Smart Desk Environment Monitor + Digital Clock

A compact desk gadget that shows:

• Time
• Temperature
• Humidity
• Air quality level (simple indicator)
• Optional RGB ambient glow

Built using an RP2040, DHT22, MQ-135, and a 128×64 I2C OLED. All wiring is done with jumper wires on a breadboard — no soldering required.

Features

• RP2040-based microcontroller (e.g. Raspberry Pi Pico)
• DHT22 temperature & humidity sensor
• MQ-135 air quality sensor
• 128×64 I2C OLED display
• Optional WS2812 RGB LED ring for visual effects
• MicroPython firmware
• Simple 3D-printed enclosure (TinkerCAD design)
• Designed as a daily-use desk tool for study sessions

System Block Diagram

• DHT22 → RP2040 (GPIO)
• MQ-135 → RP2040 (analog input or digital threshold)
• RP2040 → OLED (I2C)
• RP2040 → optional WS2812 ring
• RP2040 → USB (power + serial)

Hardware Plan

• Microcontroller: Raspberry Pi Pico / RP2040 board
• Sensors: DHT22 (temp+humidity), MQ-135 (air quality)
• Display: 128×64 OLED (I2C)
• Optional: WS2812 RGB LED ring
• Other: Breadboard, Dupont jumper wires, USB cable, 3D-printed case

Bill of Materials A detailed BOM is in bom/BOM.csv, but roughly:

• RP2040 board
• 128×64 OLED (I2C)
• DHT22 sensor
• MQ-135 sensor
• WS2812 RGB ring (optional)
• Breadboard + wires
• 3D printed case

Firmware Firmware will be written in MicroPython. Goals:

• Read DHT22 and MQ-135
• Show time + sensor values on OLED
• Show air-quality as text + icon/bar
• Drive optional WS2812 ring

/firmware/code.py will be the main entrypoint.

Project Structure Planned structure:

smart-environment-monitor/
├── firmware/
│   ├── code.py
│   └── modules/
├── assets/
│   ├── sketch.png
│   ├── block_diagram.png
│   └── cad_preview.png
├── cad/
│   ├── case.stl
│   └── faceplate.stl
├── bom/
│   └── BOM.csv
├── docs/
│   └── wiring.png
├── .gitignore
├── README.md
└── LICENSE