Calendar Clock: Background · Display · Sound Effects · Dream CDIO Clock Tutorial

🕐 Calendar Clock — A Complete CDIO Engineering Project

📋 Project Overview

A complete CDIO engineering practice project — build a smart desktop device integrating clock display, calendar query, alarm reminder, and temperature/humidity monitoring.

🔵 C — Conceive

• Needs analysis: what kind of clock do I want? (digital / analog / hybrid?)
• User research: what extra needs do family members have?
• Function definition: core vs. nice-to-have trade-offs
• Feasibility: can current materials and skills finish it?

🟢 D — Design

• Appearance: hand sketch → digital model (optional Tinkercad)
• Circuit: schematic (Fritzing / Breadboard)
• Program architecture: flowchart + state diagram + timing diagram
• BOM: list all components and materials

🟡 I — Implement

• Hardware:
  - Arduino main board + LCD1602 / I2C display
  - DS3231 RTC real-time clock module
  - DHT11 temperature/humidity sensor
  - Passive buzzer + buttons
  - Wooden / acrylic case cut and assembled
• Software:
  - Time reading and formatted display
  - Date calculation (day of week / leap year)
  - Alarm setting and trigger logic
  - Hourly chime melody programming
  - Temperature/humidity acquisition and display

🔴 O — Operate

• Function testing: accept each feature item by item
• Bug fixing: record problems and iterate
• User trial: give to family for a week, collect feedback
• Documentation: write a complete user manual
• Showcase: present your work in class / community

🎵 Feature: Hourly Chime

Dr. Cao teaches you to play classic melodies like "Two Tigers" and "Twinkle Twinkle" on the buzzer as hourly chimes — making the clock more fun!