Blog - myembeddedstuff.com

Serverless e-Ink Photo Frame: Using Google Drive for unlimited storage

f you want to build your own e-Ink Photo Frame but want to forget about setting up local servers (Raspberry Pi, NAS, or Home Assistant) and don't want to rely on SD cards, this project is for you.The biggest hurdle when using e-Ink displays for photos is the infrastructure. Normally, you need a 24/7 dedicated server to process the images or pay for third-party services. Additionally, microcontrollers like the ESP32 face two critical constraints: Processing: Running a dithering algorithm (to adapt a real photo to the screen's limited color palette) is too heavy for an ESP32. Memory: High-quality images consume too much RAM during HTTP requests, often leading to crashes or overflow errors. To solve this, I decided to use Google Drive as…

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March 12, 2026

EINK / Project

CHEAPEST DIY E-PAPER PICTURE FRAME. IKEA HACK

Digital e-paper frames have become very popular lately. They are the perfect addition to any desk or living room, but when I looked into buying one, the prices seemed completely out of orbit. We’re talking about extremely high prices for what they actually offer. I preferred to find a way to build my own: customizable and, above all, much more affordable and, why not, based on an IKEA frame that costs just a few euros.I found the 13.3-inch Spectra displays with support for up to 6 colors. While researching suppliers, I came across the XIAO ePaper DIY (EE02) kit from Seeed Studio. What’s interesting about this kit is that, besides the panel, it includes a controller board with everything you need to get…

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February 5, 2026

Project

How to Create a Custom RP2350 Magic Ball (Elon Musk Edition)

Over the last few weeks, I’ve been experimenting with round LCD displays to see what they can really do. The moment I held one in my hand, I had a total Toy Story flashback: Woody asking the Magic 8-Ball for advice.I never actually owned one as a kid, so I thought... why not build my own? But let's take it a step further. Instead of the classic cryptic answers, why not get advice from Elon Musk, Clint Eastwood, or your favorite celebrity? That’s how the RP2350 Magic Ball project was bornFor those who don't know, the Magic Ball was invented in 1946. It is a ball with the appearance of a billiard ball containing an icosahedron floating in liquid. This icosahedron has answers…

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January 27, 2026

ArduinoUnoQ

Arduino Uno Q: The Truth About its Boot-Up Performance

I’d seen a lot of conflicting info on various forums about the Arduino Uno Q's boot time. I decided to stop guessing and test it myself using my own setup to see exactly how long it takes from power-on until the first instruction of a sketch actually executes.In this article, I analyze the startup performance of the Arduino Uno Q boot. I’ll be measuring exactly how long it takes for the MCU sketch and the MPU Python script to execute from the moment the board receives power.Unlike theoretical analyses, I am using external signals and a logic analyzer to pinpoint when each processor begins execution and determine whether they start simultaneously.Specifically, I aim to answer: Does the MCU sketch start automatically? How long does…

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January 14, 2026

ArduinoUnoQ

Arduino Uno Q Communication: A Deep Dive into RPC

The communication system The Arduino Uno Q features a specialized communication method designed to handle data exchange between the MPU and the MCU. This system is based on RPC (Remote Procedure Call). In this post, we will explore the architecture, the protocol, and a hands-on example of how to send and receive commands. We'll even dive into a logic analyzer capture to see exactly how it works under the hood. Before proceeding with this post, I strongly recommend reading my previous review of the Arduino Uno Q: https://myembeddedstuff.com/arduino-uno-q-new-paradigm-review RPC Description Communication is based on RPC (Remote Procedure Call). This system operates like a sort of Router, hosted on the MPU as a service called Arduino-Router. It is responsible for creating and managing a connection table. This…

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January 8, 2026

ArduinoUnoQ

Arduino Uno Q: A New Paradigm.

The new Arduino Uno Q marks a turning point for Arduino's product line following its acquisition by Qualcomm. In this post, I will discuss why this board is so significant, what it is composed of, and future lines. Description Following Qualcomm's acquisition of Arduino, we have seen a shift in their designs. The new Arduino Uno Q maintains the original Uno form factor, but its internal components are completely different: the famous ATmega chips have been left behind in favor of a totally new architecture. Architecture They have opted to assemble a high-performance MPU chip, the Qualcomm Dragonwing QRB2210, alongside a MCU the STM32U585 microcontroller. This brings it closer to the concept of an SBC (Single Board Computer), allowing the MPU to run…

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January 3, 2026

EINK

Beyond 6 Colors: Exploring Dithering on Spectra 6-color E-Ink Displays

I have tested the XIAO ePaper DIY Kit (ESP32-S3) - EE04 from Seeed Studio in depth. While its 6-color Spectra 6 display is impressive out of the box, I wanted to see if software could overcome hardware limitations. In this post, I’ll share how I’ve pushed this hardware to its limits by using dithering techniques to simulate an entirely new range of color tones and shades. This post is divided into the following sections: Hardware Analysis How SPECTRA 6 E-INK Works The Challenge of SPECTRA 6 Conclusion Hardware Analysis The hardware is composed of two elements. The first one is the controller board. It features several push buttons, an ON/OFF switch and a charging circuit to power the device via battery and charge…

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December 30, 2025

Project

Project: Developing an E-Paper Dashboard with Arduino and the reTerminal E1001 (Step-by-Step Guide)

Thanks to the good reception of the previous post, where I described my project of an e-ink dashboard to visualize events and weather using the E1001 terminal from SeeedStudio, in this guide, I will explain step-by-step how to flash your own customized terminal. Additionally, I'll leave a few links in case you haven't acquired the terminal yet. LINK: [https://s.click.aliexpress.com/e/_c39JPkAd] [https://www.seeedstudio.com/reTerminal-E1001-p-6534.html?sensecap_affiliate=roDgS6q&referring_service=link] SeeedStudio link with discount applied at the end. If you haven't seen my previous post, I recommend reading it: I explain good design practices that can be very useful for future embedded systems engineering projects. https://myembeddedstuff.com/dashboard-arduino-e1001 1. Installing the Arduino IDE We need the IDE to compile the code and adapt it to your Google Calendar, location, and other parameters. Guide and download…

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December 15, 2025

Project

Project: Developing an E-Paper Dashboard with Arduino and the reTerminal E1001

I've always wanted a device at home for a long time that would let me see at a glance, every morning while I have my coffee, what I need: the weather, my upcoming events, and some sensor data. I tried several solutions until I discovered a device that was perfect for this purpose. It saved me a lot of time in hardware development and was fully customizable to suit my needs. I'd like to share the development of my small project using the reTerminal E1001 e-paper display hardware from Seeed Studio. In this post, I will discuss the display's hardware, how I used the Arduino IDE to program it, the architectural schematic I followed, and the tools I used for the graphical design. I…

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December 8, 2025

Tools

How to measure RF Power with AD8319 RF Meter and Attenuators

IntroductionThe RF power meter is the key tool for calibration and quality control in my radio frequency projects.When working with RF equipment, we often need to know the output power of our system. This serves multiple purposes: from validating the state of the output to confirming that the transmission power is within a valid range (useful if we have to perform certification processes, for example).I arrived at this solution after analyzing various RF power measurement systems and finding one that was quite economical, functional, and very simple (without the need for any desktop applications).First, it's important to understand how RF system power measurement works. It's usually measured in Watts and indicates the amount of energy being transmitted/received per unit of time (1 W…

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December 1, 2025