Pi Pico 2 Real-Time Audio Spectrum
Raspberry Pi Pico 2 Real-Time Audio Spectrum Analyzer Kit
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Transform a Raspberry Pi Pico 2 into a high-speed audio spectrum analyzer that captures live sound via an I2S digital microphone, processes an FFT through the PIO state machines, and paints the frequency spectrum on a 1.8-inch TFT display — all in real time. This advanced DSP kit turns a breadboard into a lab-grade signal visualization tool, perfect for engineering students exploring firmware-level audio processing. The result is a compact, hackable instrument that lets you see the spectral signature of any sound.
What You'll Build
You’ll assemble a complete real-time spectrum analyzer: the INMP441 I2S MEMS microphone captures audio at 22 kHz sample rate, the Pi Pico 2’s PIO programmable I/O handles bit-banging I2S without CPU intervention, and an optimized FFT algorithm computes frequency magnitudes on the fly. The live spectrum scrolls on the ST7735 color TFT, displaying bass through treble bands. With the finished project, you can plug in, watch any sound’s fingerprint, and tweak the code to explore windowing, decibel scaling, or peak hold.
What You'll Learn
- Implement I2S audio input using the INMP441 mic and Pico 2 PIO state machines — no external codec required
- Code a fixed-point FFT in C/C++ for the Raspberry Pi Pico 2 SDK, optimizing for speed and memory on the RP2350
- Drive an ST7735 TFT display over SPI, mapping magnitude bins to colorful bar graphs in real time
- Debug real-time constraints and DMA/PIO timing to maintain 22 kHz continuous sampling without dropped frames
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi Pico 2 | 1 |
| INMP441 I2S Mic | 1 |
| 1.8in TFT ST7735 | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Capacitors | 5 |
| 400-pt Breadboard | 1 |
| M-M Jumper Wires | 20 |
| Micro USB Cable | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This kit is designed for third-year B.Tech ECE/EEE students who want to go beyond Arduino tone projects and master the Raspberry Pi Pico 2’s PIO for serious DSP. It is also ideal for Smart India Hackathon teams prototyping audio-based analytics, and for IIT/NIT/VIT Makerspaces running embedded systems workshops. Even a motivated CBSE Class 12 student with C programming experience can follow the AI companion’s guidance.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Our AI companion offers real-time debugging tips; you can also send a WhatsApp message for human help within 24 hours.
Do I need a logic analyzer to debug the I2S PIO?
No, the kit includes pre-verified PIO code that runs out of the box. The AI companion will walk you through verifying signals if you want to probe deeper.
Can I modify the FFT to use more points or show a waterfall display?
Yes, the source code is open. The AI companion can guide you to increase FFT size up to 1024 points or implement a scrolling waterfall on the TFT.
Is the kit compatible with the original Raspberry Pi Pico?
The kit leverages RP2350-specific capabilities; the original Pico lacks the necessary PIO channels and processing speed for 22 kHz real-time FFT. Only the Pi Pico 2 is included.
Pi Pico 2 PIO samples audio via I2S INMP441 at 22kHz. FFT spectrum rendered on 1.8in TFT in real time.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items