Le'Fob

Overview

Le’Fob is a four button bluetooth remote designed to act as a key fob or integrated into other button interface designs. Using the BTHome spec, Le’Fob presents its buttons and telemetry in Home Assistant allowing you to build automations against press, double-press, triple-press, long-press, & hold gestures for each button.

Currently have proof of concept hardware with LLM assisted firmware builds proving concept. Join our discord to see if you can get your hands on test hardware.

Le’Fob is a sister board to the upcoming Le’Dongle which will have similar hardware, but designed for running addressable LEDs with USB-C PD. Other Le’Dev boards will explore ways to maintain basic home automation in spaces where a whole network doesn’t make sense.

Specs

• CH592 RISC-V BLE
• 4x Button interface
  • WS2812-V6 per button
• USB-C Battery Charging
  • Configurable over I2C
• Battery Fuel gauge (not implemented yet)
• 2x N-Mos Controlled LED Flashlight
  • alternately replace with brighter LEDs
  • alternately replace with IR LED
• Experimental: I2C OLED Header - More to come

Tasks

Hardware

• Validate Base hardware ✅ 2026-09-16
• Add Fuel Gauge
• Remove NTC
• Reverse silkscreen button numbers
• [ ]

Firmware

• BTHome Buttons basic firmware ✅ 2026-09-16
• Encryption
• Configuration Channel
• Web Configurator Basic
• Le’Configurator
• Response Chirps
• Other protocols
• custom integration and format?

Changelog

• 2026.8 - First run notes:
  • confirmed ~30µA deep sleep current
    • ~10mA peak chirp
  • Reverse silkscreen button numbers
    • Aligns top to bottom with Home Assistant
  • Add Fuel gauge
    • remove direct shunt
  • Remove NTC - avoid all voltage dividers for deep sleep