decreases
TCNT1=0x0BDC;
}
// functions to display digits
void digit0 () {
// for 0 needed to turn ON F A B C D E segments, so:
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
//////////////////////// G segment should be turn OFF
digitalWrite(G, LOW);
};
void digit1 () {
digitalWrite(A,LOW);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit2 () {
digitalWrite(A,HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, HIGH);
};
void digit3 () {
digitalWrite(A,HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, HIGH);
};
void digit4 () {
digitalWrite(A,LOW);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit5 () {
digitalWrite(A,HIGH);
digitalWrite(B, LOW);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, LOW);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit6 () {
digitalWrite(A,HIGH);
digitalWrite(B, LOW);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit7 () {
digitalWrite(A,HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit8 () {
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit9 () {
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, LOW);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
//function to display digit from inputed int
void showdigit (int digit)
{
switch (digit) {
case 0:
digit0 ();
break;
case 1:
digit1 ();
break;
case 2:
digit2 ();
break;
case 3:
digit3 ();
break;
case 4:
digit4 ();
break;
case 5:
digit5 ();
break;
case 6:
digit6 ();
break;
case 7:
digit7 ();
break;
case 8:
digit8 ();
break;
case 9:
digit9 ();
break;
default:
break;
};
};
// showing 4 digits
// not only shows 4 digit number, but also there is option to turn on
//only selected digits and decimal point.
void showdigits (int number, char digit_on, char decimal_point)
{
digitalWrite(GND4, LOW);
// e.g. we have "1234"
showdigit(number/1000); // segments are set to display "1"
if (decimal_point&8) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&8) {
digitalWrite(GND1, HIGH); // first digit on,
digitalWrite(GND2, LOW); // other off
digitalWrite(GND3, LOW);
}
delay (1);
number = number%1000; // remainder of 1234/1000 is 234
digitalWrite(GND1, LOW); // first digit is off
showdigit(number/100); //// segments are set to display "2"
if (decimal_point&4) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&4) {
digitalWrite(GND2, HIGH); // second digit is on
} delay (1);// and so on....
number =number%100;
digitalWrite(GND2, LOW);
showdigit(number/10);
if (decimal_point&2) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&2) {
digitalWrite(GND3, HIGH);
}
delay (1);
number =number%10;
digitalWrite(GND3, LOW);
showdigit(number);
if (decimal_point&1) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&1) {
digitalWrite(GND4, HIGH);
}
delay (1);
};
void setup()
{
pinMode(A, OUTPUT);
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(F, OUTPUT);
pinMode(G, OUTPUT);
pinMode(DP, OUTPUT);
pinMode(GND1, OUTPUT);
pinMode(GND2, OUTPUT);
pinMode(GND3, OUTPUT);
pinMode(GND4, OUTPUT);
pinMode(Button_start, INPUT);
digitalWrite(Button_start, HIGH); //pull up resistor
pinMode(Button_set, INPUT);
digitalWrite(Button_set, HIGH); //pull up resistor
pinMode(Buzzer, OUTPUT);
pinMode(LED, OUTPUT);
TIMSK1=0x01; // enabled global and timer overflow interrupt;
TCCR1A = 0x00; // normal operation 148 page (mode0);
TCNT1=0x0BDC;
TCCR1B = 0x00; // stop hardware timer
// loading default timer values
Sec = default_Sec ;
Min = default_Min ;
};
void loop ()
{
//////////// button_start//////////
if (!digitalRead(Button_start)&&!b) {
if (!set_mode) { if (run) {TCCR1B=0x00; run=0;} else {TCCR1B=0x04; run=1;}}
if (set_mode==1) {Min++;}
if (set_mode==2) {Sec++;}
if (set_mode) {b=25;} else b=100;
};
if (!digitalRead(Button_start)&&b==1) {
};
if (!b==0) b--;
//////////// button_set/////////
if (!digitalRead(Button_set)&&!c) {
if(!run&&!set_mode) {Min=default_Min; Sec=default_Sec;}
if (set_mode>0) set_mode++;
if (set_mode==3) {set_mode=0; default_Sec = Sec ;
default_Min = Min; }
c=100; };
if (!digitalRead(Button_set)&&c==1&&!run) {
set_mode=1;
c=100;
};
if (!c==0) c--;
////////////////////////////
if (set_mode) {if (Sec==60) {Sec=00;}
if (Min==100) {Min=0;} }
else {
if (Sec==-1) {Min--;Sec=59;}
}
//decimal point indication control
if (!set_mode) {
if (!(Sec%2)) { showdigits (Min*100+Sec,0x0F,0x04); } //0X00
else {showdigits (Min*100+Sec,0x0F,0x00); }; //0000
} else {
if (set_mode==1) {
showdigits (Min*100+Sec,0x0F,0x0C); //XX00
} else {
showdigits (Min*100+Sec,0x0F,0x03); } //00XX
}
if (run) { // to do while timer is running; e.g. control relay
digitalWrite(LED, HIGH);
} else digitalWrite(LED, LOW);
if ((Min==0)&&(Sec==0)&&run) {
run=0;
TCCR1B=0x00; //stop timer
//// to do after count down is finished e.g. start alarm as in this example
alarm=1;
d=500;
}
// Alarm part
if (alarm) { if (!(d%100)) { // sound 500/100= 5 times ;
tone(Buzzer, 440, 200); }
d--;
if (d==0) {alarm=0; Sec = default_Sec ;
Min = default_Min ; // After alarm is off, timer goes to start
}
}
};
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