PCB Design Overview

The PCB design for this project includes several key components and features to ensure functionality and expandability. Below is a detailed overview of the components and layout:

Components and Layout

Figure 1: Schematic PCB Design

EasyEda project

Buttons

• Quantity: 3
• Type: Momentary push buttons
• Placement: Strategically placed for easy access and user interaction.
• Usage: These buttons can be used for various inputs such as mode selection, resetting the device, or triggering specific functions.

Arduino Space

• Placement: Centralized to minimize wiring complexity and optimize space.
• Usage: The Arduino Nano serves as the main microcontroller for the project.

Headers

• Type: Standard 0.1-inch pitch headers.
• Placement: Adjacent to the Arduino space for easy connectivity.
• Usage: These headers allow for future connections and expansions, such as adding sensors or additional peripherals.

Buzzer

• Type: Piezoelectric buzzer.
• Placement: Near the edge of the PCB to minimize interference with other components.
• Usage: Used for audio alerts or notifications.

RGB LED

• Type: Common cathode RGB LED.
• Placement: Visible and easily accessible for visual indications.
• Usage: Provides multicolor feedback based on the device's status or mode.

Battery Holders

• Type: Slots for standard AAA cell batteries or similar.
• Placement: Positioned in the back to balance the distribution of the PCB.
• Usage: Powers the device. Ensures easy replacement and secure connection.

Vibration Motor

• Type: Small DC vibration motor.
• Placement: Positioned to minimize interference with other components.
• Control: Driven by a MOSFET used as a switch to handle the current without burdening the Arduino.
• Usage: Provides haptic feedback or alerts.

Switch

• Type: Toggle switch.
• Placement: Easily accessible on the edge of the PCB.
• Usage: Used to turn the device on and off.

PCB Layout Considerations

• Component Placement: All components are placed with consideration for optimal routing, minimal interference, and ease of access for the user.
• Power Distribution: Power traces are designed to ensure stable and sufficient power supply to all components.
• Mounting Holes: Included for secure mounting of the PCB within an enclosure or other housing.
• Silkscreen Labels: Clear labeling of components, pins, and headers for easy assembly and troubleshooting.

This design ensures a robust, functional, and expandable PCB suitable for the project's requirements while allowing for future enhancements.