500+ Arduino Projects with Code - Circuit Diagrams & Tutorials

COVID19 is really a historic pandemic affecting the whole world very badly and people are building a lot of new devices to fight with it. We have also built an automatic sanitization machine and Thermal Gun for Contactless temperature screening. Today we will build one more device to help fighting with Coronavirus. It is a cough detection system, which can distinguish…

It is very exciting to see something floating in the air or free space that is exactly what an anti-gravity project is about. The object (basically a small piece of paper or thermocol) is placed between two ultrasonic transducers which generate acoustic sound waves. The object floats in the air because of these waves which seem to be of anti-gravity. This is not only a cool…

With all the technology available to us in recent times, it's not hard to build a safety device for women which will not only generate an emergency alarm but also send a message to your friends, family, or concerned person. Here we will build a band that can be worn by women, using which they can inform police or anyone, using SOS emergency SMS along with the current…

Since the outbreak of Covid-19, infrared thermometers are being used as a screening tool to scan the people at Airports, Railway Stations, and other crowded establishments. These scans are being used to identify potential patients of Covid-19. The government made it compulsory to scan everyone before entering the office, school, or any other crowded place.

A potentiometer is a mechanical device using which one can set the resistance according to the desired value, thus changing the current passing through it. There exist many applications for a potentiometer, but mostly, a potentiometer is used as a volume controller for audio amplifiers.  The digital volume control circuit is an electronic circuit that accurately adjusts…

The pH scale is used to measure the acidity and basicity of a liquid. It can have readings ranging from 0-14, where 0 shows the most acidic liquid and 14 shows the most basic liquid. 7 pH is for neutral substances that are neither acidic nor basic. Now, pH plays a very important role in our lives, and it is used in various applications. For example, it can be used in a…

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 IDE. In most projects, we usually connect to HC05 to an Arduino and use it to wirelessly communicate with another smart device like a mobile phone. This is fairly simple and we have built many interesting projects with it like Bluetooth Controlled…

In previous tutorials, we have covered the basics of FreeRTOS with Arduino and the Queue kernel object in FreeRTOS Arduino. Now, in this third FreeRTOS tutorial, we will learn more about FreeRTOS and its advance APIs, which can make you understand the multi-tasking platform more deeply.

Semaphore and Mutex (Mutual Exclusion) are the kernel objects…

In the previous tutorial, we introduced FreeRTOS in Arduino Uno and created a task for the blinking LED. Now, in this tutorial, we will dive more into advance concepts of RTOS APIs and learn about communication between different tasks. Here we also learn about Queue to transfer data from one task to another and demonstrate the working of queue APIs by interfacing 16x2 LCD…

In this project, I am going to Interface an Alcohol Sensor with Arduino. Here I have designed an Arduino Shield PCB using EASYEDA online PCB simulator and designer. Arduino Alcohol Detector will detect the alcohol level in breath and by using some calculations in code we can calculate the alcohol level in breath or blood and can trigger some alarm.

The OS present inside the embedded devices is called an RTOS (Real-Time Operating System). In embedded devices, real-time tasks are critical where timing plays a very important role. Real-time tasks are Time Deterministic means the response time to any event is always constant so that it can be guaranteed that any particular event will occur at a fixed time. RTOS is designed…

Corona Virus (Covid19) is wreaking havoc in the world. Almost every country is suffering from the Corona Virus. WHO has already announced it a Pandemic disease and many cities are under lockdown situation, people can’t step out of their homes, and thousands have lost their lives. Many websites are providing live updates of the coronavirus cases like Microsoft’s Tracker, Esri…