Live Brightness display on OLED with LDR Sensor and Arduino Nano

Overview

This DIY project builds a light-level monitor. An Arduino Nano reads an LDR light sensor and displays the live brightness on an OLED.

How It Works

1. The LDR's resistance changes with the amount of light falling on it.
2. The Arduino Nano reads the resulting analog value.
3. The brightness level is displayed on the OLED and updates instantly as lighting changes.

Complete Parts List

You Will Also Need

A USB-A to USB-C cable to connect the Arduino Nano C-Type to your computer and upload code — not included in this kit.

Applications

• Automatic lighting - the base for dusk-to-dawn lights
• Smart home - detect day and night
• Analog sensing - learn analog input with a simple sensor

Full Build Guide

Step-by-step instructions and code for this exact project are on Project Hub.

FAQ

Do I need coding experience? No prior experience is required - this kit is built around one specific project, and the full code is freely available. See the build guide above.

What tools do I need beyond what's included? A computer with the free Arduino IDE (or ESP8266 board support, where applicable) installed to upload the code. No soldering is required for this build. You'll also need a USB-A to USB-C cable to connect the board — not included.

Can I reuse the parts afterward? Yes - every component in this kit is a standard, reusable part you can use in future projects, not a single-use kit.