Published July 13, 2019

The Cheapest and Simplest Pulse Counter

This counter is made only from an ATtiny13 and LED diodes.

IntermediateProtip2,689

Things used in this project

Hardware components

Microchip ATtiny13

LED L-144

Resistor 100 ohm

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Tweezer

Story

Did you ever need a cheap and simple (with one digit only) pulse counter?

This is the maximum optimization and simplification. Thanks to Charlie Allen.

Connect 7 LEDs L-144 (2x5mm) as on pictures below:

1 / 3

In the Arduino IDE -> Preferences add this Additional Boards: https://mcudude.github.io/MicroCore/package_MCUdude_MicroCore_index.json

Next in the Arduino IDE -> Tools -> Board -> Boards Manager find ATtiny13 and add this package.

Select clock for ATtiny13:

Flash it:

Connect the microcontroller with diodes, 100Ω resistors and button (pin 0) as show in the pictures below:

1 / 3

Connect 5V and it is ready!

Number 3 is like inverted C but it is understandable. Of course, you can connect segment F separately but this is great task for you. :-)

Code

Licz_ATtiny13_7seg.ino

// ----------------   licznik na jednym wyswietlaczu siedmiosegmentowym, przerwanie sprzetowe zwieksza liczbe
// ----------------   2019-07-10  LucasWiackowski(at)gmail.com

#define SEG_CDEG 1
#define SEG_AFED 0
#define SEG_AFBG 2
#define SEG_BC   3
#define ODST     5
#define INTENS  33

volatile byte i=0;

ISR(PCINT0_vect) {
  PCMSK &= ~(1<<PCINT4);
  PORTB &= ~_BV(SEG_AFED) & ~_BV(SEG_AFBG) & ~_BV(SEG_BC) & ~_BV(SEG_CDEG);
  i=++i>19?0:i;
  delay(222);
  PCMSK |= (1<<PCINT4);
}

void setup() {
  DDRB &= ~(1<<PB4);
  PORTB |= 1<<PB4;
  MCUCR |= (1<<ISC00) | (1<<ISC01);
  PCMSK |= (1<<PCINT4);
  GIMSK |= (1<<PCIE);

  DDRB |= _BV(SEG_AFED) | _BV(SEG_AFBG) | _BV(SEG_BC) | _BV(SEG_CDEG);
}

void loop() {
  if(i<10) poka(i);
  else {
    poka(i/10);
    poka(11);
    poka(i%10);
    poka(10);
    poka(11);
  }
}

void poka(const byte j) {
  for(byte k=0; k<INTENS; k++) {
      switch(j) {
        case 0:
          PORTB |= _BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST+ODST);
          break;
        case 1:
          PORTB |= _BV(SEG_BC);
          delay(ODST+ODST+ODST);
          break;
        case 2:
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          PORTB |= _BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          break;
        case 3:
          PORTB |= _BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFED);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          break;
        case 4:
          PORTB |= _BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_BC);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_BC);
          delay(ODST+ODST);
          break;
        case 5:
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          PORTB |= _BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          break;
        case 6: 
          PORTB |= _BV(SEG_AFED);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB |= _BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          break;
        case 7:
          PORTB |= _BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST+ODST);
          break;
        case 8: 
          PORTB |= _BV(SEG_AFBG);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          break;
        case 9: 
          PORTB &= ~_BV(SEG_AFED);
          PORTB |= _BV(SEG_BC);
          PORTB &= ~_BV(SEG_CDEG);
          delay(ODST);
          PORTB |= _BV(SEG_AFBG);
          delay(ODST);
          PORTB &= ~_BV(SEG_AFBG);
          PORTB |= _BV(SEG_AFED);
          PORTB &= ~_BV(SEG_BC);
          PORTB |= _BV(SEG_CDEG);
          delay(ODST);
          break;
        case 10:
          PORTB |= _BV(SEG_CDEG);
          delay(ODST+ODST+ODST);
          break;
        default:
          delay(ODST);
    }
  }
  PORTB &= ~_BV(SEG_AFED);
  PORTB &= ~_BV(SEG_AFBG);
  PORTB &= ~_BV(SEG_BC);
  PORTB &= ~_BV(SEG_CDEG);
}

Credits

dj-lukas

1 project • 6 followers

The Cheapest and Simplest Pulse Counter

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Charliplexed 7 segment display

Code

Licz_ATtiny13_7seg.ino

Credits

dj-lukas

Comments

Embed the widget on your own site

The Cheapest and Simplest Pulse Counter

The Cheapest and Simplest Pulse Counter

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Charliplexed 7 segment display

Code

Licz_ATtiny13_7seg.ino

Credits

dj-lukas

Comments

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