Retro View Timer

Project tutorial

Components and supplies

Arduino Nano R3

You can use any other

SparkFun Big Easy Driver

Possible with H-Bridge and unipolar steppers

OpenBuilds NEMA 17 Stepper Motor

Small setepper is enough for small design. You can get it from DVD-ROM or laser printer

Breadboard (generic)

Jumper wires (generic)

LED (generic)

SparkFun Pushbutton switch 12mm

Necessary tools and machines

Soldering iron (generic)

Apps and online services

Arduino IDE

About this project

In fittness club my friend asked me to design digital timer for to measure user excercises. After a while i could not find big 7 segment display so i decided to do this project in my way; "Old Fashion, New Tech!"

I tried various types of servos, DC motors with encoders but my friends old laser printer saved me from long wires. Finally i fixed motor problem with stepper motor and easy driver.

Plastic parts produced with Arduino GRBL CNC machine. Black base part recovered from lab type gas torch.

Wood parts are not polished. After doing some changes, i will polish that or may be i can make some shades with gas torch.

Arduino is connected with sockets. I use this Arduino in different projects. (Arduino is not cheap in my country (Turkey))

Easy driver, pull-down resistors and tactile buttons are soldered on pcb. L7812cv attached for led strip. Thin sticks are holding box a little bit for light beam.

Video is in Turkish but i added subtitles

Code

Arduino Code - TRArduino

Explained in Turkish

int dir = 12;
int pulse = 11;
int drvAktif = 10;

int saatAyar = 125;

int buton1 = 8;
int buton2 = 7;
int ledPin = 9;

int sayac = 0;
int uyariSayaci = 0;
int limit = 1;
int limitLed = 0;
int uyariLimit;
int sayacAktif = false;

int t;
int t2;

void setup() {
  Serial.begin(9600);
  pinMode(buton1, INPUT);
  pinMode(buton2, INPUT);

  pinMode(ledPin, OUTPUT);
  pinMode(drvAktif, OUTPUT);
  pinMode(dir, OUTPUT);
  pinMode(pulse, OUTPUT);

  digitalWrite(dir, LOW);
  digitalWrite(pulse, LOW);
  digitalWrite(drvAktif, HIGH);
}
void loop() {
  //---------Buton Kontrolleri---------------------------------

  while (digitalRead(buton2) == HIGH && sayacAktif == false) {
    t++;
    delay(1);
  }
  if (t > 500) {
    saatAyar = 125;
    t = 0;

  }
  if (t > 50 && t < 500) {
    saatAyar = saatAyar + 125;
    delay(100);
    t = 0;
  }
  //----------Set ayarları---------------------------------------
  while (digitalRead(buton1) == HIGH && sayacAktif == false) {
    t2++;
    delay(1);
  }
  if (t2 < 500 && t2 > 50) {
    limit = limit + 1;
    delay(100);
    if (limit > 5) {
      limit = 1;
    }
    while (limitLed < limit) {
      analogWrite(ledPin, 200);
      delay(150);
      analogWrite(ledPin, 0);
      delay(200);
      limitLed = limitLed + 1;
    }
    limitLed = 0;
    t2 = 0;
  }

  if (t2 > 500) {
    sayac = 0;
    sayacAktif = true;
    delay(100);
    t2 = 0;
  }

  Serial.print(limit);
  Serial.print("\t");
  Serial.print(sayac);
  Serial.print("\t");
  Serial.print(saatAyar);
  Serial.print("\t");
  Serial.println(sayacAktif);
  delay(1);
  //---------Buton Kontrolleri---------------------------------
  while (sayacAktif == true && sayac < limit) {
    //---------uyarı bölümü----------------------------------
    uyariLimit = limit - sayac;
    while (uyariLimit > uyariSayaci) {
      delay(300);
      analogWrite(ledPin, 200);
      delay(150);
      analogWrite(ledPin, 0);
      delay(300);
      uyariSayaci = uyariSayaci + 1;
    }
    uyariSayaci = 0;
    //---------uyarı bölümü----------------------------------
    geriSayim();
    sayac = sayac + 1;
    if ( sayac == limit) {
      sayacAktif = false;
      digitalWrite(drvAktif, HIGH);
    }
  }
}
void geriSayim() {

  digitalWrite(drvAktif, LOW);
  digitalWrite(dir, LOW);
  for (int i = 0; i <= 240; i++) {
    analogWrite(ledPin, i);
    digitalWrite(pulse, HIGH);
    delayMicroseconds(50);
    digitalWrite(pulse, LOW);
    delay(saatAyar);

  }

  delay(100);
  digitalWrite(dir, HIGH);
  for (int i = 0; i <= 240; i++) {
    analogWrite(ledPin, 240 - i);
    digitalWrite(pulse, HIGH);
    delayMicroseconds(50);
    digitalWrite(pulse, LOW);
    delayMicroseconds(2500);
  }
}

Arduino Code - EnArduino

Explained in English

int dir = 12;
int pulse = 11;
int drvActive = 10;

int timeSet = 125;

int buton1 = 8;
int buton2 = 7;
int ledPin = 9;

int counter = 0;
int warnCount = 0;
int limit = 1;
int limitLed = 0;
int warnLimit;
int counterActive = false;

int t;
int t2;

void setup() {
  Serial.begin(9600);
  pinMode(buton1, INPUT);
  pinMode(buton2, INPUT);

  pinMode(ledPin, OUTPUT);
  pinMode(drvActive, OUTPUT);
  pinMode(dir, OUTPUT);
  pinMode(pulse, OUTPUT);

  digitalWrite(dir, LOW);
  digitalWrite(pulse, LOW);
  digitalWrite(drvActive, HIGH);
}
void loop() {
  //---------Button Controller---------------------------------

  while (digitalRead(buton2) == HIGH && counterActive == false) {
    t++;
    delay(1);
  }
  if (t > 500) {
    timeSet = 125;
    t = 0;

  }
  if (t > 50 && t < 500) {
    timeSet = timeSet + 125;
    delay(100);
    t = 0;
  }
  //----------Set Settings---------------------------------------
  while (digitalRead(buton1) == HIGH && counterActive == false) {
    t2++;
    delay(1);
  }
  if (t2 < 500 && t2 > 50) {
    limit = limit + 1;
    delay(100);
    if (limit > 5) {
      limit = 1;
    }
    while (limitLed < limit) {
      analogWrite(ledPin, 200);
      delay(150);
      analogWrite(ledPin, 0);
      delay(200);
      limitLed = limitLed + 1;
    }
    limitLed = 0;
    t2 = 0;
  }

  if (t2 > 500) {
    counter = 0;
    counterActive = true;
    delay(100);
    t2 = 0;
  }

  Serial.print(limit);
  Serial.print("\t");
  Serial.print(counter);
  Serial.print("\t");
  Serial.print(timeSet);
  Serial.print("\t");
  Serial.println(counterActive);
  delay(1);
  //---------Buton Controller---------------------------------
  while (counterActive == true && counter < limit) {
    //---------Warning Part----------------------------------
    warnLimit = limit - counter;
    while (warnLimit > warnCount) {
      delay(300);
      analogWrite(ledPin, 200);
      delay(150);
      analogWrite(ledPin, 0);
      delay(300);
      warnCount = warnCount + 1;
    }
    warnCount = 0;
    //---------Warning Part----------------------------------
    countDown();
    counter = counter + 1;
    if ( counter == limit) {
      counterActive = false;
      digitalWrite(drvActive, HIGH);
    }
  }
}
void countDown() {
//------------Countdown Starts here---------------------
  digitalWrite(drvActive, LOW);
  digitalWrite(dir, LOW);
  for (int i = 0; i <= 240; i++) {
    analogWrite(ledPin, i);
    digitalWrite(pulse, HIGH);
    delayMicroseconds(50);
    digitalWrite(pulse, LOW);
    delay(timeSet);

  }

  delay(100);
  digitalWrite(dir, HIGH);
  for (int i = 0; i <= 240; i++) {
    analogWrite(ledPin, 240 - i);
    digitalWrite(pulse, HIGH);
    delayMicroseconds(50);
    digitalWrite(pulse, LOW);
    delayMicroseconds(2500);
  }
}