TossTalk

TossTalk is a tossable wireless microphone built on the M5StickC Plus2.

Power it on, pair it, and pass it around whenever a group needs one shared mic.

Build guide: TossTalk on Instructables

What it does

• Detects when the device is in the air and mutes throw noise
• Recovers quickly so the next speaker can talk right after catching it
• Streams audio to a web app over BLE
• Plays audio through connected speakers
• Shows remaining battery on the device screen
• Supports browser-based firmware updates without the Arduino IDE

Quick start

1. Power on TossTalk
2. Open the TossTalk web page in Chrome or Edge (desktop) at kevinl95.github.io/TossTalk
3. Connect the device
4. Pass or toss the mic to whoever needs to speak

Normal reconnect and recovery are automatic.

Firmware updates (easy path)

The web app includes a Flash Firmware button that uses Web Serial in Chromium browsers.

By default, it flashes a prebuilt merged image hosted with the site:

• web/firmware/tosstalk-merged.bin

This file is generated automatically by GitHub Actions during deployment.

Browser support

• Target: Desktop Chromium browsers (Chrome, Edge)
• Mobile browsers: not currently in scope

Project structure

• firmware: Device firmware (PlatformIO)
• web: Browser app (PWA + Web Bluetooth + Web Serial flashing)
• docs: Architecture, protocol, milestones, test notes
• .github/workflows: Build and deployment automation

For developers

Local firmware build

1. Open firmware/platformio.ini
2. Build/upload with PlatformIO

Local web testing

Serve web with any static server and open in desktop Chromium.

Deployment

Push to main to:

• deploy the web app to GitHub Pages
• build firmware
• publish updated merged firmware for browser flashing