Bouw een Betrouwbare Arduino Afteltimer met SparkFun 7‑Segment Display

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• Arduino IDE

Over dit Project

Dit project is ontworpen omdat ik geen timer bij de hand had. Je uploadt de code naar je Arduino (elk type werkt) en de aftelling start automatisch. Wil je de totale tijd wijzigen? Pas dan deze regel in de code aan:

long n = 60000; // starttijd → KAN VERANDERD WORDEN IN ELKE GEWENSTE TIJD

Let op! 1000 = 1 seconde. Dus 60000 = 60 seconden. De formule (SECONDEN x 1000) geeft het getal dat je invult bij 60000. Druk je op de reset-knop, dan start de teller opnieuw.

Code

Gebruik deze code voor je afteltimer:

// 7-segment pin nummers - 7-segment licht - Arduino pin nummers
// pin 11 - A = 12
// pin 7  - B = 10
// pin 4  - C = 8
// pin 2  - D = 7
// pin 1  - E = 6
// pin 10 - F = 11
// pin 5  - G = 9
// pin 3 is decimaal

/* 12 11 10 9 8 7
   |  |  | | | |
   A --- F
   |  B | G | ---
   E | | C | |
   --- . dec D
   |  |  | | | |
   1  2  3  4  5  6 */

// pin 12 - eerste digit = 1
// pin 9  - tweede digit = 2
// pin 8  - derde digit = 3
// pin 6  - vierde digit = 4

const int a = 12;
const int b = 10;
const int c = 8;
const int d = 7;
const int e = 6;
const int f = 11;
const int g = 9;
int p = 0;
int startStopReset = 13;
const int d1 = 1;
const int d2 = 2;
const int d3 = 3;
const int d4 = 4;
long n = 60000; // starttijd → KAN VERANDERD WORDEN IN ELKE GEWENSTE TIJD
int x = 100;
int del = 55; // delay waarde

void setup() {
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
  pinMode(d3, OUTPUT);
  pinMode(d4, OUTPUT);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(p, OUTPUT);
  pinMode(startStopReset, INPUT);
  digitalWrite(startStopReset, HIGH);
}

void loop() {
  digitalWrite(p, HIGH);
  clearLEDs();
  pickDigit(1);
  pickNumber((n/x/1000)%10);
  delayMicroseconds(del);
  clearLEDs();
  pickDigit(2);
  pickNumber((n/x/100)%10);
  delayMicroseconds(del);
  clearLEDs();
  pickDigit(3);
  dispDec(3);
  pickNumber((n/x/10)%10);
  delayMicroseconds(del);
  clearLEDs();
  pickDigit(4);
  pickNumber(n/x%10);
  delayMicroseconds(del);
  n--; // 'n++' voor stopwatch
  if (digitalRead(13) == LOW) {
    n = 60000; // herstart-tijd → VERANDER NAAR OORSPRONKELIJKE STARTTIJD
  }
}

void pickDigit(int x) { // verandert digit
  digitalWrite(d1, HIGH);
  digitalWrite(d2, HIGH);
  digitalWrite(d3, HIGH);
  digitalWrite(d4, HIGH);
  switch(x) {
    case 1: digitalWrite(d1, LOW); break;
    case 2: digitalWrite(d2, LOW); break;
    case 3: digitalWrite(d3, LOW); digitalWrite(p, HIGH); break;
    default: digitalWrite(d4, LOW); break;
  }
}

void pickNumber(int x) { // verandert waarde van nummer
  switch(x) {
    default: zero(); break;
    case 1: one(); break;
    case 2: two(); break;
    case 3: three(); break;
    case 4: four(); break;
    case 5: five(); break;
    case 6: six(); break;
    case 7: seven(); break;
    case 8: eight(); break;
    case 9: nine(); break;
  }
}

void dispDec(int x) {
  digitalWrite(p, LOW);
}

void clearLEDs() {
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p, LOW);
}

void zero() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
}

void one() {
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void two() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}

void three() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}

void four() {
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

void five() {
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

void six() {
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

void seven() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void eight() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

void nine() {
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

Schema

Gebruik dit verbindingsschema om je 4-digit display met je Arduino te verbinden: