Communications Archives - Edgefx Tech Official Blog

RFID based Paid Car Parking

July 12, 2018 by Tarun Agarwal Leave a Comment

RFID based Paid Car Parking Project Kit

RFID based Car Parking System is a simple project that offers an efficient car parking management system with the help of RFID Technology. Car parking management in organizations and malls often consists of many tasks like issuing tokens, noting the check-in and checkout time, calculating fare and finally collecting the amount. As the number of vehicles is increasing, the problems faced by a manual parking management system are also increasing. Such problems can be eliminated to some extent by implementing an intelligent parking system where the entry and exit of cars are monitored and payment is made easy with sensor technology. This project deals with an interesting manner of security access based car parking system using an AT89C51 microcontroller and RFID Technology.

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RFID based Attendance System

November 6, 2017 by Tarun Agarwal Leave a Comment

RFID based Attendance System

At the present time, generally, attendance system in schools, colleges, etc is based on paper. So sometimes this procedure causes mistakes and also time taking process. So the proposed system uses RFID technologies to make a reminder of each student entering the classroom and also to analyze the time exist in the class. In this project, every student is selected with an RFID tag. The procedure of attendance can be done by insertion the card near the RFID reader. This article discusses what RFID is, and RFID based attendance system with an example project.

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Wireless Radio Frequency Technology Working and Applications

June 13, 2017 by Tarun Agarwal Leave a Comment

Wireless Radio Frequency Technology

The term wireless RF stands for “wireless Radio Frequency Technology”. If you are just starting with radios, this article can help. It is proposed to give a basic understanding of radio frequency,as well work as a quick reference for those who “know their knowledge” but may be observed to brush up on that one place that they never quite understood. Radio frequency is a measurement signifying the oscillation rate of electromagnetic radio waves or electromagnetic radiation spectrum of frequencies ranging from 300 GHz to 9 kHz. With the use of transmitters and antennas, the radio frequency field can be used for several types of wireless communications.

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How Does Bluetooth Keep Devices Connect

June 2, 2017 by Tarun Agarwal Leave a Comment

How Does Bluetooth Keep Devices Connect

The Bluetooth technology was implemented in the year 1994 by Jaap Haartsen and Sven Mattison. They were working in a mobile company called “Ericsson” which is located in Sweden. After this, five corporations came forward and combined to form the Bluetooth special interest group. Then they implemented the Bluetooth protocol design version 1.0 in the year 1999. It permitted to progress applications and communicating services over the interoperable radio modules and also data communication protocols. It was intended to give the information on the conditions, competencies and their architectures, a number of usage modules were recognized by the Bluetooth SIG.

What is a Bluetooth Device?

A Bluetooth is a high-speed, low powered wireless device that is intended to connect mobile phones or any other movable equipment together. It is an IEEE 802.15.1 specification for the use of low-power radio communications to connect various network devices, namely computers, mobile phones and also other network devices over small distances without using wires. The transmission of wireless signals can be done typically up to 10meters with Bluetooth over small distances.

Bluetooth Device

It is attained by low-cost embedded transceivers into the devices. It supports on the 2.45GHz frequency band and can support up to 721KBps along with 3-voice channels. This frequency band has been fixed aside by international contract for the use of scientific, industrial, medical devices (ISM) and rd-compatible with 1.0 devices.Simultaneously, Bluetooth device can connect up to eight devices and each device gives a unique 48-bit address from the IEEE 802 standard with the point to point connections or multipoint which are being made.

How to Connect a Bluetooth with Other Devices

The following steps involve to knowing how to connect a Bluetooth with other devices

Turn Bluetooth ON/OFF

Open the device’s settings
Tap Bluetooth and ON/OFF the switch
At the top of the mobile screen, a Bluetooth symbol shows when Bluetooth is switched ON

Note: To conserve battery, switch off Bluetooth option when you’re not using it.

Connect Bluetooth Device

To pair with a Bluetooth device, first switch ON your gadget’s Bluetooth. Before you can pair your device with any other Bluetooth enabled gadget, you must connect them. After you have connected the devices, in the future, you can automatically connect the devices when they are in the range of one another.

Unpair, or Change a Bluetooth Device Name

If your Bluetooth devices have several connections, you can choose which connection to use.
Your Bluetooth enabled gadget has a Bluetooth name that new devices see when you pair them via Bluetooth. You can change your Bluetooth device’s name.
Open your Bluetooth enabled gadgets Settings
Tap Bluetooth and Make sure Bluetooth is turned on.
Next, to the connected device, you’d like to change, tap Settings
On the mobile screen that opens, you can change the name of the device and pick profiles, or forget the device.
Tap Rename the Bluetooth enabled device
Enter a new name for your device and Tap Rename.

Why Bluetooth Connecting Fail

Bluetooth device mainly depends on both software and hardware to function properly. So if your gadgets can’t speak a common Bluetooth language, they won’t be able to pair.

Bluetooth Pairing Problems

In general, these devices support the standard Bluetooth 4.2, declared last year, should still be able to connect with devices using, say, the early Bluetooth 2.1, launched back in the year 2007.

The exceptions are devices that use a low energy version named Bluetooth Smart, which works on a variety protocol than older. Bluetooth enabled devices are not backward compatible and won’t pair with older devices that support Classic Bluetooth.

Bluetooth enabled devices that commonly use Bluetooth Smart comprise personal health gadgets like heart rate monitors, fitness bands, etc. These devices will only connect with a smartphone that also uses Bluetooth Smart or Bluetooth Smart Ready.

The devices also available with particular Bluetooth profiles. If Bluetooth is the mutual language for connecting devices, you can think of a profile as a dialect connected with a certain use. For example, you probably aren’t going to be capable of connecting a camera and a mouse because a camera doesn’t support the Human Interface Device Profile. But if both a mobile and a wireless headset support the Hands-Free Profile, you should be able to connect them.

However, if the connecting failure is a matter of consumer error, there are some steps you can fix Bluetooth pairing problems

Make sure Bluetooth is Activated or Not
Switch to Discoverable Mode.
Delete a paired device from a phone and search for it
Make sure the pairing devices are in near enough closeness to one another.
Decide which combining process your device employs
Charge up both pairing devices
Stay away from the WiFi router
Update the firmware of the hardware
Power down likely interferes
Get away from a 3.0 USB port

Advantages of Bluetooth Technology

It eliminates radio interference problem by using a technique, namely “Speed Frequency Hopping”. This method employs 79-channels of the specific frequency band, with every device, retrieving the channel for only 625 microseconds, i.e. the Bluetooth device must toggle between transmitting & receiving data from one time period to another. This indicates the transmitters change frequencies 1,600 times every second, meaning that additional devices can make full use of an incomplete slice of the radio spectrum. This ensures that the interference won’t take place as each transmitter (TX) will be on different frequencies.
The power consumption of the chip (consisting of the transceiver) is low, at about 0.3mW, which makes it possible for least use of battery life.
It assurances security at the bit level. The verification is controlled using a 128bit key.
It is possible to use a Bluetooth device for both transferring and verbal communication as this device can support data channels of up to 3 comparable voice channels.
It disables the limits of the line of sight and one-to-one communication as in another mode of wireless communications such as infrared.

Applications of Bluetooth

The applications of Bluetooth device include the following

Applications of Bluetooth

Cordless Desktop
Ultimate headset
Automatic synchronization
Multimedia Transfer

This article gives the information about how to connect a Bluetooth with other devices, and applications. We hope that the above information given in this article is helpful in providing some good insights and understanding of the project. Furthermore, if you have any queries regarding this article or to implement Bluetooth based projects, you can comment in the below section. Here is a question for you – What are the different versions of Bluetooth?

How Arduino Can Be Interfaced With Bluetooth Technology

April 21, 2017 by Tarun Agarwal 2 Comments

Bluetooth Technology

In this tutorial, we going to discuss how can we interface a microcontroller with the Bluetooth technology. The Bluetooth will work with an Arduino board through the serial communication. The data is received to the Arduino with the HC-05 Bluetooth module through the serial communication and the LED’s will turn ON/OFF according to the receiving data. There are different types of Bluetooth modules are available in the market, but here we are using the HC-05 Bluetooth module because it is commonly used.

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How To Make RF Based Home Automation System

March 24, 2017 by Tarun Agarwal 12 Comments

RF Based Home Automation System Project Kit

Day by day, as the technology is rapidly progressing that affect the human daily lives more flexible, especially in controlling home appliances. Electrical installations are the heart of every building, thus intelligent building control absolutely ensures the safety and efficient control and finally saves the power consumption and manpower. Home automation system does the operations such as lighting control & regulation, regulating heating, equipment’s ventilation and air con equipment, load, and energy management, audio or video systems, security and monitoring, human machine interfaces and other control tasks.

RF Based Home Automation System

To develop a home automation system with an RF controlled remote, houses are also getting smarter. As technology is advancing so houses are also getting smarter.Modern houses are gradually shifting from conventional switches to a centralized control system, involving radio frequency controlled switches.

At present, conventional wall switches located in different parts of the house make it difficult for the operator to go near them to operate.In order to complete this, an RF remote is interfaced to the microcontroller on the TX side which sends commands to the receiver where different loads are connected. By operating the particular remote switch on the TX, the loads can be switched ON/OFF remotely through wireless technology.

This circuit uses an RF module to make a wireless remote, which could be used to drive an o/p from a distance place. As the name suggests, RF module uses radio frequency to send signals, which are transmitted at a specific frequency & a baud rate.

Hardware and Software Requirements

The hardware and software requirements of RF-based home automation system include Series Microcontroller, Transformer, Opto-isolator, TRIAC, Voltage Regulator, Crystal Diodes, Resistors, Capacitors, Lamps, RF modules, Push Buttons, Keil compiler, and Languages: Embedded C or Assembly.

The essential components used to build RF based home automation system is RF TX and RX, encoder, and decoder, Optoisolator, and BC547 NPN Transistor.

RF Transmitter and Receiver

Normally, RF modules are divided into three groups, RF TX module, RF receiver module, and RF transceiver module.
433MHz, ASK transmitter and receiver are used for the remote control.

RF Transmitter and Receiver

Features of RF

The main features of RF transmitter include the following

Range in standard conditions is 100 meters
RX frequency-433MHz
Typical sensitivity-105Dbm
Supply current of RX-3.5 mA
IF frequency of RX-1MHz
Low power consumption
Easy for Application
Operating voltage of RX-5V
Frequency range of TX-433.92MHz
Supply voltage of TX- 3V to 6VO/p of TX- 4 to 12 dBm

Encoder

Encoder HT12E IC gets parallel data in the form of address and control bits
The control signals from remote switches along with 8-bits constitute a set of 12 parallel signals
The encoder converts the parallel inputs into a serial set of signals.
These signals are serially transmitted through RF to the response point.
Transmission is permitted by providing ground to pin-14 which is active low.

HT12E Encoder

Decoder

In the receiver circuit, we use an RF module to get the information and decoded by the decoder.
Decoder delivers the data into 4-bit and we use the further control circuit to switch ON/OFF.
The decoder is used after the RF receiver to decode the serial format and regain the original signals as o/ps.
This o/ ps can be observed on equivalent LEDs.

HT12D IC Decoder

Opto-isolator

Opto-coupler MOC3061 or MOC3063 a LED, SCR sort combination.
It is a 6-pin IC.
Additionally, while using this IC with a microcontroller and also LED can be connected in series with IC LED to specify when the high is given from microcontroller so that we can know that flow of current is in internal LED of the opto-IC.
When the logic high is given, then the current flow through LED from pin 1 to 2
So in this process, LED falls on SCR to cause pins 4 and 6 to close only at the zero cross of the supply voltage.

MOC3061 Opto-isolator

BC547 NPN Transistor

The transistor (BC547) is an NPN epitaxial silicon transistor
This transistor is used in general purpose switching & amplification BC847 or BC547 series 45V, 100mA NPN general purpose transistors.
The ratio of two currents ‘Ic’ and ‘Ib’ is called the C current gain of the device and is given the symbol of hfe or beta.
The current gain from the Emitter (E) to the collector terminal is called alpha.

BC547 NPN Transistor

The main goal of this project is to design a home automation system with an RF controlled remote. As day by day technology is advancing and houses are getting smarter. These houses are progressively changing from conventional switches to the integrated control system, including RF controlled switches.

Block Diagram of RF Transmitter

Presently, conventional wall switches located in various parts of the house make it difficult for the user to go nearby them to work. Even more, it becomes more difficult for the elderly or physically handicapped people to do so. The proposed system offers a simple solution with RF technology.

Block Diagram of RF Receiver

In order to get this, an RF remote is connected to the microcontroller on the TX side which sends ON/OFF signals to the RX where different loads are connected. By operating the particular remote switch on the TX, the loads can be switched ON/OFF remotely through wireless technology.

The microcontroller used here is 8051 family, the different loads are connected to the microcontroller using TRIACs and Opto-isolators.

Applications of RF-Based Home Automation System

The applications of RF-based home automation system include the following

Burglar alarm, smoke alarm, fire alarm, car alarm, security system, etc.
Car door and garage door controllers
Cordless telephone
Other remote control systems
Wireless security systems
Car alarm systems
Remote controls
Sensor reporting

Thus, this is all about RF based home automation system. We hope that you have got a better understanding of this concept. Furthermore, any queries regarding this concept or to implement any home automation projects, please give your valuable suggestions by commenting in the comment section below. Here is a question for you, What are the applications of home automation system?

How Bluetooth Module Interfacing with Microcontrollers

November 3, 2016 by Tarun Agarwal 6 Comments

Bluetooth module Interfacing with Microcontroller

In communication, the Bluetooth wireless technology has become very popular and it is one of the fastest growing fields in the wireless technology. Hence it is important to learn how the HC 05 Bluetooth module interfacing with the microcontroller. Nowadays, demands of mobile phones and personal communication the bandwidth are easy and convenient to use. The Bluetooth technology manages the communication channel of the wireless part. The Bluetooth modules can transmit and receives the data wirelessly by using two devices. The Bluetooth module can receive and transmits the data from a host system with the help of the host controller interface (HCI). The UART & USB are the most popular host controller interfaces and in this article, we have discussed the UART. By using the UART connections, the Bluetooth module can be integrated and it gives the best possible solutions for the Bluetooth embedded systems. [Read more…]

What is the MAX232 IC and Interfacing Needs

August 3, 2016 by Tarun Agarwal 14 Comments

MAX232 Interfacing

The Max-232 IC is started by the maxim integrated products in 1987. It is an integrated circuit which converts the signals from the RS232 serial port to the proper signal which are used in the TTL compatible digital logic circuits. The MAX232 can convert the signals like RX, TX, CTS, and RTS and it is a dual driver/receiver. The driver increases the output voltage levels of TIA232 from a 5 volt supply to 7.5 volts by using the external capacitor and on chip charge pumps. The receiver reduces the input levels of the TIA232 from 25 volts to the standard voltage level, i.e. 5volts of TTL levels and there is a threshold of 1.3 volts and hysteresis of 0.5 volts for the receiver. Further the max232 IC is extended by the four receivers and transmitters simultaneously with eight receivers and transmitters which are MAX238 and MAX248 and there are many combinations of receivers and transmitters.

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Block Diagram and Explanation of RF Transceivers

April 28, 2016 by Tarun Agarwal 2 Comments

RF Transceiver

Generally, an RF module is a small size electronic device, that is used to transmit or receive radio signals between two devices. The main application of RF module is an embedded system to communicate with another device wirelessly. This communication may be accomplished through radio frequency communication. For various applications the medium of choice is radio frequency since it does not need line of sight.The applications of RF modules mainly involve in low volume and medium volume products for consumer applications like wireless alarm systems, garage door openers, smart sensor applications, wireless home automation systems and industrial remote controls. This article discusses about block diagram of RF transceiver module and its applications.

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Introduction to Bluetooth Technology, its Working and its Applications

October 17, 2014 by edgefx

Bluetooth, the curiously named communication standard has taken the world by storm. Now a given feature on everything from smartphones to in-vehicle entertainment systems, Bluetooth has an interesting history and working, proving how versatile this communication standard is. It is managed by the Bluetooth Special Interest Group (SIG), a non-profit, non stock company which mainly deals with setting standards, licensing and advancing Bluetooth capabilities. Before this it was standardized by the IEEE as IEEE 802.15.1, but since the SIG, that convention is not used. Here’s more about how the wireless communication standard came to be, why it is named so, how it has grown over the years and where it is used! [Read more…]