Automatic Floor Light

A smart light bar — illuminates dark places on-demand by gently powering-up/down a LED stripe depending on the ambient light level and a detected human presence.

Hardware core is a ESP32-H2 SoC connected with an VEML7700 ambient light sensor and a small but effective LD2410 radar based presence sensor. This automatic floor light is completely self-contained.

It does not use Wifi or Zigbee features of the ESP32-H2 SoC and does not connect to a smart home system with that firmware here - but one may add such a feature smoothly, of course.

Status:

• Software: ready, tested
• Hardware: alpha, testing and improving in progress

Sketch

Hardware

The wiring diagram includes a separate programming board (on the left side), which is can be connected to the main unit via a 5-pin connector. It's required to flash the ESP32-H2 once it's soldered. The programming board connects to a computer or any other suitable programming environment via a standard USB-C connector. Please note, that this programming board is not required in a scenario, when one has it's own way of initial flashing the SoC before soldering and don't wish to update the firmware later.

Parts

Notes on used components

Software

Complete program code is included here. In order to build it and flash the ESP32-H2 one needs a ESP32 Rust embedded toolchain.

We are going to use an ESP32-H2 SoC with Rust embedded Toolchain with [std]. For that and this project we need:

• Rust compiler (see www.rust-lang.org)
• Rust embedded toolchain for ESP32-H2 for projects using std lib Follow the instructions for [std] projects in this book chapter: The Rust on ESP Book - Setting Up a Development Environment Notes on this: - ignore sections for [no_std] - When it comes to the step espup install, you should consider using espup install --targets esp32h2 instead, to avoid installing lots of unnecessary dependencies for unused Espressif targets.
• cargo build

To flash the ESP:

• cargo run

Terms & Conditions

Feel free to use anything here for learning, to build your own version or make a product out of it and sell it. In case you find it useful, the author would be delighted to notice a small donation in Solana coins to FTMfeKYhpVAouuwXjpJXhnT13fkeNJqQsRGMBxBo1GML.

bitmagier, March 2024