AlarmClock

Alarm Clock

An Alarm Clock created as a school project.

Hardware (general)

Uses an Arduino Uno (atmega328p) as the processor to control:

• 6x 7-segment digits for hours, minutes, and seconds
• 1x character LCD
• 1x snooze button (key switch)
• 1x rotary encoder to adjust time and change other settings (as seen on the LCD)
• 1x piezo buzzer
• 1x real time clock

Shift registers

Because the Uno only has ~19 available pins, I used serial-in parallel-out buffered shift registers to send one bit at a time and release 8 bits all at once. Each shift register typically needs 2 pins at minimum (one for serial in and one for clock), however, for the seven segment displays I cut that down to 1 per and 1 total for an amortized 7 pins in total where all shift registers share one clock pulse.

Software

All software is written in Rust with Rahix's Arduino HAL crate.

Design

TODO!!!

Progress

• Design schematic (done: 2023-09-17)
• Order parts
• Breadboard / POC (in progress)
• Design PCB
• Order PCB parts
• Finish software (in progress)
• Construct case
• Integration