Smart Binary Clock (ESP32)

Overview

This is a sleek, 3D-printed binary clock powered by an ESP32 microcontroller. It combines modern technology with a minimalist aesthetic, making it a perfect "geeky" conversation piece for any desk or office.

Key Features

• NTP Synchronization: The clock automatically fetches precise time over Wi-Fi, ensuring it's always accurate without manual adjustments.
• RTC Hardware Backup: Includes support for a DS3231 module to maintain time during power outages or when Wi-Fi is unavailable.
• Efficient LED Driving: Controls 17 LEDs using only 3 data pins through a daisy-chain of shift registers.
• Optimized for Bambu Lab A1: The enclosure is specifically designed for high-quality results on the Bambu Lab A1 printer.

How to Read the Time

The LEDs are organized into three vertical columns: Hours (Left), Minutes (Center), and Seconds (Right). Each row represents a binary bit value (from bottom to top):

• Row 1: 1
• Row 2: 2
• Row 3: 4
• Row 4: 8
• Row 5 (Hours Only): 16

Simply sum the values of the lit LEDs in each column to read the current time.

Bill of Materials (BOM)

• Microcontroller: 1x ESP32 Development Board (e.g., ESP32 DevKit V1).
• Display: 17x Blue LEDs (5mm or 3mm).
• Resistors: 17x 1K Ohm resistors (one for each LED to ensure stable current).
• Logic: 3x 74HC595 Shift Registers (daisy-chained).
• Timekeeping: 1x DS3231 RTC Module for high-precision hardware backup.
• Power: 1x USB Cable (Micro-USB or USB-C, depending on your ESP32 board).
• Prototyping: 1x Perf-board or custom PCB, plus jumper wires for connections.

Source Code & Documentation

The full source code with detailed English comments and license info is available on my GitHub repository: [https://github.com/yossiRav/Smart-Binary-Clock](https://github.com/yossiRav/Smart-Binary-Clock)