Radio frequency identification, RVIo Frequency Identification, RFID, is one of the automatic identification technology, performs non-contact bidirectional data communication by radio frequency mode, reading the recording medium (electronic tag or radio frequency card) using a radio frequency mode Write, thus achieving the purpose of identifying targets and data exchange, which is considered to be one of the most developed information technology in the 21st century.
1, RFID wireless identification system circuit + program + paper
This wireless recognition device (RFID) is combined with a discrete component. The passive slave operation method is fully considered, using the slave to the host's impedance modulation, using the ASK sending data, plus reliable data coding and error correction algorithms, and implements efficient transmission of data. This system fully considers the impact of the coil on the high-frequency carrier in the title, which uses a carrier of 2.4576m, which can effectively couple the energy of the reader to the transponder, and can also accurate the digital information of the transponder. Transfer to the reader. In terms of readers, we use active crystals to generate high stability carriers, effective coupling of energy efficient transmission and information. In terms of transponder, we use a parallel resonant loop to collect energy, with a small pressure difference of Schottky diode rectification, ultra-low power MCU ATTINY 13 as a controller, try to minimize the power consumption of the transponder, energy Utilization is highly utilized. In terms of data transmission, we use the method of transmitting data after the first charge, plus efficient algorithm filtering, which greatly increases the stability of the transmitted data.
Indicator: The maximum distance can be 100% in the case of 14cm in the case of 14 cm, and the power is 1.2W.
Project link: www.cirmall.com/circuit/3680
2, based on RFID RF module RC522 RF card development application
The MF522-AN module uses the Philips MFRC522 original chip design read card, applied to high integration of high integration in 13.56MHz non-contact communication, is a low voltage, low cost, low cost, "three tables" applications for NXP. Small non-contact read and write card chips. The module uses a voltage of 3.3V. You can directly connect communication with any CPU motherboard with the user through the SPI interface. You can ensure that the module is stable and reliable, and the card is far away;
Project Link: https://www.cirmall.com/circuit/1344
3, based on STM32 single-chip smart RFID card car bit lock design [full information]
This design is composed of STM32F103C8T6 single-chip core board + LCD1602 liquid crystal display circuit + RFID module circuit + button circuit + relay circuit.
1. Relay simulates the parking lock switch (similar to the front of the vehicle), and the closure does not allow other vehicles to enter in the normal case, and if the card success relay is disconnected, the vehicle will enter.
2, after the vehicle is entering, the button will open the relay again, open the car, so that the car is locked in the parking space.
Project link: https://www.cirmall.com/circuit/14604
4, graduation design - "STM32 single-chip radio RFID number count system 93- (PCB + source + circuit diagram + paper)
Product function description:
This system consists of STM32F103C8T6 microcontroller core board, RFID radio frequency swipe module, button, LCD1602 LCD screen, and ULN2003 Stepper motor drive module.
1. Test whether the corresponding person is swiping in real time through the RFID radio frequency swipe module, and the person is divided into A, B, and C.
2. If the count of the person's credit card will be accumulated, the number of people will be credited to the card.
3. After the file is swipped, the motor drives the person to open the person through the automatic shutdown. Whether the opening process is still closed, when reading the credit card operation, the stepper chance action means that the gate is turned on, followed by shutting down the gate. When the step motor suddenly needs to open during the closed process, the shutdown is stopped and turned on, which is the anti-pin function.
4, LCD1602 LCD real-time display of the A / B / C overall credit card; if the button is pressed, all the swivers pass the number of times.
Project Link: https://www.cirmall.com/circuit/17790
5, STM32 RFID Intelligent Access Control System Design (with source code + schematic + PCB and other materials)
Hardware composition:
STM32F103 microcontroller + LCD1602 LCD display + RC522 RF card + buzzer alarm + function button + relay module
Function description
1. LCD1602 LCD display current information
2. Press to register, delete, return to the current IC card
3. After the registration is successful, the credit card success relay is opened.
4. Sensing the buzzer reminder after IC card
Project Link: https://www.cirmall.com/circuit/17519
6, single-chip RFID IC card access control system (circuit + simulation + program)
Function status description:
1. Single-chip + button + IC read-write module + DS1302 + LCD1602 LCD design
2. The liquid crystal can display the current time in real time, so that the user is used, with the power-off time function.
3. You can add or delete the memory function of the IC card, so that users are more flexible.
4. With the dual prompt function of the indicator and buzzer, the green light indicates that the red light indicates that it is prohibited.
5. Relay simulates electronic lock, closed state is an unlocking state, and it is indiscriminate.
Project Link: https://www.cirmall.com/circuit/9491
7. Design based on RFID non-contact temperature measuring instrument
In response to the inconvenient, accuracy of the contact detection temperature in life, industrial production, the application range is small, the application range is strict, and the design plan for the wireless RF temperature measurement system is proposed. Detailed description of the design ideology and implementation of non-contact temperature test systems, specifically analyzes the design principles of each part, detail
The design process of each part. The RFID non-contact temperature test system consists of three parts of the temperature acquisition portion, the data wireless transmission section, and communication. The temperature acquisition portion utilizes the single-chip STC89C51 as the control center, and the acquired temperature value is sent to the microcontroller for data processing by using a line-like digital temperature sensor DS18B20; the data wireless transmission portion uses RFID technology-based wireless radio frequency transceiver chip NRF2401, through software configuration Wireless high speed transmission of data.
Project Link: https://www.cirmall.com/circuit/5929
8, RFID access control system code + PCB + flow chart + papers + reference materials
1. User password and IC card number and IC card password, saved to the EEPROM of STC12C5A60S2, implement power-down data save functions.
2. Support for non-contact IC card license functions, which can be authorized to authorize (authorized to enter the administrator password program default "000").
3, support the hand-entered card pin card, support single card brush into the sales card, support all cards (logout all cards must enter the administrator password program default "000")
4, automatically identify non-contact IC card functions. If the IC card passed by the brush, "Welcome", display the card number and open the door, and automatically close 5 seconds. If the unauthorized IC card, prompt "The card is not authorized", the display card number does not open the door.
5, if you forget to carry the IC card, you can manually enter the user password by the keyboard, and the program defaults to "000000". Password input error, the display will incorrectly prompt and the relay does not work (no door); if the password is entered correctly, the relay works (open the door).
6, support manually change user password (change user password to enter administrator password programs default "000")
7, support standby clock display function (function: show the day and month, the lunar calendar, the sky, the zodiac, the temperature, change time, with the power-off time function)
Project Link: https://www.cirmall.com/circuit/2620
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Source: Circuit City
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