1. Group 41 Kevin Boldingh & Devansh Solanki
Smart Tool Chest
Group 41
Kevin Boldingh & Devansh Solanki

2. Overview Used in a lab or workshop Displays tool inventory
Tracks user credentials
Locks automatically

3. Design Block Diagram

4. Programming the ATmega324PA
Used the ATmega324PA microcontroller
Programmed with the Sparkfun Pocket AVR Programmer
Used Arduino IDE to compile C++ files
Programmed chip with AVRDUDE utility

5. Circuit/PCB Design Create a hub for all components
Use a multiplexer to minimize connections
Create headers for each module
Provide power to each module

6. Touch Screen Communicates over SPI bus
Displays UI with tool data, user data
Touch screen was intended to allow user locking and adding users

7. Smart Pads & Contacts Used to determine if a tool is in the drawer
Uses layers of foam and a push button
Wired to contacts behind the drawers
Actuates at 15g

10. Card Reader Verifies user credentials USB Card Reader
USB Host Shield (USB -> SPI)
Issues
Didn’t work on ATmega324PA
Works on Arduino

11. Servo Measured required servo strength
Servo operates through pulse train
Pulse width determines final position of servo
Servo automatically locks drawers after use

12. Shroud and Mounting
Allows manual key entry into the chest in case of failure
Prevents access to electrical components
Contains all modules except the card reader
Provides mount point for the LCD

13. Software Chip not supported by Arduino IDE, needed to remap pins
Initially intended to use interrupts for touch
Polling was sufficient for our application
Uses two arrays, tools and users, to store data
Operates servo and LCD based on this information

14. Testing Programmer LCD Screen Card Reader Software PCB Smart Pads
Contacts
Servo

15. Conclusion Accomplished most of our goals
Touch inputs, card reader, PCB were not fully completed
Future Work:
Fix touch input bugs
Migrate card reader back to 324PA
Resolve PCB issues