Camera streaming systems have become popular, enabling users to record and/or live stream a video over the Internet. The Raspberry Pi (RPi) camera is widely used for its streaming feature as it easily captures live images and videos. Plus, it’s straightforward to interface the RPi camera with the Raspberry Pi 2/3/4 — or any other…

In Part 1 of this series, we learned how to interface an organic light-emitting diode (OLED) display, using analog voltage (a potentiometer), with Arduino. In Part 2, we covered how to present data from an analog sensor — specifically, a light-dependent resistor (LDR) and soil moisture sensor — on an OLED display. In Part 3,…

In Part I and Part II of this series, we learned how to use an analog sensor — including a potentiometer (POT), a light-dependent resistor (LDR), and a soil-moisture sensor — to present values on an organic light-emitting diode (OLED) display.  In Part III, we’ll also present data on an OLED display, but this time…

In Part I of this tutorial, we learned how to present data (or values) using a potentiometer (POT) and an organic light-emitting diode (OLED) display. For this project, the POT was an analog sensor (potentiometers can also be digital), which acts as a resistor to control the flow of an electric current. The OLED technology…

Digital compasses are electronic devices that use sensors to determine the magnetic field, displaying the navigational direction numerically. These types of compasses typically use a magnetometer sensor to measure the strength of the magnetic field to detect the direction. One low-cost, three-axis digital magnetometer is the HMC5883L. It measures the value of the magnetic field…

Microcontrollers are designed to run concise firmware that’s dedicated to a specific application. The firmware is embedded software, which is written into the program memory. The firmware codes are typically short and designed to manage and execute several micro tasks down to the hardware level.  Since microcontrollers are dedicated to a single application, these devices…

Raspberry Pi is the most popular single-board computer. As an embedded microcomputer, data acquisition is almost essential in Raspberry Pi. Though Pi has several GPIO (General Purpose Input/Output) pins, it does not have any built-in or onboard analog-to-digital converter. Therefore, Pi on its own cannot sample data from analog sensors. In embedded applications, analog sensors…

Sensors are used to convert a physical quantity, such as light intensity or temperature, into an electrical one. There are several types of sensors that can easily be used with an Arduino board, which is an advantage. For example, any analog or digital sensor easily interfaces with Arduino as the board offers both analog and…

India is an agricultural country & farming is a basic occupation in our country. Since today farmers are watering the plants everyday but this is the project whichhelps the farmers & in farming field for watering without any problem because here there is watering system is made. In this system the thirsty plant gives message to the farmer that it needs water and then we can water the plants. Nowadays, people have nursery at their home and some people have hobby of gardening. So at these places also this watering system is very useful for people. Many plants need more water & some plants need less water depending on the level of moisture in the soil.People use this system in their daily life & this system is called botanical system. 

Everyone wondered how useful is the automatic brightness feature on phones, quickly adapting screen’s brightness according to the surrounding light intensity.In this project I try to create something similar for any PC or Laptop running on Linux(preferably Ubuntu 14.04).My goal was to keep it cheap and simple as much as possible.So to make a prototype of it I used LDR to measure light intensity and an arduino communicate with my machine. On my machine I used a python script  to communicate over USB with arduino and to edit the file which is responsible for the brightness of screen.

This is a project based on Arduino board which can measure the power consumption of the devices. When we connect this wattmeter on to a device which is in operation, the 16*2 LCD displays its power consumption value in Watts. The project uses an Arduino pro mini board whose ADC feature is used along with the concept of Ohm’s law and Voltage Divider circuit to develop this Wattmeter. 

ESP 8266 is the latest buzz on internet. It is a WiFi module which is just a bit larger than a 1 Re coin. Well that’s not what it is famous for though. What made it very popular among electronic hobbyist is its unbelievable low cost. I got it just for $5 (~300 Rs.) An arduino along with a WiFi shield would cost 10 times of what this module costs.vvvvvIt can be interfaced with any microcontroller through USART communication, meaning it just need the RX and TX pins. Another feather to its hat was added recently. The developer released the SDK files of the module and hence even the module can be re-programmed and its GPIO pins can be used independently without any additional microcontroller. But that is beyond the scope of this tutorial. We would be using the module along with Arduino UNO.

The GPS receiver is used to get accurate geographical location by receiving information from satellites. It receives information from satellites and gives location information in terms of latitude and longitude. It gives latitude and longitudes with accuracy of degree-minute-second. Using this latitude and longitude co-ordinates one can easily trace out the location on entire globe. The GPS receivers have enormous applications.The GPS receiver gives output serially in form of strings with NMEA 0183 protocol. These strings are received serially by host computer or host processor/controller for display or to take any decision or action. The following figure shows the output of GPS receiver on hyper terminal of desktop computer.  

Do you find it annoying when the cake you set in the freezer doesn’t set itself on time? Maybe someone is opening the fridge frequently when you aren’t noticing. Or you may be having a personal cupboard from where your things just vanish or gets misplaced when you are away. So, how to know when your fridge/ cupboard’s door get opened?Well, we have a simple solution for that. Using this you can check at what time and also how many times it was opened, and you can check it from anywhere on internet.

There are many different types of robot projects that you might be aware of including the following: Remote-controlled robot (car type 3/4-wheeler) Joystick controlled robot Gesture controlled robot Smartphone (Bluetooth) controlled robot Obstacle avoidance robot Object follower robot Object finder robot Robotic Arm Pick and place robot And many more This article also describes a…

The project aims at controlling a wheelchair by means of human voice. It enables a disabled person to move around independently, using a voice recognition application which is interfaced with motors.The prototype of the wheelchair is built using a micro-controller, chosen for its low cost, in addition to its versatility and performance in mathematical operations and communication with other electronic devices. The system has been designed and implemented in a cost effective way so that if our project is commercialized the needy users in developing countries will benefit from it. 

The IoT device designed here is a weather station built by interfacing a character LCD with the ESP8266 board. The device fetches the weather data of the location it is installed and display it on the LCD screen. It must be noted that there are no sensors used in this device and the device gets the weather data from an IoT platform i.e. Open Weather Map. The device fetches temperature and precipitation information using API keys and display it on the LCD.  

From the previous project, it has been already learnt to configure control parameters of a Bluetooth Module. In this project, it will be demonstrated that how two Bluetooth modules can be paired together and allowed to share data between them. For pairing of two Bluetooth modules, one of them needs to be configured to Master role and other needs to be configured to Slave role. Apart from this, both modules should be in Order Response Work Mode so that AT commands can be passed to them. The baud rate of the two modules also need to be same and SPP and INQ must be initiated in both the modules. In order start sharing data between the modules, both the modules should have communication mode enabled by setting CMODE parameter set to 1.

In the previous project, how Bluetooth module can be configured to operate in Order Response Work Mode was discussed. The previous project also detailed the AT commands available for the HC-05 Bluetooth module. The AT commands can only be used in Order Response Work Mode. The AT commands are very useful and can be used to change or set multiple control parameters of the module. In this project, some of the AT commands will be used and tested. The project will demonstrate using AT commands to change device name, password, mode and baud rate of the module. In the end of the demonstration, the default settings will be restored using the AT commands. 

Home Automation is the new trend among urban households. Home automation system allows controlling home appliances through a remote. The remote can be an IR remote, RF remote or even a mobile phone. An internet based home automation system could be most accessible setup because such a system can be controlled from anywhere and anytime. Like, one is returning home and before leaving office and getting into the car, he can switch on the AC of his living room so that by the time he reaches home, the living room is already cooled. Such an advantage can be availed only on a home automation which is controlled over the internet.