Quantity   Component name
1 × Honeywell HLC2705-001 Quadrature encoder IC
1 × Honeywell SEP8706-002 Infrared emitting diode
1 × Teensy LC Arduino compatible microcontroller
2 × Microtivity IM206 Tact Switch Momentary Pushbutton
1 × SSD1306 OLED Module
1 × Protoboard
1 × 6-12 ft Tape Measure To extract spring steel for retracting mechanism
1 × Enclosure Currently 3D printable
1 × 4 AAA Battery Holder
4 × AAA Batteries Disposable or rechargeable
1 × 600 Ohm resistor For SEP8706 infrared diode
2 × Pull Down Resistors For pushbuttons
20 × A bunch of breadboard wire