Many times people have asked me if its possible to make an RFID reader, I said yes but its complicated and recommend go for an RFID module instead. The complication includes not only the hardware but also the software part. The project utilizes a PIC16F628A with an on-chip comparator in order to feed the output from the op-amp directly into the PIC and extract the digital signal from an RFID card reader.


RFID Reader using PIC Microcontroller


The use of PIC16F628A is for more efficient signal reading by using interrupt based compare capture module since it is provides 150kHz carrier signal generation. Changing the values of capacitance causes the frequency of the entire system to be fine tuned. This is made possible using the function generator to sweep for the peak output observed with the scope where the capacitor size is altered until the peak response of the resonance circuit is at 150kHz.

The op-amp used in the project is TL062 with a simple diode detector. The detected voltage goes through the first op-amp configured as an inverting amplifier with low pass frequency response which will remove bulk of the carrier frequency. Extracting the FSK signal is the next stage of analog circuit which is a resonant band pass circuit with a center frequency.

The capture hardware shares resources with the PWM module that generates the 150kHz carrier signal, and only one function activates at a time.

For complete information on this project Read More here
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Comments

kirangowle
26 Mar 2017: 08:07 AM
Hi Ajay,

I think above download links are not working. Can you please check.

Thanks
Kiran
  

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Conversation

Fri Sep 29 2017, 02:45 AM
Maaz
i am doing the same project on verilog please contact me [email protected]
Wed Sep 20 2017, 12:36 AM
Ted
In a missing pulse detector using a 555 timer connected as a monostable vibrator with a PNP transistor,how does the positve input pulse turn on the PNP transistor?
Sun Sep 03 2017, 02:29 PM
martymarty
How do I connect an <NOKIA 1100 LCD > to an atmega328P ?
poojab51296
Sun Aug 20 2017, 10:23 AM
i am intending to interface sd card with STM32F4 and want to write a file in sd card using SPI protocol but using HAL only. Can anyone help me PLEASE!!!!
poojab51296
Sun Aug 20 2017, 10:22 AM
hello
rawat742
Fri Aug 18 2017, 11:37 AM
hi @ angel patel i will attach a file i hope it will be helpfull for you
ExperimenterUK
Mon Aug 14 2017, 09:57 PM
@ angel patel... just log in and post your problem
Mon Aug 14 2017, 01:45 PM
angel patel
hey any one help to make the led scrolling display
desuza6
Sat Jul 29 2017, 07:09 AM
I see the code for step motor h l 298 to rotate 45 degree, but all delay time, if I want to input sensor to h the pulses to stepmotor
rammichael
Thu Jul 27 2017, 12:05 PM
okay fine

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