500+ DIY Arduino Projects with Code & Circuit Diagram

Arduino is a popular open-source development board used by engineers, hobbyists, and makers to develop electronic projects and prototypes easily. 

The below list consists of a large collection of free Arduino Projects that was built by us here in Circuit Digest. All the projects that we have provided here consist of neatly illustrated Arduino circuit diagrams and detailed explanations, the relevant Arduino code is also provided for a complete do-it-yourself tutorial. If you want more projects you can also check out our collection at Arduino IoT Projects | Arduino Robotics Projects | Arduino AI Projects | Arduino Home Automation Projects | Raspberry Pi Projects | ESP32 Projects

A potentiometer is a mechanical device using which one can set the resistance according to the desired value, thus changing the…

pH scale is used to measure the acidity and basicity of a liquid. It can have readings ranging from 1-14 where 1 shows the most…

HC-05 Bluetooth Modules are the go-to Bluetooth modules for any Arduino project! It’s easy to hook up and code in the Arduino…

In previous tutorials, we have covered the basics of FreeRTOS with Arduino and the Queue kernel object in FreeRTOS Arduino. Now…

In the previous tutorial, we introduced FreeRTOS in Arduino Uno and created a task for the blinking LED. Now, in this tutorial…

In this project, I am going to Interface an Alcohol Sensor with Arduino. Here I have designed an Arduino Shield PCB using…

The OS present inside the embedded devices is called an RTOS (Real-Time Operating System). In embedded devices, real-time tasks…

Corona Virus (Covid19) is wreaking havoc in the world. Almost every country is suffering from the Corona Virus. WHO has already…

Often times, we need to secure a room at our home or office (perhaps a secret dexter’s laboratory) so that no one can access…

We previously built an Arduino based paper currency counting machine using a color sensor. Now in this project we are building…

If you have ever worked with Batteries, SMPS circuits or other Power supply circuits, then often it would have occurred that…

Now day’s automation systems are everywhere whether its home, office or any big industry, all are equipped with automation…