16. System Integration
For System Integration Week, I focused on planning how all hardware, electronics, enclosure
components, and embedded systems would work together as one complete final project. My goal
was to move beyond a simple prototype and begin integrating all systems into a clean, polished,
and functional finished product.
The project combines:
- embedded programming
- electronics integration
- sensor systems
- display systems
- enclosure fabrication
- packaging design
- power management
- internal component organization
System Integration Goals:
- Integrate all electronics into a single wooden enclosure
- Organize internal wiring for easier maintenance
- Reduce exposed components and loose wiring
- Improve durability and visual quality
- Design enclosure around actual component dimensions
- Ensure all components remain accessible for testing and troubleshooting
- Create a cleaner “consumer device” appearance instead of a loose prototype
- Main Controller
- Seeed Studio XIAO RP2040
OR
- Arduino Uno R3 WiFi
The microcontroller serves as the main processing unit and coordinates all sensor
readings, LED outputs, and LCD display updates.
Sensor Integration:
DHT22 Temperature and Humidity Sensor
The DHT22 sensor is mounted through the top enclosure panel so it can collect
more accurate environmental readings while remaining securely attached to the enclosure.
Display Integration:
- 16x4 LCD display
The LCD display is mounted into the front panel of the enclosure and recessed
into the wood to improve overall appearance and create a more finished product look.
The display provides:
- project title
- date
- local time
- current temperature
- humidity readings
LED Integration:
The front panel contains:
4 temperature status LEDs
1 humidity status LED
The LEDs visually communicate environmental conditions without
requiring the user to constantly read the LCD screen.
Packaging and Enclosure Design:
The enclosure was redesigned from a previous 3D printed prototype
into a polished wooden enclosure to improve:
- appearance
- strength
- surface finish
- durability
- overall product presentation
The enclosure consists of:
- top panel
- bottom panel
- left side panel
- right side panel
- front panel
- rear access panel
All electronics are packaged internally to reduce clutter and improve organization.
Internal Layout Strategy:
The internal layout was planned to:
- separate wiring paths
- reduce cable overlap
- allow airflow around electronics
- provide access to the USB power connection
- simplify future troubleshooting
The XIAO RP2040 will be mounted internally near the rear of the enclosure to allow
easy USB access while minimizing visible wiring from the front.
CAD and Sketch Planning:
Before fabrication, enclosure dimensions and component locations were planned
using sketches and CAD-style layouts. These drawings were used to:
- determine spacing between components
- size LCD cutouts
- position LEDs
- locate sensor openings
- plan internal wiring routes
This planning process helped reduce fabrication errors before physical assembly began.
Methods of Packaging:
Several packaging and integration methods were planned for the final project:
- recessed LCD mounting
- internal wiring management
- enclosed electronics housing
- dedicated sensor opening
- rear USB access port
- sanded and polished exterior surfaces
- compact component layout
- internal microcontroller mounting
These methods were chosen to improve both functionality and visual presentation.
Finished Product Design Goals:
A major goal of this redesign was to make the device appear more like a
finished consumer product rather than a rough prototype.
To improve the overall finish, the enclosure will include:
- sanded edges
- symmetrical component placement
- polished wood finish
- organized front panel layout
- hidden internal electronics
- clean cable routing
The redesign focuses on improving both aesthetics and usability while integrating all
systems into a single functional device.
System Integration Summary:
This week focused on planning how all systems of the final project would work together
as one integrated device. By combining embedded electronics, sensors, displays, enclosure
fabrication, packaging methods, and internal component organization, the project moved
closer to a fully integrated final product suitable for final assembly and testing.
The system integration process also helped identify potential challenges involving spacing,
wiring organization, enclosure layout, and component placement before final fabrication begins.
Find out more info on the actual Final Project here: Final Project