Introduction: DIY RFID Card Reader

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RFID stands for Radio Frequency Identification a term that refers to technologies that use radio frequencies to identify objects. RFID has been used in a number of practical applications in many industries, such as improving supply chain management, tracking household pets, accessing office buildings, and speeding up toll collection on roadways. Being so useful & productive they do have a couple of shortcomings, such as not being cost effective to buy & repair due to the complex nature of the embedded MCU (microcontroller units) in RFID receivers. So in this project, we are going to go over a step by step procedure on 'How to make an RFID Card Reader Without Using An Arduino' or any other kind of microcontroller.

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PCB Prototype 2$

Step 1: Hardware Required

  • Comparator IC LM324
  • NPN Transistor BC494, 2N2222
  • Buzzer
  • Variable Capacitor 33pF
  • Enameled Copper Wire 25/16 gauge
  • Pushbutton
  • Zener Diodes 1N4148
  • LED
  • Capacitor 10pF, 82pF, 27pF, 100uF
  • Resistors 82K, 1K, 2.2M, 100K

Step 2:

Solder the 10pF & 82pF capacitor parallel to the 82KOhm resistor.

Step 3:

Solder the 1K resistor in series to the 82pF capacitor.

Step 4:

Coil the 25 guage copper wire till 6 turn & solder one end with the collector of the transistor & other with the 27pF capacitor.

Step 5:

Solder the pushbutton & the coin cell on the Veroboard.

Step 6:

Solder the LM324 Comparator IC on the Veroboard. after that, solder a 100uF capacitor between pin 4 (+ve) & 11 (-ve) of the IC.

Step 7:

Connect 2.2M Ohm resistance between pin 1 & 2 of the IC. After that attach a 100K resistor between pin 2 & pin 3 of the IC.

Step 8:

Solder a 33pF variable capacitor between pin 2 & 3 of the IC & a 10pF capacitor in series to the variable cap.

Step 9:

Connect the +ve pin of the LED on pin 1 of the IC. Connect the base of the 2n2222 transistor to the -ve terminal of the LED with a 1K resistor.

Step 10:

Connect the -ve terminal of the 5V buzzer to the collector of the
transistor & connect the +ve terminal to the +ve of the 1N4148 zener diode.

Step 11:

Connect a coil of 25 guage copper wire between the 10pF capacitor & the emitter of the transistor.

Step 12:

Connect the +ve of the battery to pin 4 of the IC & -ve to the pin 11.

Step 13:

Power up & test the circuit