RFID Reader 125KHz Proximity Reader with Serial and TTL Interface Module, for Easy Integration with Arduino, Raspberry PI and other microcontrollers.
RFID stands for Radio Frequency Identification. RFID is one member in the family of Automatic Identification and Data Capture ( AIDC ) technologies and is a fast and reliable means of identifying objects. There are two main components: The Interrogator (RFID Reader) which transmits and receives the signal and the Transponder (tag) that is attached to the object. An RFID tag is composed of a miniscule microchip and antenna. RFID tags can be passive or active and come in a wide variety of sizes, shapes, and forms. Communication between the RFID Reader and tags occurs wirelessly and generally does not require a line of sight between the devices. An RFID Reader can read through most anything with the exception of conductive materials like water and metal, but with modifications and positioning, even these can be overcome. The RFID Reader emits a low-power radio wave field which is used to power up the tag so as to pass on any information that is contained on the chip. In addition, readers can be fitted with an additional interface that converts the radio waves returned from the tag into a form that can then be passed on to another system, like a computer or any programmable logic controller. Passive tags are generally smaller, lighter and less expensive than those that are active and can be applied to objects in harsh environments, are maintenance free and will last for years. These transponders are only activated when within the response range of an RFID Reader. Active tags differ in that they incorporate their own power source, where as the tag is a transmitter rather than a reflector of radio frequency signals which enables a broader range of functionality like programmable and read/write capabilities
RFID is used for many applications such as: Automated electronic toll stations which can identify vehicles passing through without having to stop and then debits their account. Identify and monitor railcars and containers. RFID tags help farmers track their farm animals, and is used in wildlife conservation. Also helps to identify our animal companions if they should ever become lost. Customers can pay for their fuel at the pump with just a wave of their key tag. An increase in demand has been seen for security applications such as homeland security, employee identification, gaining entrance and controlling access of vehicles to buildings, gated communities, corporate campuses and airports.
Some other current uses for RFID include waste management, automating parking and managing traffic, the dispensing of all types of products, providing ski lift access, the tracking of library books and more. Major growth in the future of RFID will come from real-time location systems (RTLS), asset management, baggage handling and cash less payment systems. Business segments such as retail, logistics, warehousing and manufacturing will greatly benefit from an increase in supply chain visibility that RFID can create.
Radio waves are the carriers of data between the reader and tags. The approach generally adopted for
RFID communication is to allocate frequencies depending on application. The frequencies used cover a wide spectrum, these specified bands are:
Very long wave 9 – 135 kHz
Short wave 13.56 MHz
UHF 400-1200 MHz
Microwave 2.45 and 5.8 GHz
The allocation of frequencies is regulated by government agencies, requiring care in considering RFID applications in different countries. Efforts at standardization should avert these problems. The many varied applications will work their best at different frequencies, therefore, it is important to understand the requirements before selecting a particular type of RFID system. The most common uses of low frequency systems are in security access, asset tracking and animal identification. They generally have short reading ranges and lower system costs. High-frequency systems are used for such applications as railroad car tracking and automated toll collection. They offer long reading ranges and high reading speeds. This higher performance usually entails higher costs. The power level of the interrogator and the power available within the tag to respond will determine the reading range that can be achieved in an RFID system. Like the restrictions on carrier frequencies there are legislative constraints on power levels. Environmental conditions, particularly at the higher frequencies, can also influence the range of communication.
The early 20th century saw the beginning of modern radio communication. The convergence of radar with the ability to broadcast radio led to the idea for Radio Frequency Identification. Even though one of the first papers exploring RFID was written in 1948, it would take the development of other technologies before RFID could become practical. One of the first commercial applications was electronic article surveillance (EAS) as a way to curtail theft. The possibility of using RFID as a tracking device led many companies to build systems for this purpose. The desire by highway transportation authorities to see traffic move quicker through toll booths saw the invention of electronic toll collection systems and the need to limit access to certain areas also drove the development of RFID.
This is a Passive RFID Reader
• Sensitivity Range is about 6cm from antenna.
• External Antenna or Internal antenna.
• Buzzer to detect the proximity cards.
• Blue LED blinking to show that the RFID reader is powered on.
• Direct TTL output that can be directly coupled with most of the microcontrollers without max232.
• Operates at 5v with 500ma of current.
• It has an RFID Reader Chip
• Cypress Microcontroller to decode the data into Serial o/p.
• Rs232 to convert signal into TTL to RS232 (optional).
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