For a long time, there was a gap between playing with an Arduino and doing professional embedded engineering. It changed with the upgrade from Arduino Uno R3 to Arduino Uno R4, when 8-bit ATMega was replaced with a powerful Renesas RA4M1 (ARM Cortex-M4).
Mastering the ARM Cortex-M4 (using Arduino R4)
The goal of this series is to treat the Uno R4 not as a simple hobbyist board, but as a professional evaluation kit for the ARM architecture. If you stay curious and explore what’s happening under the hood, this hardware becomes a gateway to the same technology found in medical devices, automotive systems, and industrial robots.
In this series, we go beyond the beginner-friendly Arduino layer to work like real embedded engineers. We will cover:
- Reading Datasheets: Configuring peripherals by writing directly to registers.
- Professional Toolchains: Moving from the IDE to CLI, Makefiles, and modern build systems.
- System Architecture: Using an RTOS and professional CI/CD workflows.
Note: While we use the Arduino hardware for its accessibility, it is important to understand its limitations in professional products. For more context, check out these discussions on Is there anything wrong with Arduino?, Why engineers hate Arduino?, and most important, a very clear explanation why you shouldn’t use Arduino for professional work.
This series treats the Uno R4 not as a simple board, but as a professional evaluation kit for the ARM architecture.
Who is this for?
This series is for developers and hobbyists who are tired of treating their hardware as a “black box”. If you’ve been using the Arduino API to get things working but feel like you’re missing what’s actually happening underneath — how the code gets compiled, how it lands on the chip, how the hardware really works — this series is for you.
It will be perfect if you have an Arduino UNO R4 WiFi or Minima.
My setup
- Arduino UNO R4 WiFi board (Renesas RA4M1)
- Arduino IDE 2.3.6
- Ubuntu 24.04
If you’re using a different IDE version or operating system — some details may just look a little different on your setup.
Published posts
The posts in this series published so far:
- Understanding the Arduino build process: from a sketch to a binary
- Arduino CLI guide: advanced compilation, automation, and makefiles
- Blinking an LED on Arduino Uno R4 using direct register access
- Adding CI/CD to Arduino projects: Github Actions and Wokwi simulation
- Running Zephyr RTOS on Arduino UNO R4 WiFi
More posts coming soon!
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