Category: ANAVI Miracle Emitter

Flashing Firmware with Esptool on ANAVI Miracle Emitter with ESP32-C3

ANAVI Miracle Emitter is an open-source gadget designed for 5V addressable LED strips such as NeoPixels. Powered by the XIAO ESP32C3 module, it combines open-source hardware printed circuit board (PCB) with open-source firmware for home automation and lighting control. ANAVI Miracle Emitter was successfully crowdfunded through Crowd Supply on May 29, 2025. All ANAVI Miracle Emitter kits were delivered to the Crowd Supply warehouse by the end of June and Crowd Supply shipped them to backers. Although ANAVI Miracle Emitter supports the popular open source software WLED, out of the box it comes with our open source firmware written as an Arduino sketch. In this article you will learn how to use Esptool to flash the pre-compiled binary release of the default firmware to ANAVI Miracle Emitter. The same knowledge can be applied to other devices with Espressif ESP32C3 Wi-Fi and BLE SoC.

To install firmware, users can rely on Esptool, a versatile Python-based utility developed by Espressif. Esptool enables reading, writing, and erasing flash memory on ESP8266, ESP32, and RISC-V-based chips like ESP32C3. It supports specifying baud rates, memory addresses, and chip types, and can flash both bootloaders and firmware binaries. Compatible with Linux, Windows, and macOS, the source code of Esptool is available at GitHub under the GPLv2 license and is ideal for low-level control over the flashing process via the command line.

Installing Esptool on Ubuntu

Follow the steps below to install Esptool on Ubuntu 2024.04 LTS:

sudo apt update
sudo apt install python3 pipx -y
pipx install esptool
pipx ensurepath

Run Esptool to verify that the installation is successful:

esptool version

Flashing Firmware and Bootloader

Download the precompiled firmware and connect your board via USB-C. Flash both bootloader and firmware using:

esptool.py --chip esp32c3 --port /dev/ttyACM0 --baud 460800 write_flash 0x0 path/to/anavi-miracle-emitter-sw.ino.merged.bin

Updating Only the Firmware

To preserve the bootloader, flash only the firmware:

esptool.py --chip esp32c3 --port /dev/ttyACM0 --baud 460800 write_flash 0x10000 path/to/anavi-miracle-emitter-sw.ino.bin

Stay Connected

If you haven’t already, consider purchasing the ANAVI Miracle Emitter to bring your LED projects to life. If you are interested in using Esptool for older devices with ESP8266 have a look at our previous guide from 2020. For more detailed tutorials and updates, subscribe to the YouTube channel.

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Crowdfunding Success: ANAVI Miracle Emitter Kits Now Shipping to Backers

We are pleased to announce that all ANAVI Miracle Emitter kits have been successfully shipped to the Crowd Supply warehouse. Our crowdfunding campaign concluded successfully on May 29, 2025. Over the coming weeks, all backer orders will be processed through Crowd Supply’s fulfillment system and prepared for final delivery.

ANAVI Miracle Emitter is a compact, open-source Wi-Fi and Bluetooth development board, powered by the ESP32-C3 microcontroller running at 160 MHz with a RISC-V architecture. Designed for controlling addressable 5 V LED strips such as NeoPixels, it supports power input via the onboard USB Type-C port or an external power source.

Each kit is thoughtfully packaged in an eco-friendly cardboard box made from recycled materials, reflecting our ongoing commitment to sustainability and responsible packaging.

Thank you for supporting our open-source projects! If you haven’t yet ordered an ANAVI Miracle Emitter, there is still time: availability will continue through Crowd Supply. Over the time we will try to provide it also through other distribution channels. Stay tuned for more technical updates, and we hope you have a fantastic experience with your new ANAVI Miracle Emitter kit!

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ANAVI Miracle Emitter Successfully Funded on Crowd Supply!

We are thrilled to announce the successful completion of our crowdfunding campaign at Crowd Supply for the ANAVI Miracle Emitter, which wrapped up on May 29th 2025. Your enthusiastic support made this possible – thank you! Backers from across seven different countries came together to champion this open-source development board designed for controlling NeoPixel LEDs, featuring the ESP32-C3 chip built on the open architecture RISC-V.

We’re happy to report that the project is progressing smoothly. All printed circuit boards have been produced and assembled, and the custom laser-cut acrylic cases are ready. We have also secured environmentally friendly packaging materials, including recyclable cardboard boxes and a fresh batch of stickers to add some flair.

On the software side, version 1.0.1 of the default open-source firmware that works with Home Assistant over MQTT is now live and will be pre-installed on each unit. As always, the board’s fully open design means you can install alternatives like WLED or create your own custom firmware as you see fit.

In the coming days, we will complete the final packaging and deliver everything to the Crowd Supply warehouse in the US. Shipping to backers will begin shortly afterward, and your kits will be on their way!

We are incredibly grateful for your continued support, input, and engagement with our open-source GitHub repositories. More exciting news and updates are just around the corner so stay connected!

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How To Install WLED on an ESP32 Board from Chrome Web Browser? Example with ANAVI Miracle Emitter and XIAO ESP32C3

WLED is a powerful open-source firmware designed for controlling addressable LED strips, including NeoPixel LEDs like WS2811, WS2812B, TM1809, and more. It supports ESP32 and ESP8266 devices, making it a go-to solution for DIY lighting projects. WLED runs a local HTTP server with a sleek, modern UI, allowing you to control your LEDs easily from any device on the same network. It also integrates seamlessly with Home Assistant, enabling smart home automation, voice control, and advanced lighting effects.

In this tutorial, you will learn the exact steps to install WLED directly from a web browser onto an ESP32 board—no additional software required. The demonstration uses Google Chrome and the ANAVI Miracle Emitter, featuring the XIAO ESP32C3 RISC-V microcontroller. To install WLED from a web browser, visit: https://install.wled.me/.

ANAVI Miracle Emitter is an open-source hardware IoT development board for controlling NeoPixel LEDs. Furthermore, it supports various I2C sensors and a mini OLED display. I designed the printed circuit board (PCB) using the popular open-source software KiCad. It will soon be available through a crowdfunding campaign on Crowd Supply.

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