In our blog, we are going to make a GSM based home security system. Security is a big challenge everywhere because thefts ,gas leakage etc. are increasing day by day. This system  is used  to alert us from danger by sending SMS through GSM Modules. This project  uses Arduino UNO, SIM800L GSM Module, MQ2 Gas Sensor (Detects LPG, Butane, Methane, Smoke), PIR sensor and LCD display. Here, gas sensor acts as a gas leakage detector, PIR acts as a motion detector (trespasser detector) and LCD to display the message for our reference. This project detects either gas ..read more

RFID is an acronym for Radio Frequency Identification and refers to a technology whereby digital data encoded in RFID tags or RFID cards (the one you use it in your Office or College ID Cards with RFID) that are captured by a reader via radio waves. RFID is similar to barcoding in that data from a tag or cards are captured by a device that stores the card ID in a database with additional details. The RFID Tag/Card has a unique ID and the reader reads that ID and it looks for the additional details like Employee Name, Blood Group, Position, Date of Birth,etc in its database. Note that, RFI ..read more

An RGB LED is an integrated LED with all three primary colors in it, RED, GREEN and BLUE. Using an RGB LED we can make all other colors by mixing a proper amount of these three colors. The amount of voltage applied to each pin specifies the amount of colors it emits. This is called additive mixing. There are two types of mixing we are using in the real world. They are Additive Mixing (RGB) Subtractive Mixing (CMYK) Additive Mixing: Additive Mixing sums up the amount of color from each RGB color to make secondary colors. Eg. Red+Green = Yellow. In additive mixing the Red, Green and Blue are t ..read more

16×2 LCD is an alphanumeric display that can show up to 32 characters on a single screen. You can display more characters by scrolling the texts one by one. We have already seen how to connect LCD Display directly with the Arduino using 4bit and 8bit modes in our previous tutorial. But those two modes will utilize many numbers of GPIO Pins of our Arduino and we would have to end up with less number of pins for other sensors and actuators. To overcome this problem we use LCD I2C backpack with our LCD. This I2C Backpack uses PCF8574 Remote 8 bit I/O Expander. It translates th ..read more

GPS was widely used in Marine navigations mostly in olden days. After that, governments decided to provide access to all users in the world to use GPS navigation. Nowadays it is used widely by all people on their Mobile phones, Car Navigation Systems, Drones, Asset Tracking systems in logistics, Anti-Theft for motorcycles, etc. Almost all of us might have used Google Maps in anyway. So we are aware about what a GPS does. So let’s go deeper into it on how do we use this GPS Module with Arduino to get location, time date, etc. A GPS module receives signals from the GPS Satellites. There are mini ..read more

ThingSpeak is an Open-Source IoT application and API to store and retrieve data from Hardware devices and Sensors. It uses HTTP Protocol over the Internet or LAN for its communication. The MATLAB analytics is included to analyze and visualize the data received from your Hardware or Sensor Devices. We can create channels for each and every sensor data. These channels can be set as private channels or you can share the data publically through Public channels. The commercial features include additional features. But we will be using the free version as we doing it for educational purpose. You can ..read more

SIM800L Module is a small GSM/GPRS Module and ideal for small ideal projects. The module supports quad-band GSM/GPRS network, available for SMS and GPRS message data remote transmission. SIM800L is advanced than its previous SIM900 modules. There are other multiple versions of SIM800 is available. The choices of models depend upon the application needs. But SIM800L is used widely for common applications. The features of different models are given below. SIM800L has FM functionality. SIM800C has Bluetooth functionality. SIM800F is pin compatible to the SIM900 module. SIM868 is dual s ..read more

DFPlayer Mini (or) MP3-TF-16P Module is a tiny low-cost mp3 module with inbuilt Amplifier. You can connect a 3-Watt Speaker directly to the Module. Additionally, you can use an audio amplifier like PAM8403 to boost the Audio signal. It has an SD Card port and reads the MP3 files from the SD Card. This MP3 Module can work standalone or you can use any Microcontroller like Arduino via UART Ports (TX & RX). A Special library is published by DFRobot on GitHub. By using this MP3 Module you can use it in many applications like Train Announcements in Railway Stations, Fire alarm Voice Prompts, Ca ..read more

NRF24L01 is a Low power 2.4 GHz wireless RF Module from Nordic Semiconductors. It can operate with baud rates from 250 kbps up to 2 Mbps. If it is operated in an open space with a lower baud rate, it can reach up to 300 feet. So it is used in short range applications like Home Automation, Toys, Gaming Controllers and more. The NRF24L01 Module can able to both transmit and as well as receive the data. It uses SPI protocol for communicating with Microcontrollers. Hence you can use the Module with Arduino on SPI Communication pins. We will see how to interface this module with an Arduino and cont ..read more

MQ Gas Sensor use a small heater inside with an electro-chemical sensor. They are sensitive to Gases. Whenever the concentration of gas increases the resistance will decrease (but the current flow will get increased). It leads to change in voltage and it is read at Analog out pin which tells how much gas is concentrated in normal Air. This varied analog voltage is used to calculate the PPM of Gas. Similarly, the Module has a Digital output (connected with an Op-Amp) along with a Potentiometer. The Threshold/Sensitivity can be adjusted using the Potentiometer. Because to calibrate the sens ..read more