Description

Base10 - A maker wearable Binary Watch

With today’s abundance of digital, connected watches—showing the time, your sleep quality, steps, heart rate, and more—something was missing: a watch that’s simply a watch, but in a cooler way. Why not tell the time in a maker’s style!?

Based on my binary desk clock, I decided to create a wrist version: a watch you’ll wear proudly, showing it off to friends and enjoying their puzzled faces as they try to figure out how those LEDs can represent the time!

The clock will get a NTP time once and show the hour and minute in a binary representation

( binary clock - table version )

Code

A first attempt to display clock time in leds

C/C++

#include <FastLED.h>
#include <TimeLib.h>
 
#define NUM_LEDS 20
#define DATA_PIN 8
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
 
CRGB leds[NUM_LEDS];
unsigned long previousMillis = 0;
const long interval = 1000; // Atualiza a cada segundo
 
// Definição dos grupos de LEDs
const int segundos_unidade[] = {0, 1, 2, 3};       // 4 bits (0-9)
const int segundos_dezena[] = {6, 5, 4};            // 3 bits (0-5)
const int minutos_unidade[] = {7, 8, 9, 10};        // 4 bits (0-9)
const int minutos_dezena[] = {14, 13, 12};          // 3 bits (0-5)
const int horas_unidade[] = {15, 16, 17, 18};       // 4 bits (0-9)
const int horas_dezena[] = {20, 19};                // 2 bits (0-2)
 
void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(50);
  Serial.begin(9600);
}
 
void loop() {
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    
    // Obter tempo atual
    int segundos = second();
    int minutos = minute();
    int horas = hour();
    
    // Separar dígitos
    int segundos_un = segundos % 10;
    int segundos_dez = segundos / 10;
    
    int minutos_un = minutos % 10;
    int minutos_dez = minutos / 10;
    
    int horas_un = horas % 10;
    int horas_dez = horas / 10;
    
    // Limpar todos os LEDs
    FastLED.clear();
    
    // Atualizar displays
    displayBinary(segundos_unidade, 4, segundos_un, CRGB::Red);
    displayBinary(segundos_dezena, 3, segundos_dez, CRGB::Red);
    
    displayBinary(minutos_unidade, 4, minutos_un, CRGB::Red);
    displayBinary(minutos_dezena, 3, minutos_dez, CRGB::Red);
    
    displayBinary(horas_unidade, 4, horas_un, CRGB::Red);
    displayBinary(horas_dezena, 2, horas_dez, CRGB::Red);
    
    FastLED.show();
  }
}
 
// Função para exibir um número em binário em um grupo de LEDs
void displayBinary(const int *ledArray, int size, int number, CRGB color) {
  for (int i = 0; i < size; i++) {
    if (bitRead(number, i)) {
      leds[ledArray[i]] = color;
    }
  }
}

Schematic and Layout

Schematic

Schematic_PCBChallenge2025_2025-09-07.pdf

Download Gerbers Download BOM(Bill of materials)

Sep 07,2025

221 views

Base10 - A maker wearable Binary Watch

A wearable binary clock: a simple, fun, and geeky way to tell time and impress friends with glowing LED logic.

221

Published: Sep 07,2025

Standard PCB

Download Gerber file 2

BOM(Bill of materials)

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