Quantity   Component name
1 × Trinket Pro http://store.hackaday.com/products/trinket-pro-with-black-solder-mask-and-the-hackaday-io-logo
1 × EVQ-WK4001 Transducers and Encoders / Encoders
1 × SPST Switch Power Switch
2 × 0.068uF Ceramic Capacitor For Low Pass Filter
2 × 0.033uF Ceramic Capacitor For Low Pass Filter
4 × 820 Ohm Resistor For Low Pass Filter
2 × 4k7 Ohm Resistor I2C pullup resistors
1 × 10 Position IDC Header For outputs
1 × LM348 Operational Amplifier for Low Pass Filter
1 × 0.96" OLED I2C Display https://www.tindie.com/products/miker/096-oled-i2c-display-33v-50v/
1 × 9V Battery Clip
1 × 9V Battery