Minuteur Pomodoro

Contrôleur Pomodoro DIY

Ce projet est un timer Pomodoro physique imprimé en 3D conçu pour structurer les sessions de travail et de pause.

L'objectif est simple : transformer une méthode de productivité abstraite en un objet concret posé sur le bureau.

Grâce à un encodeur rotatif, il est possible de régler facilement la durée du timer.
Un bouton permet ensuite de lancer la session.

Pendant le fonctionnement :

• l'écran OLED affiche les informations du timer

• un anneau de LEDs indique visuellement l'état de la session

Le cycle fonctionne ainsi :

• 25 minutes de travail

• 5 minutes de pause

• puis le cycle recommence automatiquement.

Composants utilisés :  

• ESP32-C3 SuperMini

• Écran OLED 0.96" (I2C)

• Encodeur rotatif 

• LEDs WS2812B

• Bouton poussoir

• Film teinté

• Plaque acrylique ronde

• Inserts filetés M3

• Vis M3

L'acrylique nécessite un léger ponçage sur les bords pour entrer en force dans la pièce supérieur

Le code du projet :

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_NeoPixel.h>
#include <Encoder.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define SDA_PIN 8
#define SCL_PIN 9
#define LED_PIN 2
#define LED_COUNT 8
#define ENC_A 4
#define ENC_B 5
#define BTN 3   // bouton externe
#define BREAK_MINUTES 5
#define BREAK_INTERVAL_MINUTES 25
#define STEP_MINUTES 30
#define BREAK_INTERVAL_SECONDS (BREAK_INTERVAL_MINUTES * 60)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
Encoder encoder(ENC_A, ENC_B);
enum Mode
{
  MODE_SET,
  MODE_WORK,
  MODE_BREAK
};
Mode mode = MODE_SET;
int workMinutes = STEP_MINUTES;
int workRemainingSeconds = STEP_MINUTES * 60;
int breakRemainingSeconds = 0;
int remainingSeconds = STEP_MINUTES * 60;
int workElapsedSinceBreak = 0;
unsigned long totalWorkSeconds = 0;
unsigned long lastTick = 0;
long lastEncoderPos = 0;
bool lastButtonState = HIGH;
// ===== PROTOTYPES =====
void handleEncoder();
void handleButton();
void updateTimer();
void drawScreen();
void updateLEDs();
String formatDuration(int seconds);
String formatHoursMinutes(int seconds);
// ======================
// SETUP
// ======================
void setup()
{
  Serial.begin(115200);
  delay(500);
  pinMode(BTN, INPUT_PULLUP);
  Wire.begin(SDA_PIN, SCL_PIN);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
  {
    Serial.println("OLED FAIL");
    while(true);
  }
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.display();
  strip.begin();
  strip.setBrightness(100);
  strip.show();
  drawScreen();
  updateLEDs();
}
// ======================
// LOOP
// ======================
void loop()
{
  handleEncoder();
  handleButton();
  updateTimer();
}
// ======================
// ENCODER
// ======================
void handleEncoder()
{
  if(mode != MODE_SET) return;
  long pos = encoder.read() / 4;
  if(pos != lastEncoderPos)
  {
    int delta = pos - lastEncoderPos;
workMinutes += delta * STEP_MINUTES;

if(workMinutes &lt; STEP_MINUTES)
  workMinutes = STEP_MINUTES;

if(workMinutes &gt; 720)
  workMinutes = 720;

workRemainingSeconds = workMinutes * 60;
remainingSeconds = workRemainingSeconds;

lastEncoderPos = pos;

drawScreen();
updateLEDs();

  }
}
// ======================
// BUTTON
// ======================
void handleButton()
{
  bool state = digitalRead(BTN);
  if(lastButtonState == HIGH && state == LOW)
  {
    if(mode == MODE_SET)
    {
      mode = MODE_WORK;
      workRemainingSeconds = workMinutes * 60;
      remainingSeconds = workRemainingSeconds;
      workElapsedSinceBreak = 0;
      totalWorkSeconds = 0;
    }
    else
    {
      mode = MODE_SET;
      workRemainingSeconds = workMinutes * 60;
      remainingSeconds = workRemainingSeconds;
    }
drawScreen();
updateLEDs();
delay(200); // anti-rebond simple

  }
  lastButtonState = state;
}
// ======================
// TIMER
// ======================
void updateTimer()
{
  if(mode == MODE_SET) return;
  if(millis() - lastTick >= 1000)
  {
    lastTick = millis();
if(mode == MODE_WORK)
{
  workRemainingSeconds--;
  remainingSeconds = workRemainingSeconds;

  totalWorkSeconds++;
  workElapsedSinceBreak++;

  if(workElapsedSinceBreak &gt;= BREAK_INTERVAL_SECONDS &amp;&amp;
     workRemainingSeconds &gt; 0)
  {
    mode = MODE_BREAK;
    breakRemainingSeconds = BREAK_MINUTES * 60;
    remainingSeconds = breakRemainingSeconds;
    workElapsedSinceBreak = 0;
  }

  if(workRemainingSeconds &lt;= 0)
  {
    mode = MODE_SET;
    workRemainingSeconds = workMinutes * 60;
    remainingSeconds = workRemainingSeconds;
  }
}

else if(mode == MODE_BREAK)
{
  breakRemainingSeconds--;
  remainingSeconds = breakRemainingSeconds;

  if(breakRemainingSeconds &lt;= 0)
  {
    mode = MODE_WORK;
    remainingSeconds = workRemainingSeconds;
  }
}

drawScreen();
updateLEDs();

  }
}
// ======================
// DISPLAY
// ======================
void drawScreen()
{
  display.clearDisplay();
  String timeStr = formatDuration(remainingSeconds);
  display.setTextSize(4); // très gros
  int16_t x1, y1;
  uint16_t w, h;
  display.getTextBounds(timeStr, 0, 0, &x1, &y1, &w, &h);
  int x = (SCREEN_WIDTH - w) / 2;
  int y = (SCREEN_HEIGHT - h) / 2;
  display.setCursor(x, y);
  display.print(timeStr);
  display.display();
}
// ======================
// FORMAT FUNCTIONS
// ======================
String formatDuration(int seconds)
{
  int hours = seconds / 3600;
  int minutes = (seconds % 3600) / 60;
  int secs = seconds % 60;
  char buffer[16];
  if(hours > 0)
    sprintf(buffer,"%dh%02d",hours,minutes);
  else
    sprintf(buffer,"%02d:%02d",minutes,secs);
  return String(buffer);
}
String formatHoursMinutes(int seconds)
{
  int hours = seconds / 3600;
  int minutes = (seconds % 3600) / 60;
  char buffer[16];
  sprintf(buffer,"%dh%02d",hours,minutes);
  return String(buffer);
}
// ======================
// LED CONTROL
// ======================
void updateLEDs()
{
  if(mode == MODE_SET)
  {
    for(int i=0;i<LED_COUNT;i++)
      strip.setPixelColor(i, strip.Color(60,60,60));
  }
  else if(mode == MODE_WORK)
  {
    int ledsOn = map(remainingSeconds, 0, workMinutes*60, 0, LED_COUNT);
for(int i=0;i&lt;LED_COUNT;i++)
{
  if(i &lt; ledsOn)
    strip.setPixelColor(i, strip.Color(0,150,0));
  else
    strip.setPixelColor(i, 0);
}

  }
  else
  {
    int ledsOn = map(remainingSeconds, 0, BREAK_MINUTES*60, 0, LED_COUNT);
for(int i=0;i&lt;LED_COUNT;i++)
{
  if(i &lt; ledsOn)
    strip.setPixelColor(i, strip.Color(0,0,150));
  else
    strip.setPixelColor(i, 0);
}

  }
  strip.show();
}