The code is running on a XIAO nRF52840 Sense board using Zephyr RTOS (VS Code with nRF-Connect). It is my first Zephyr project, so still learning.

• Peripherals:
• Addressable LEDs (4x35) as one strip
• 5 different countdown animations 
• Accelerometer for hour glass trigger
• Servo (PWM)
• (Microphone for future use)

The LED animations are running in the main thread, the Servo control and timing for the alarm mechanism is in a separate thread triggered when the 1 minute is left.

Sourcecode: https://gitlab.com/maketvee/ltt_zephyr

I used some pixel art tools to test animations and also generated tome GIFs for my Lightning talk about the timer at HdE.