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

Here we are going to establish a communication between an ATmega8 microcontroller and Arduino Uno. The communication…

In this project we will develop a tone generator using Arduino Uno. We will have buttons interfaced with the UNO and…

In this tutorial we will develop a 5V variable voltage source from Arduino Uno. For that we are going use ADC (Analog to…

In this tutorial we are going to develop a circuit using FLEX sensor, Arduino Uno and a Servo motor. This project is a…

In this project we are going to interface 5 RGB (Red Green Blue) LEDs to Arduino Uno. These LEDs are connected in parallel for…

In this project we are going to design an 8x8 LED matrix display, for that we are going to interface an 8x8 LED…

In this project we will be developing a fun circuit using Force sensor and Arduino Uno. This circuit generates sound linearly…

In this Arduino based automatic water level indicator and controller project we are going to measure the water…

This project explains designing a home automation system which is controlled by a computer to switch On and switch Off various…

In this tutorial we are going to design a Barometric Pressure Measuring System using BMP180 and ARDUINO. First of all for…

Tachometer is a RPM counter which counts the no. of rotations per minute. There are two types of tachometer - one is mechanical…

Security is a major concern in our day to day life, and digital locks have became an important part of these security systems.…