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kitchen timer

Here’s the bill of materials I ended up with:
Teensy 2.0

Adafruit 16x9 Charlieplexed PWM LED Matrix Driver
LED Charlieplexed Matrix - 9x16 LEDs - Warm White

Rotary Encoder
Solid Machined Metal Knob

PowerBoost 500 Charger
Lithium Ion Polymer Battery - 3.7v 2500mAh

Mini Magnet Feet for RGB LED Matrices
Piezo Buzzer

I supplemented some additional fasteners to screw into the mini magnet feet from the front clamping the case layers together.”

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