Quantity   Component name
1 × ATtiny85 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × 0.96" 128x64px OLED
1 × CR2032 holder (or according to chosen power source) Batteries and Battery Accessories / Batteries
2 × Neodymium Nickel / uncoated magnets. ideally with counterbore
2 × Screws and other mounting material to tightly fit the magnets
1 × Perfboard
1 × 8.0MHz or 8.192MHz crystal
1 × Tacticle switch (closing)
1 × ISP header
1 × 10kOhm resistor
1 × 1000uF capacitor
2 × 22pF capacitor (or whichever suits your crystal)
1 × 100nF capacitor
1 × CR2032 coin cell (or other 3V source) Batteries and Battery Accessories / Batteries