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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26 Mar 2017: 08:07 AM
Hi Ajay,

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


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Tue Jul 25 2017, 10:59 AM
i want few tips to learn to become an expert in embedded systems ...?anybody is there to help me?
Sun Jul 23 2017, 04:13 AM
Sir, I wants to make a digital clock with RTC using AT89C51 or AT89C2051 and seven segment led. Sir will u help me?
Sat Jul 22 2017, 11:42 AM
I wnt to learn embedded could anyone help me
Sat Jul 22 2017, 11:41 AM
Wed Jul 12 2017, 09:04 AM
Any good guides on how to interface an 8255 w/ an 8051?
Tue Jul 11 2017, 12:52 PM
i need seconds added to this circuit, can you help me modify it and add codes too
Wed Jul 05 2017, 07:55 PM
@martinsnc115877 The hex file is here
Sun Jul 02 2017, 10:58 AM
sir, sorry for the disturbance I can find the small and capital letter,hex file, please send it to me
Sun Jul 02 2017, 06:15 AM
Sam Raj
Can I have the circuit of Simple Digital Voltmeter using 8051
Sat Jul 01 2017, 08:39 PM
Read this The project download contains lower case letters. It is compiled in Keil



Tue Jul 25 2017, 07:12 AM
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Fri Jul 21 2017, 01:44 PM
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Tue Jul 11 2017, 01:55 AM


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