RFID Based Access Control System using 8051

jojo October 31, 2017 8 Comments
RFID Door Access Control System using 8051 In this project, we are going to build an RFID Based Access Control System using 8051 Micro Controller. The same system can be named like RFID based door lock or RFID based access management system. If you have been to big hospitals or companies, you might have seen how they used RFID based locks to restrict access to certain areas. In hospitals, only hospital staff with approved RFID tags can access Intensive...
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Microcontroller Based Programmable Data-cum-Temperature Display

praveen February 11, 2016 7 Comments
Microcontroller Based Programmable Data-cum-Temperature Display. LCD display are most widely used in applications like token display machine in malls, supermarkets, restaurants, cafe-houses etc. The project presented here demonstrates the working through wireless by use of Bluetooth technique. This circuit is designed by Mr. Vivek Kumar Kamboj from Haryana. Circuit and working. This circuit uses microcontroller that accepts data via Bluetooth from various types of gadgets like android based smartphones, laptop, etc. The IC1 AT89C51 is the heart of this...
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LiPo battery charger circuit.

praveen September 2, 2015 3 Comments
LiPo battery charger. Li-Po battery or Lithium-Polymer battery is a rechargeable battery based on the Lithium-ion technology enclosed in a flexible pouch. This soft, flexible pouch makes them very light with a compromise in mechanical strength. Li-Po batteries are widely used in applications where weight is a critical factor. The common applications are radio controlled model flight, RC toys, hand held devices etc. The Lithium Polymer battery is evolved from the Lithium Metal Batteries.The main difference is that instead of...
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Nest Thermostat Review

jojo May 3, 2017 No Comments
Nest 2nd Generation Self Learning Thermostat Until recently no one cared about what thermostat they are using. But that is no longer the case. This is the era of smart thermostats, thermostats which can be easily programmed or better self-learning. Nest self learning thermostat is such a programmable, self learning gadget developed by Nest Labs, a company co-founded by former Apple employees Tony Fadell and Matt Rogers in 2010 and was acquired by Google in 2014. The first generation...
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Amazon Echo Review – Is it worth the hype?

jojo February 3, 2016 No Comments
Amazon Echo, easily described as the Siri for your home, is an amazing smart gadget by Amazon for your home. Echo is basically an expertly tuned speaker with wi-fi and bluetooth connectivity. Its hardware is very nice, a 9.25” high cylinder with a woofer and a tweeter and is capable of producing 360 degree omni directional audio. It also has an array of 7 microphones which listen to everything you say from any direction, and its listening skills are...
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ultrasonic water level controller

Ultrasonic water level controller using 8051

praveen July 30, 2015 16 Comments
Ultrasonic water level controller using 8051 microcontroller. A simple water level controller using ultrasonic  range finder module and 8051 microcontroller is discussed in this article.Many projects based on ultrasonic range finder and water level controllers have bee already discussed here. This is just another application of the ultrasonic ranging module. This water level controller can monitor and control water tanks up to 2m deep and the accuracy of measuring is as low as 1cm.  Since no mechanical float switches or...
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How to Build PCB Online using Web Based EDA Tools

jojo December 22, 2016 3 Comments
This is a brief review of the capabilities and ease of use of three of the most interesting, innovative and downright disruptive web-based EDA tools: EasyEDA Upverter Autodesk 123D Circuits (formerly Circuits.io) The same simple astable multivibrator circuit is entered into each tool and the design process followed through simulation (where offered), to PCB layout and Gerber download. For all of the products reviewed, there’s no need to install any software. They all run in any HTML5 capable, standards...
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RFID card

Interfacing RFID to 8051microcontroller

praveen July 29, 2015 1 Comment
Interfacing RFID  to 8051 . RFID or Radio Frequency Identification is a method in which electromagnetic waves are used for transmitting data for the purpose of identifying tags attached to objects. An RFID system consists of a transmitter (tag) and a reader.The tag is encrypted with a unique code and the reader scans this code for the identification purpose. The tags are generally of two types: active and passive. Active tags have a battery fitted to it and it transmits the unique...
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Interfacing PIR sensor to 8051 microcontroller

Interfacing PIR sensor to 8051 & DIY Intruder Alarm

praveen July 29, 2018 17 Comments
This article is divided into two sections Interfacing PIR sensor to 8051 DIY intruder alarm circuit Interfacing PIR sensor to 8051 microcontroller PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going into the core of the article, let’s have a look at the PIR sensor and its...
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GSM based Fire Alarm Project

GSM based SMS Alert Fire Alarm System using Arduino

jojo August 10, 2016 128 Comments
In this article,we are going to build a Fire Alarm System using Arduino, LM35 Temperature Sensor and GSM Module. The objectives of this fire detector using arduino is to sense the surroundings for occurrence of fire with help of LM35 temperature sensor, and send 3 SMS alerts to two mobile numbers stored inside the arduino program if fire is detected (using GSM Module). We have developed a very good tutorial on how to interface GSM Module with Arduino and send/receive...
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Simple RFID based Door Lock using Arduino

jojo April 7, 2015 6 Comments
Its quiet fun to work with RFID based projects! In the previous article, we saw how to interface RFID with Arduino. Interfacing is the first step to create any useful project. So why don’t we create an RFID based Access Control System or an RFID based Door Lock using Arduino? The system I have designed here is a simple version of the project. This project can be enhanced with a lot of features (which I will be doing in...
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Interfacing RFID with Arduino – How to Read RFID Cards using Arduino

jojo March 26, 2015 24 Comments
In this tutorial, we are dealing with yet another interfacing technique. This time we are interfacing an RFID Reader which can read RFID Tags to Arduino. RFID is Radio Frequency Identification. An RFID reader is used to read RFID tags (which contain certain unique data stored in a chip). An RFID reader and an RFID tag, both have a coil surrounding them.  When an RFID tag is shown near an RFID Reader, it collects the unique tag data (a...
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How to Interface GSM Module to Arduino-Send and Receive SMS

jojo August 11, 2018 169 Comments
In this article, we are going to see how to interface GSM Module to Arduino. There are different kinds of GSM modules available in market. We are using the most popular module based on Simcom SIM900 and Arduino Uno for this tutorial. Interfacing a GSM module to Arduino is pretty simple. You only need to make 3 connections between the gsm module and arduino. So lets get to business! A GSM Module is basically a GSM Modem  (like SIM...
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Frequency counter using arduino

praveen February 19, 2015 18 Comments
Frequency counter using Arduino (upto 40KHz). Many guys here were asking for a frequency counter and at last I got enough time to make one.  This frequency counter using arduino is based on the UNO version and can count up to 40KHz. A 16×2 LCD display is used for displaying the frequency count. The circuit has minimum external components and directly counts the frequency. Any way the amplitude of the input frequency must not be greater than 5V. If...
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IPCA Electronics Expo 2015 – Revolutionizing the Make in India campaign

jojo January 7, 2015 2 Comments
A new year has began and people all over the world are looking forward with good hope. What’s in cards for people in the Electronics industry ? Well, the 8th IPCA Electronics Expo India scheduled to happen on August 20-22, 2015 is definitely an event to look forward. This event attended by industry leaders in different sectors of electronics is all set to take place in Pragati Maidan, New Delhi, India. IPCA Electronics Expo’s aims to provide the electronics...
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Interfacing pressure sensor to arduino

praveen August 14, 2017 6 Comments
Interfacing SPD005G pressure sensor to arduino This article is about interfacing pressure sensor to Arduino. The pressure sensor used here is SPD005G from Smartec . SPD (Smart Pressure Device) is a series of silicon based pressure sensors suitable for industrial as well as house hold applications. These sensors are generally available in plastic inline or dual inline packaging. SPD sensors are generally available in two operation modes namely gauge type and absolute type. In gauge type, the pressure is...
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We Are Launching An Online Store to Shop Electronic Kits,Boards and Components

jojo May 28, 2015 11 Comments
Hi Everyone, Today we are announcing a happy news in CircuitsToday. We are launching an Online Store at Store.CircuitsToday.com We will be Live from today, 18th December 2014. We are launching with only 8051 Micro controller based Project Kits for Engineering Students and Hobbyists. We will be adding more inventories very soon in our online shop. You can expect popular and commonly used products for sale in coming months. WE WILL BE SELLING MAJOR ELECTRONIC COMPONENTS DEVELOPMENT KITS  PROGRAMMERS...
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Digital Code Lock using Arduino with LCD Display and User Defined Password

praveen December 5, 2014 44 Comments
We have published a digital code lock using arduino some weeks before. This one is a little different. The earlier version was based on a defined password, where the user can not change it. Moreover there was no LCD display interfaced with the project to output lock status. This project is a much improved version of the same digital code lock which comes with a user defined password and LCD display. The user will be prompted to set a...
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Arduino Projects -The Big List of Arduino Based Projects

jojo September 21, 2017 16 Comments
In this article, we compile all the best and interesting projects we have developed using Arduino. These days Arduino projects are used for academic course fulfillment as well. In any case, Arduino is a very interesting platform to build real world projects. List of Arduino Projects Gas Leakage Detector with GSM Module for SMS Alert and Sound Alarm  An Arduino Uno board is interfaced with  a MQ5 gas sensor and GSM Module in this project. This project – named...
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Interfacing gyroscope to arduino

praveen December 9, 2014 7 Comments
Interfacing gyroscope to arduino uno. This article is about interfacing gyroscope to arduino. Gyroscope is a device used for measuring the angular velocity in the three axes. It works under the concepts of angular momentum and can be used to determine the orientation of an object. Typical applications of gyroscope includes missile guidance, flight control, smart phones, game station joy sticks etc. Mechanical gyroscopes, MEMS gyroscope, optic fiber gyroscope, ring laser gyroscope. Here we deal with the MEMS gyroscope....
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LPG sensor using arduino

praveen November 18, 2014 7 Comments
LPG sensor using arduino with alarm and cutoff. A simple LPG sensor using arduino is shown in this article. This circuit indicates the amount of LPG in the air. The circuit  sounds an alarm and trips a relay  when the concentration is above a predetermined level. MQ2 is the gas sensor used in this project. MQ2 is an SnO2 based gas sensor which can sense gases like methane, propane, butane, alcohol, smoke, hydrogen etc. Since LPG primarily contains propane...
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OhmMeter using Arduino – with Auto Ranging Feature

praveen November 18, 2014 15 Comments
Auto ranging ohmmeter using arduino. This article is about a simple auto ranging ohmmeter using arduino. The measured resistance is displayed using a 16×2 LCD display. The circuit is sufficiently accurate and uses minimum number of external components possible. Before going into the details of this project, lets have a look at the basic resistance measurement method. Resistance measurement. The figure above shows the circuit diagram of a simple resistance measurement scheme. Rx is the resistance to be measured....
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8051 Timers and Counters

jojo October 27, 2014 5 Comments
In this article, we focus on Timers/Counters of the 8051 micro controller. The 8051 has two counters/timers which can be used either as timer to generate a time delay or as counter to count events happening outside the microcontroller.                       The 8051 has two timers: timer0 and timer1. They can be used either as timers or as counters. Both timers are 16 bits wide. Since the 8051 has an 8-bit architecture, each 16-bit is accessed as two separate registers...
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We are on all Social Media – Youtube Facebook Twitter Linkedin and Slideshare

jojo October 21, 2014 No Comments
Hello Everyone,  Lets hope a good day for all! We have been live from 2008 till this date serving you all with fun electronic circuits and projects. In this long span of 6 years, we have come up with a handful of interesting electronic circuits and we have written a couple of good tutorials on micro controllers like 8051, AVR, PIC etc. At the same time, we know we could have done a lot more for the electronics community!...
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Water level controller using arduino

praveen January 23, 2018 43 Comments
Arduino water level controller / indicator. This article is a about a fully functional water level controller using Arduino. The circuit displays the  level of water in the tank and switches the motor ON when the water level goes below  a predetermined level. The circuit automatically switches the motor OFF when the tank is full. The water level and other important data are displayed on a 16×2 LCD display. The circuit also monitors the level of water in the...
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