Arduino Secrets Management with arduino_secrets.h

Getting Started with Arduino arduinoSecrets

Unlocking Arduino's Secrets: A Guide to arduino_secrets.h

Embarking on Arduino projects often involves dealing with sensitive information, from Wi-Fi credentials to API keys. In this guide, we unveil the power of Arduino Secrets Management with the arduino_secrets.h file—a hidden gem in the Arduino world. Discover how this file adds a layer of security to your projects by keeping secrets safe and out of the public eye.

The Purpose of Arduino Secrets Management:

The arduino_secrets.h file serves a crucial role in safeguarding sensitive data used in Arduino sketches. It provides a secure space to store private information such as passwords, API keys, or any other data that you want to keep confidential, preventing unintentional exposure of critical details when sharing or publishing your Arduino code online.

Benefits of Using Arduino Secrets Management:

  • Enhanced Security: Keeping sensitive information in a separate file adds a layer of security, especially when sharing your code with others or publishing it online.

  • Ease of Collaboration: Collaborating on Arduino projects becomes smoother as collaborators can focus on the main sketch without exposing sensitive details.

  • Facilitates Version Control: When using version control systems like Git, the arduino_secrets.h file can be easily ignored, preventing accidental commits of sensitive information.

The arduino_secrets.h file is typically not included in the code repository or shared publicly. Instead, you create a local copy of the file on your development machine and populate it with your specific secret values. This way, you can safely share the main code while keeping the secret data private.

To use arduino_secrets.h, you typically follow these steps:

  1. Create a new tab in the Arduino IDE or your preferred text editor.
  2. Save the new tab with the name arduino_secrets.h.
  3. Define your secret variables and values in the arduino_secrets.h file, for example:
Arduino IDE New Tab
  • Top right of the IDE, click on the three little dots for menu.
Arduino IDE Arduino secrets
  • Save new file as arduino_secrets.h
Arduino IDE Arduino secrets 2
  • Copy and paste the code below to arduino_secrets.h tab and input your own credentials.
#define SECRET_SSID "your_wifi_ssid"
#define SECRET_PASSWORD "your_wifi_password"
#define SECRET_API_KEY "your_api_key"

In your main sketch file, include the arduino_secrets.h file at the top, like this:

#include "arduino_secrets.h"

Now you can reference the secret variables in your main sketch without exposing their actual values, such as:


Best Practices:

  • Never share the arduino_secrets.h file publicly or include it in repositories without careful consideration.
  • Use unique and descriptive names for your secret variables to enhance code readability.


As you delve into the world of Arduino, mastering the art of managing secrets is a valuable skill. The arduino_secrets.h file empowers you to build secure, collaborative, and efficient projects, ensuring your secrets remain safe while your creativity knows no bounds. By separating sensitive information into the arduino_secrets.h file, you can share your main sketch code without inadvertently sharing your private data. This is particularly useful when collaborating on open-source projects or when you want to share your code publicly while keeping your credentials secure.

Happy Tinkering Folks!

You can find all of our Arduino guides here: Arduino Guides

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Luke Barber

Hello, fellow tech enthusiasts! I'm Luke, a passionate learner and explorer in the vast realms of technology. Welcome to my digital space where I share the insights and adventures gained from my journey into the fascinating worlds of Arduino, Python, Linux, Ethical Hacking, and beyond. Armed with qualifications including CompTIA A+, Sec+, Cisco CCNA, Unix/Linux and Bash Shell Scripting, JavaScript Application Programming, Python Programming and Ethical Hacking, I thrive in the ever-evolving landscape of coding, computers, and networks. As a tech enthusiast, I'm on a mission to simplify the complexities of technology through my blogs, offering a glimpse into the marvels of Arduino, Python, Linux, and Ethical Hacking techniques. Whether you're a fellow coder or a curious mind, I invite you to join me on this journey of continuous learning and discovery.

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