You can build a wearable AI device that talks to Claude for under $15 in parts. No 3D printing. No soldering iron required for the basic version. Just 5 components and a USB cable.
Here's exactly what you need and where to buy it.
The $15 Parts List
| Part | Function | Price | Where to Buy |
|---|---|---|---|
| ESP32-S3 DevKitC | Brain (microcomputer) | $4-6 | AliExpress, Amazon |
| SSD1306 0.96" OLED | Display (128x64 pixels) | $1.50-2.50 | AliExpress, Shopee |
| INMP441 I2S Mic | Voice input (digital) | $1.50-2 | AliExpress |
| MAX98357A I2S Amp + Speaker | Audio output | $2-3 | AliExpress |
| Breadboard + Jumper Wires | Connections | $2-3 | Amazon, AliExpress |
Total: ~$12-17 USD
Why ESP32-S3 Specifically?
Don't buy the ESP32-C3 or ESP32-S2. Their memory is too small for AI functions.
The S3 has:
- Built-in USB (plug directly into computer, no programmer needed)
- 8MB flash + 512KB SRAM (plenty for our code)
- Native I2S support (digital audio without extra converters)
- WiFi + Bluetooth built in
- Dual-core processor
For $5, you get a computer that can call Claude's API, display responses on a screen, and understand voice commands.
The OLED Screen (SSD1306)
This tiny 0.96" screen only needs 4 wires: VCC, GND, SDA, SCL.
Key specs:
- 128x64 pixels (enough for 8 lines of text)
- I2C protocol (simplest wiring possible)
- ~20mA power draw (battery-friendly)
- Massive software library support
Warning: When buying, check the pin order. Some modules have VCC and GND swapped. Look at the silk screen printing before wiring.
The Microphone (INMP441)
Why I2S instead of analog?
- Digital signal = no extra ADC needed
- Better sound quality
- Fewer wires
- Native ESP32-S3 support
If you only want text interaction (no voice), you can skip this part.
What You'll Build
By the end of a weekend project, you'll have:
- An ESP32 that connects to WiFi
- Sends your question to Claude API
- Displays the answer on the OLED screen
- (Optional) Voice input and audio output
The total cost is less than one month of a ChatGPT subscription. And you own the hardware forever.
Getting Started
The wiring is straightforward — 4 wires for the screen, 3 wires for the mic, and power. No soldering needed if you use a breadboard.
The complete step-by-step build guide, including all the code (MicroPython), wiring diagrams, and troubleshooting for common errors, is in our ESP32 + Claude wearable guide.
Get the complete build guide: Claude Code on Wearables — 8 chapters from parts list to working prototype.
Also useful: AI Affordable Wearables Guide — covers the full landscape of AI wearable devices you can build in 2026.
Have you built anything with ESP32? Share your project in the comments.
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