ANAVI Technology

ANAVI I2C TPM 2.0 Is Coming Soon to Crowd Supply

We are excited to announce that ANAVI I2C TPM 2.0 is coming soon to Crowd Supply! This compact open-source hardware add-on brings hardware-based TPM 2.0 security to Raspberry Pi single-board computers while using the I2C bus.

Following the successful launch of our original ANAVI TPM 2.0, which connects to Raspberry Pi over SPI, the new I2C version was developed in response to requests from the community. It provides the same goal: bringing a hardware root of trust to Raspberry Pi projects, but in a smaller form factor and with a different interface thanks to the Infineon Optiga SLB 9673 TPM 2.0 chip.

Hardware security for Raspberry Pi

TPM 2.0 is an industry standard for hardware-based security. It can securely manage cryptographic keys and support applications such as disk encryption, device authentication, digital signatures, measured boot, and hardware-generated randomness.

ANAVI I2C TPM 2.0 is built around the Infineon OPTIGA SLB 9673 TPM 2.0 and is designed to make these capabilities accessible to Raspberry Pi developers, makers, and professionals.

The board works with all Raspberry Pi single-board computers and uses only five pins on the 40-pin GPIO header: pins 1, 3, 5, 7, and 9. That leaves the rest of the GPIO header available for other hardware. It measures just 16.5 × 12.8 mm, making it particularly attractive for compact projects and custom designs.

Like our other hardware, ANAVI I2C TPM 2.0 is open source. The PCB is designed with KiCad, and the hardware design is available under the CC BY-SA 4.0 license. Version 1.1 has also received Open Source Hardware Association certification under OSHWA UID BG000154.

I2C vs. SPI: Which ANAVI TPM 2.0 is right for you?

Both ANAVI TPM 2.0 boards provide TPM 2.0 security for Raspberry Pi, but their interfaces and physical layouts are different.

	ANAVI I2C TPM 2.0	ANAVI TPM 2.0 (SPI)
TPM 2.0 chip	Infineon OPTIGA SLB 9673	Infineon OPTIGA SLB 9672
Interface	I2C	SPI
Header pins	5	10 (2×5)
Pins	1, 3, 5, 7, 9	17 to 26
Dimensions	16.5 x 12.8mm (0.65 x 0.51 inches)	18.4 x 12.9 mm (0.72 x 0.51 in)
Mounting	Horizontal or vertical	Horizontal or vertical
Micro mounting holes	2	1
Raspberry Pi compatibility	All Raspberry Pi SBCs	All Raspberry Pi SBCs
Open source hardware	Yes	Yes

The original ANAVI TPM 2.0 uses the SPI bus and occupies ten pins on the Raspberry Pi header. It is already available through Crowd Supply following a successfully funded campaign.

The new ANAVI I2C TPM 2.0 takes a different approach. By using I2C and only five header pins, it leaves more of the Raspberry Pi GPIO header available and achieves an even more compact footprint. This can be especially useful when building custom hardware, working with other GPIO peripherals, or designing an enclosure where every millimeter matters.

Both boards are available in horizontal and vertical configurations, allowing you to choose the orientation that best fits your Raspberry Pi setup. ANAVI I2C TPM 2.0 has two micro mounting holes while ANAVI TPM 2.0 (SPI) has only one.

Designed for open-source projects

ANAVI I2C TPM 2.0 combines open-source hardware with free and open-source software. It is compatible with the tpm-slb9673.dtbo device-tree overlay included in the official Raspberry Pi Linux kernel, helping integrate the TPM with Raspberry Pi OS and other GNU/Linux distributions.

Whether you’re building a secure home server, experimenting with trusted computing, protecting cryptographic keys, or developing a custom Raspberry Pi product, ANAVI I2C TPM 2.0 provides a compact hardware security building block.

Coming soon to Crowd Supply

Thank you for supporting open-source hardware and for helping us make Raspberry Pi projects more secure: one board at a time! ANAVI I2C TPM 2.0 is coming soon to Crowd Supply. The campaign has not launched yet, but you can already sign up on the project page to receive notifications.

Subscribe now to be the first to know when we launch the campaign!

Forking Open Source Hardware Right: The ANAVI Macro Pad 10 and the Rise of MATOSIC MACROPAD

ANAVI Macro Pad 10 is our programmable keypad with 9 mechanical switches and a rotary encoder built around XIAO module with Raspberry Pi RP2040 microcontroller. ANAVI Macro Pad 10 was crowdfunded through Crowd Supply on November 7, 2022 and it is now available at Crowd Supply, Mouser and Lectronz. It illustrates how open hardware can act as a reusable foundation rather than a fixed product. Released under the permissive license Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0), ANAVI Macro Pad 10 allows others to study, modify, and fork the design while keeping attribution and share-alike requirements intact. That structure makes it easy for developers to adapt the device for different workflows without starting from scratch.

A recent fork is the MATOSIC MACROPAD, created by Hrvoje Matosic in Mexico City. It reworks the original design of ANAVI Macro Pad 10 into a compact macropad aimed at developers using AI-assisted coding tools. What makes this case interesting is not just the fork itself, but how naturally it extends the original design’s intent. The ANAVI Macro Pad 10 was never locked to a single use case, which makes it flexible enough to evolve into tools for new computing trends like AI-driven development workflows. This kind of reuse is exactly what open hardware licensing is meant to enable.

The project has also been certified by the Open Source Hardware Association with UID MX000040 on June 05, 2026, marking it as an officially recognized open hardware derivative from Mexico.

ANAVI Macro Pad 10 was also certified by the Open Source Hardware Association with UID BG000093 on January 11, 2023. Hrvoje shared his fork on GitHub. In this context, each derivative project strengthens the original ecosystem. The MATOSIC version does not replace the ANAVI design, it builds on it, showing how small, well-documented devices can become platforms for experimentation and productization.

Overall, the ANAVI Macro Pad 10 demonstrates how open source hardware grows through iteration. Its value is not only in what it is, but in what others can turn it into, from hobby builds to even certified commercial products!

Open Source ANAVI TPM 2.0 for Raspberry Pi Debuts on Crowd Supply

We are excited to announce that the ANAVI TPM 2.0 for Raspberry Pi crowdfunding campaign officially launched yesterday on Crowd Supply. The launch date was carefully selected. March 3 is celebrated as Liberation Day in Bulgaria, a meaningful occasion for us because our hardware is designed and manufactured in Plovdiv, Bulgaria, EU. The same date also marks an important milestone for us, as on March 3, 2017, we introduced ANAVI Infrared pHAT, our first add on board for Raspberry Pi under the ANAVI brand.

ANAVI TPM 2.0 is an open source hardware add on that enhances the security of your Raspberry Pi projects. It supports trusted computing capabilities such as secure cryptographic key management, disk encryption and a hardware random number generator.

Designed for developers, hobbyists, and professionals who require stronger security for Raspberry Pi based solutions, ANAVI TPM 2.0 provides advanced protection in a compact open source form factor. With a symbolic crowdfunding goal of just $1, the campaign aims to bring another ANAVI open source hardware product to life, designed and manufactured in Plovdiv, Bulgaria, European Union, through our established and trusted supply chain.

Thanks to the strong support from our backers, the funding goal was reached within minutes of launch. Place your order now to be among the first to receive ANAVI TPM 2.0!

FOSDEM 2026 is Europe’s Biggest Open Source Conference

This weekend, Brussels is once again the destination for open-source lovers from around the world. FOSDEM 2026 (Free and Open Source Software Developers’ European Meeting) takes place on 31 January and 1 February 2026 at the Université Libre de Bruxelles (ULB) Solbosch Campus in Belgium. It is widely recognised as Europe’s largest open-source conference, bringing together thousands of developers, contributors, and enthusiasts with hundreds of talks, workshops, stands, and community gatherings.

FOSDEM is free to attend and known for its rich programme of devrooms covering everything from Embedded & RISC-V, Open Hardware, Design, EU policy, to Browser & web platform sessions and beyond.

To celebrate FOSDEM and support the open-source hardware community, ANAVI Technology is running a special sale on Lectronz, the relatively new marketplace for makers focused on open-hardware creators and EU customers.

Use the discount code FOSDEM2026 at checkout to enjoy 26% off our open-source hardware products. The code will be valid until 15 Feb 2026. Orders placed during the event period will be shipped after FOSDEM, and customers in the EU can take advantage of Lectronz’s built-in support for hassle-free EU VAT handling.

Exploring ESPHome on WB3S Module with Beken BK7231T Microcontroller and Our New Open Source Breakout Board

ESPHome is an open-source firmware ecosystem that lets you easily control microcontrollers through simple YAML configurations. It is best known for its excellent support for the ESP8266 and ESP32 families, powering countless DIY and smart-home projects. However, ESPHome has also been ported to additional hardware platforms. Exploring one of these alternatives was the motivation behind this small project.

One such alternative is the WB3S, a Tuya Wi-Fi module built around the Beken BK7231T microcontroller. It offers 15 GPIOs (including 6 PWM, 2 UART, and an ADC) and conveniently shares the same footprint as the popular ESP-12 modules based on ESP8266 which you know from ANAVI Thermometer, ANAVI Light Controller and several other of our boards. Thanks to the open-source LibreTiny PlatformIO environment, ESPHome can be built and flashed for WB3S and other Beken-based modules.

As part of this exploration, I designed an open source WB3S breakout board, fully compatible with breadboard prototyping and created in KiCad. In the accompanying demo video and example configuration, I walk through the entire workflow: designing the board, setting up the software environment, compiling the firmware with ESPHome, and flashing it to the module using ltchiptool.

The example ESPHome configuration used in the video is available here. Replace SSID and PASSWORD with your Wi-Fi credentials.

Conclusion

Our new WB3S breakout board is available in GitHub as open hardware for anyone interested in experimenting with the BK7231T and ESPHome. However, while functional, ESPHome support for Beken-based devices still lags far behind the mature and reliable ESP32 ecosystem. For production projects or anything requiring stability, it is highly recommended sticking with ESP32 for now.

Building Smarter Gardens with ANAVI Gardening uHAT and the Yocto Project

If you have ever wanted to turn your Raspberry Pi into a smart gardening assistant, our ANAVI Gardening uHAT is a simple, low-cost way to get started. This open source add-on board makes it easy to monitor and care for your plants with sensors for soil moisture, temperature, humidity, barometric pressure, and light. Best of all, there is no soldering, special tools, or complicated setup. Just plug the board into your Raspberry Pi with your bare hands, follow the user manual, and you are ready to go. First introduced in 2021 through a successful Crowd Supply campaign, the ANAVI Gardening uHAT is now widely available through distributors such as Mouser Electronics. While the official documentation is based on Raspberry Pi Operating System, the board works with any Raspberry Pi single-board computer and any Linux distribution designed for it. This makes the ANAVI Gardening uHAT not just a hobbyist gadget, but also a versatile tool for anyone experimenting with Internet of Things (IoT), agricultural technology, or embedded Linux.

The Yocto Project Meets Raspberry Pi Gardening

In early 2025, Leon Anavi, the creator of the ANAVI Gardening uHAT, launched a new series of video tutorials on the Yocto Project and OpenEmbedded. These tools, maintained under the Linux Foundation, have become the industry standard for building custom Linux distributions for embedded devices.

In episode 10 from September 2025, Leon demonstrates how to enable the Serial Peripheral Interface (SPI) on a Raspberry Pi and use it with the Microchip MCP3002 10-bit analog-to-digital converter (ADC) integrated into the ANAVI Gardening uHAT. This allows you to connect analog sensors, such as a capacitive soil moisture sensor, and read their data in real time.

Step-by-Step: Enabling Serial Peripheral Interface with Yocto

If you want to try the tutorial yourself, here is a simplified version of the steps Leon used in the video. These examples are based on the Yocto Long Term Support (LTS) release Scarthgap and use the meta-raspberrypi board support package (BSP) layer.

Enable Serial Peripheral Interface support
Add the following line to your conf/local.conf: ENABLE_SPI_BUS = "1"
Include required Python packages
Extend your Linux image with the spidev library (used in the examples), plus some helpful tools: IMAGE_INSTALL:append = " python3-spidev"
Build and flash your image
Build the core-image-base, flash it to a microSD card, and boot your Raspberry Pi.
Run Python code to read sensor values
Open a Python 3 interactive shell and use this example code snippet to start reading data from a capacitive soil moisture sensor through the MCP3002 analog-to-digital converter.

Why This Matters

This combination of ANAVI Gardening uHAT and the Yocto Project is more than just a fun do-it-yourself experiment. It is a hands-on way to learn about:

Embedded Linux development
Custom Raspberry Pi distributions
Practical Internet of Things (IoT) applications in agriculture

For hobbyists, it means you can monitor your houseplants or small garden with open source hardware and software. For professionals, it is a chance to explore how Yocto-powered Linux images can streamline development in real-world embedded projects.

ANAVI Info uHAT Used in Yocto Project I²C Tutorial on Raspberry Pi 5

ANAVI Info uHAT is an affordable, open-source Raspberry Pi add-on board that brings extra functionality in a compact form. It features a mini OLED display, three buttons, red and green indicator LEDs, and slots for various sensors. Each kit includes a 0.96″ yellow-blue I²C OLED display with a resolution of 128×64 pixels.

Originally crowdfunded on Crowd Supply in 2022, the board is now available from various distributors, including Mouser. While our documentation is based on Raspberry Pi OS, ANAVI Info uHAT works with any Raspberry Pi computer model and Linux distribution running on Raspberry Pi.

At the start of 2025, Leon Anavi launched a series of video tutorials on the Yocto Project and OpenEmbedded. The Yocto Project, a collaborative initiative under the Linux Foundation, has become the de facto industry standard for creating custom Linux distributions tailored for embedded devices.

In Episode 9 from September 2025, Leon demonstrates how to enable I²C on a Raspberry Pi and use it with an SSD1306 mini OLED display. To simplify wiring, he used the ANAVI Info uHAT, attaching it directly to the Raspberry Pi 5’s 40-pin header, while the OLED display connected to its dedicated I²C port.

Thanks to meta-raspberrypi, a community-maintained Yocto/OpenEmbedded BSP (Board Support Package) layer, enabling I²C and autoloading its Linux kernel modules is as simple as adding two lines to conf/local.conf:

ENABLE_I2C = "1"
KERNEL_MODULE_AUTOLOAD:rpi += "i2c-dev i2c-bcm2708"

The demonstration from the video tutorial also included useful packages in the Yocto image to scan for I²C devices and interact with the SSD1306 OLED display:

IMAGE_INSTALL:append = " i2c-tools ssd1306"

After building core-image-base and booting it on the Raspberry Pi, you can test the OLED using the open-source ssd1306_bin tool. Here are some sample commands from the tutorial:

ssd1306_bin -n 1 -I 128x64
ssd1306_bin -n 1 -c
ssd1306_bin -n 1 -r 0
ssd1306_bin -n 1 -x 1 -y 1
ssd1306_bin -n 1 -l "Hello World"
ssd1306_bin -n 1 -x 1 -y 2
ssd1306_bin -n 1 -l "The Yocto Project"
ssd1306_bin -n 1 -x 1 -y 3
ssd1306_bin -n 1 -l "on Raspberry Pi 5"

This tutorial builds on concepts from previous episodes in the series, so if you are new to the Yocto Project on Raspberry Pi 5, it is highly recommended to start from the beginning. Watching the full video will give you a detailed walkthrough and context for each step.

ANAVI Macro Pad 10 Gets a 3D-Printed Case Upgrade

ANAVI Macro Pad 10 is a compact, open-source, custom-programmable mini keypad that’s as versatile as it is stylish. With nine hot-swappable Gateron red mechanical switches, translucent keycaps, and a rotary encoder with a clickable switch, this little powerhouse is built to boost productivity and personalization.

Its black, gold-plated PCB is loaded with thoughtful design details: yellow backlighting under each key, a front-facing RGB LED, and four WS2812B LEDs for gorgeous under-lighting effects. Thanks to its hot-swappable sockets, switching out mechanical switches is a breeze: no soldering required!

From Plexiglass to 3D Printing

Originally, the Macro Pad 10 shipped with a simple transparent laser-cut plexiglass enclosure. While functional, recently we have a major customer interested in having the keyboard in a more solid case.

As a result we now have a 3D-printed case for ANAVI Macro Pad 10, designed by Pavlin Saksanov, a very skilled engineer with mechanical expertise. The new case is fully compatible with the original plexiglass enclosure and is available as STL and STEP files in the project’s GitHub repository. Like the rest of the design files, it has been shared under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

The 3D printing was brought to life by Experify 3D, a specialized 3D printing company also based in Plovdiv, Bulgaria. Special thanks go out to Samuil Gospodinov, who supported both prototyping and production of the final version. The finished case is printed in black PLA filament imported from Poland. It uses M3x3x5mm threaded inserts, ensuring the case can be assembled and disassembled multiple times without wear or damage. The inserts make the case compatible with M3 16mm DIN 965 screws for secure and reliable assembly. Just like ANAVI Macro Pad 10, the new 3D printed case is also made in Plovdiv, Bulgaria, EU.

Open Source Inside and Out

Like other devices by ANAVI Technology Ltd, the printed circuit board of ANAVI Macro Pad 10 was designed using KiCad, the cross-platform, open-source electronics design automation suite. The keyboard supports both KMK firmware (CircuitPython-based) and QMK firmware, giving users flexibility and control over their setup.

ANAVI Macro Pad 10 wass launched alongside the ANAVI Knob 1 and ANAVI Knobs 3 through a Crowd Supply campaign on November 7, 2022. Today, it remains available through Crowd Supply, as well as distributors like Mouser, The Pi Hut, Tindie, and Lectonz.

Introducing ANAVI TPM 2.0: Trusted Security for Your Raspberry Pi

We are excited to unveil our latest product: ANAVI TPM 2.0, a powerful, open source hardware add-on board that brings industry-standard TPM 2.0 security to Raspberry Pi single board computers.

Built around the Infineon Optiga SLB 9672 chip, ANAVI TPM 2.0 connects to your Raspberry Pi via the SPI on the 40-pin header, making it easy to add hardware-based cryptographic security to your projects. From secure key storage and digital signatures to disk encryption and measured boot, TPM 2.0 enables a wide range of security-critical applications. It even functions as a True Hardware Random Number Generator (TRNG), a crucial feature for any system requiring high-entropy randomness.

Whether you are a developer, engineer or hobbyist, ANAVI TPM 2.0 offers a reliable solution to enhance trust and integrity in your Raspberry Pi setup. To support different use cases, the board will be available in two hardware configurations:

Horizontal version with a standard 2×5 (2.54 mm) female header
Vertical version with a 2×5 (2.54 mm) female header mounted at a 90-degree angle

ANAVI TPM 2.0 will launch soon via a crowdfunding campaign on Crowd Supply, our trusted long-term partner. As usual, we will manufacture the boards in Plovdiv, Bulgaria, EU. Please, subscribe on the Crowd Supply page to be notified when the campaign goes live and be among the first to secure your board!

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.