Data Logger

Can you store documents in a box down in your root cellar with 80% humidity? How is the climate in your fridge? These are questions you can easily answer using a data logger which records humidity and temperature over time.

Preface

I started the data logger project, because I tried to figure out if I can store my documents down in the root cellar. The humidity in this cellar varies from 75% up to 90% which is way to high for documents. So I plan to store the documents in a sealed box. Because I am not sure if the sealing is good enough for the environment down in the cellar, I will first put a “test box” there with a data logger inside.

There are plenty commercial data loggers available to use for this kind of tasks, but it is much more fun to build a own.

Versions

This documentation is showing how to build the minimal and simple version of the data logger. The deluxe version of the data logger has a own documentation here: Data Logger Deluxe.

Table of Contents

• Overview
• Usage
• Parts
• Build the Hardware (Minimal)
• Build the Hardware (Simple) 
• Build the Software
• Understand the Software

Continue reading: Overview