Budget & Reference

Budget

Item/Parts	Quantity	Total (USD)
Relays	5	13.51
Raspberry Pi Pico	2	14.71
AA battery holder	10	8.63
DS1841 log digital potentiometer	5	29.75
DS3502 digital potentiometer	5	24.75
STEMMA QT connector	5	5.70
		97.05

As for other parts (RPi, Arduino, Cable, Power supply, breadboard, jumper cable, etc.) we either borrowed from the lab or bring it from home.

Reference + Acknowledgements

Data sheets

• Adafruit DS3502 I2C Digital 10K Potentiometer Breakout
• Adafruit DS1841 I2C Logarithmic Resistor
• PiTFT Plus Assembled 320x240 2.8" TFT + Resistive Touchscreen
• Raspberry Pi 4
• Arduino Nano 33 BLE Sense

Tutorials/Other projects

• "oMIDItone" by Tim Anderson. We had benefited a lot from this project! Huge thanks to the author!
• "Super Otamatone" by Evan. Some inspirations from this project
• "Auto Otamatone" by Joey Buiteweg. We took a look at this project but decided not to go with moving parts
• Cornell ECE 5725 Lab manuals (Fall 2022) by Dr. Skovira
• Answers in this stackoverflow post on how to get the fundamental frequency in FFT
• FFT on Arduino
• How to do HPS
• Serial read/write with RPi
• Frequency of music notes
• Otamatone Teardown! by Tomorrow Lab

Also huge thanks to the course instructor (Joseph Skovira) and course staff members!