Are you fascinated by the world of wireless and wondered how they worked? In the days before the advent of smart phones where WIFI and 3G/4G technology have become commonly available, simple infra-red and frequency modulation projects were the interesting projects for electronics enthusiasts.
Constructing these projects help to provide a good understanding and concept on the world of remote controls. The projects suggested will enable you to learn in greater details the concept of infrared, RFID and the principles of operation.
RFID Application and Design
This project provides the basic of RFID and the application in the frequency range of 13.56MHz.
This project provides the basic of RFID and the application in the frequency range of 13.56MHz.
A typical RFID system consists of a transponder where a microchip with an antenna is embedded in an item. A reader with antenna is used to read data or write data to the transponder wirelessly. The data read is then passed to a computer where it is used for business transactions.
A study by IDTechEx shows that the market for RFID application in the year 2011 was USD6.51 billion and expected to hit USD7.67 billion in 2012. In the past, the cost of RFID tags was an obstacle to its use in mass quantity. However, as the wireless technology becomes more readily available and cheaper due to its demand in the global market, its use is expected to rise at a rate not imagined before.
There are basically 2 types of RFID in use today. They are passive and active types with frequency ranging from 125kHz to2.45GHz.
Passive Type
The passive tags do not have any transmitter and obtained its power supply from the electromagnetic waves emitted by the reader. This type of tags are cheaper and could range from 15 cents to 50 cents and require minimal maintenance. They have operational range of a few inches to 30 feet. The frequency used can range from 125kHz to 2.45GHz depending on the applications but usually lower frequencies components are cheaper. Passive tags are used in retail business and manufacturing processes.
Active Type
The active tags have transmitter and its own power source. The power source can be solar energy, batteries or from other sources. The transponder is able to communicate with the reader without getting the power supply from the reader. The range of communication is from 60 feet to 300 feet with higher frequencies used. Frequencies used are 455MHz to 5.8GHz.
The application of active type is in large inventory assets control and containers where they need to be tracked over a larger area or distance. Another application is in electronic toll collection system where the transponder will be active when it received a signal from the reader. It then communicates with the reader and do the necessary transactions after which it will go back to sleep or idle mode. In this way, the lifetime of the batteries used in the transponder is extended.
IR Remote Control Transmitter
This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers, car door controllers, security systems and other remote control applications.
Infrared Remote Control Decoding Project
This project based on Microchip 16C57 microcontroller decodes infrared remote control signals from television, VCR, air conditioner or other home appliances handset that uses NEC 6121 infrared format
This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers, car door controllers, security systems and other remote control applications.
Infrared Remote Control Decoding Project
This project based on Microchip 16C57 microcontroller decodes infrared remote control signals from television, VCR, air conditioner or other home appliances handset that uses NEC 6121 infrared format
Thanks & regarded
Nipul Prajapati
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