Arduino

In the previous tutorial, we learned about serial communication in Arduino using the universal asynchronous receiver-transmitter (UART). We also discussed how Arduino can talk with a computer system using the UART protocol.  The UART is a dedicated circuit that implements serial communication according to its protocol. Arduino boards have one or more UART/USART. These UART/USART interfaces are available through…

In previous tutorials, we’ve covered serial communication using the UART and software serial in Arduino. The universal asynchronous receiver/transmitter (UART), I2C, and SPI are the most commonly used serial interfaces in embedded systems.  UART is useful for full-duplex serial communication with a single device over two wires. The I2C or two-wire interface (TWI) is used for half-duplex…

In the previous article, we learned how to send a message to scroll on a notice board from a smartphone using the Bluetooth application, and how to display the date and time. However, Bluetooth is only adequate for short-distance communication of about 10 meters. But what if it’s necessary to send notifications from a greater…

In the previous tutorial, we learned how to use the applications of the Matrix LED scrolling message boards. This included how to send a message or notice to display on such a board by using a laptop or desktop PC. In this article, we’re going to learn how to send that message from a smartphone…

Remote data-monitoring systems have been widely used in nearly all manufacturing industries for many years and with several benefits. For example, these systems allow for the tracking, recording, and ongoing monitoring of data from different sensors — such as for temperature, pressure, flow, humidity, etc. — in a central control room of a plant.  Various…

This tutorial explains how to automate a hand sanitizer bottle. Sanitizers can be found for use at many public places (and especially recently, given the COVID-19 pandemic). However, each press of the cap leaves behind several types of germs on it. One way to avoid this is to automate the bottle so that users never…

Fading or controlling led brightness using arduino uno and potentiometer/variable resistor is not a very hard task. Arduino predefined libraries made it very easy to fade led with arduino uno. Whats going behind the arduino code predefined commands/instructions at software and at hardware level is important to understand. Students normally start with the pre-written arduino…

In the previous tutorial, we learned how to interface a DHT-11 sensor with Arduino. DHT-11 is a digital sensor that comes integrated with an 8-bit microcontroller. This integrated microcontroller outputs humidity and temperature values in the form of a 40-bit digital data packet.  In the last tutorial, we read the data packet by polling one…

In the previous tutorial, we learned how to interface an LM35 temperature sensor with Arduino. LM35 is an analog sensor that can be interfaced with Arduino’s analog input pin.  In this tutorial, we’ll cover how to interface a DHT-11 sensor with Arduino. DHT-11 is a digital temperature and humidity sensor. It outputs a much more…

Here is a very nice and interesting application of controlling a missile launcher model through a smartphone using an android Bluetooth application. The model of the missile launcher is built using two servo motors. One servo motor (azimuth motor) turns the missile launcher left and right while another servo motor (elevation motor) moves the missile…

In this tutorial i am going to teach you about how to use arduino flow meter to measure the amount of water passing through the water valve. Flow meter is actually a valve. One can control the valve manually and digitally in order to limit the flow of water through the pipe. Normally manual water…

This project is by a final year student of university of liverpool. The project is prototype of a bistatic radar system. Prototype is made using arduino uno and ultrasonic transmitter and receiver. To rotate the ultrasonic transmitter and receiver servo motors are used. Ultrasonic receiver and transmitter are mounted on the top of the servo…

​This is a simple tutorial on how to control speed and direction of stepper motor using arduino uno and bluetooth module hc-06 through an android phone app. The motor which i am using is Uni directional stepper motor. Their are two types of stepper motors unidirectional and bidirectional. Uni directional has four phases and bidirectional…

Blinking an led is basic getting started program/project through which every newbie has to go through upon entering the field of microcontrollers(arduino, pic stm32 etc). After blinking led newly entrants try to explore more features of the particular microcontroller by making some diy(do it your self) projects. Led dimmer or intensity/brightness control of led using ldr(light dependent…

In the previous tutorial, we learned how to display custom characters on a character LCD. Character LCD is the most commonly used display device in embedded systems and circuits.  Although character LCDs are from sophisticated, they provide a simple interface that’s easy to use and learn. They also convey useful information about operating conditions, warnings,…

An electrical design engineer by profession, Sandeep Sharma is a part time hobbyist who likes to experiment with electronic projects, especially involving Arduino. With an aim to share his knowledge about arduino and embedded projects, he owns a website as well as a YouTube channel through which he showcases certain interesting projects. In one of his Arduino based projects, he made a unique use of old DVD drives to build a DIY CNC Plotter at home. This machine is not only inexpensive but also quite easy to construct and operate. Presented here, is one of his exciting DIY projects that illustrates the construction and coding of an arduino based mini CNC plotter.

In the previous tutorial, we discussed scrolling long text strings on a character LCD using Arduino. However, it’s also possible to display custom characters on the LCD. These custom characters are user-defined and are stored in Character Generator RAM (CGRAM) of the LCD module.  The different LCD modules have different Display Data RAM (DDRAM) and CGRAM, which…

In the previous tutorial, we discussed:  The functional blocks of a character LCD How character LCD works and is interfaced with a controller  How to display text on a character LCD In this tutorial, we will learn about scrolling long string of text on a character LCD, which can be tricky. A character LCD module has…

​In this tutorial i am going to make an arduino home security system. One can install this diy arduino security system project on his home main door. The diy arduino security system checks two things. First it checks if some one approached the door? Second it checks if door is opened by the person? When the…

In the previous tutorial, we discussed multiplexing seven-segment displays (SSDs). Continuing with the display devices, in this tutorial, we will cover how to interface character LCD when using Arduino. Character LCDs are the most common display devices used in embedded systems. These low-cost LCDs are widely used in industrial and consumer applications. Display devices in embedded systems…