Spectrum Analyzer Kit

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Reads a microphone through the ADC, runs an FFT, and shows a live frequency spectrum on an OLED. It has since grown into its own book.

Source book: Learning MicroPython
Kit page: https://dmccreary.github.io/learning-micropython/kits/spectrum-analyzer/
Printable one-pager: spectrum-analyzer-one-pager.html

Features

• Uses the Raspberry Pi Pico RP2040

Benefits

• Free, open lessons: the Learning MicroPython textbook has the kit page, wiring, and MicroPython code.
• Classroom friendly: built on a solderless breadboard or no-solder connectors.
• Budget: about $14 (MAX4466 microphone about $1, 0.96" OLED about $4.40; Pico $4, breadboard $2, wires $1, USB cable $2).

Parts

• Raspberry Pi Pico ($4) — Microcontroller
• 830-Point Breadboard ($1.10) — Breadboard
• Micro-USB Data Cable ($2.50) — Power and programming cable