diy rfid reader part no. 2171057 - jameco electronics · diy rfid reader part no. 2171057 the diy...

DIY RFID Reader

PART NO. 2171057

The DIY RFID reader allows you read any EM4100 compatible tags. The RFID reader needs to be energized with a regulated 5V DCvoltage (you can use a 7805 voltage regulator, Jameco P/N: 51262). Once the reader is energized, it is ready to read the UID fromthe compatible EM4100 Tag (Card, key fob, etc). The reading distance is about 7 cm. So when the tag is placed into the readingdistance, the reader gets the tag's UID and then transmits it through serial interface at 9600 bps, 8bits, No parity and 1 stop bit. Thisserial interface is TTL true level, that means high level is 5V and low level is 0V.

Time Required: 1 to 1.5 Hours depending on experience

Experience Level: Intermediate

Required tools and parts:

Soldering iron6" general-purpose shearcutterHeat gunSolderTransparent tape or masking tape22 AWG solid wire (2 pieces of 5 cm lenght)Heat shrink tube 3/32" of diameter (2 pieces of 2 cm lenght)Small piece of sandpaper

Bill of Materials:

Qty Jameco SKU Component Name

1 312514 MCU 8-Bit PIC12 RISC 3.5KB Flash 5 Volt 8-Pin Plastic Dip Tube

1 120862 OP Amp Dual General Purpose Â±15 Volt 30 Volt 8-Pin Plastic Dip Tube

1 178597 TRANSISTOR General Purpose BJT NPN 40 Volt 0.2A 3-Pin TO-92

1 178618 TRANSISTOR,2N3906,PNPSIL,GP,TO-92

1 179215 Diode Switching 100 Volt 0.3A 2-Pin DO-35

1 93761 CAP,RADIAL,100uF,25V,20%,85C 6mmX11mm

4 25523 CAP,MONO,.1uF,50V,20%

3 15190 CAP,CERM,DISC,.001uF,50V,20%

1 15413 CERM,DISC,220pF,50V,20% 10 TO 85 DEG

1 1947407 CAPACITOR,CERAMIC,DISC,.0033UF,500V

2 690806 RESISTOR,CARBON FILM,560 OHM,1/4 WATT,5%


3 2156084 RESISTOR,CARBON FILM,100K OHM,1/4 WATT,5%





1 112206 SOCKET,IC,08PIN,DUAL WIPE,SOLDERTAIL,LOW PROFILE(10)0.30 INCH WIDTH

3 68339 Connector Unshrouded Header 36 Position 2.54mm Solder Straight Thru-Hole

It only needs 3 pins not all the header. That is the reason the quantity required is 3.

1 2119355 WIRE,MAGNET,28AWG,520 FEET,1/4LB,PLAIN ENAMEL,NYLON INSULATED

We don't need all the entire coil. We only need 41 feet to build the antenna.

Step 1 - Review the parts

Prepare your work area and take a moment to be sure you have all the required parts

Step 2 - Solder R1 and R2

Solder the resistors R1 and R2 to the board in the designated spot. These resistors are 560 ohms (Green, blue, brown).

Step 3 - Solder R3 resistor

Continue soldering the R3 to the board in the designated spot. This resistor is a 10 ohm resistor (Brown, black, black).


Solder the R4 resistor to the board in the designated spot. It's a 100 Kohm resistor (Brown, black, yellow).


Solder R5 resistor to the board in the designated spot. It's a 10 Kohm resistor (Brown, black, orange).

Step 6 - Solder R6 resistor.

Solder R6 resistor to the board in the designated spot. It's a 100 Kohm resistor (Brown, black, yellow).


Solder R7 resistor to the board in the designated spot. It's a 22 Kohm resistor (Red, red, orange).


Solder R8 resistor to the board in the designated spot. It's a 270 ohm resistor (Red, violet, brown).


Solder R9 resistor to the board in the designated spot. It's a 1 Kohm resistor (brown, black, red).

Step 10 - Solder Resistor R10

Solder R10 resistor to the board in the designated spot. It's a 100 Kohm resistor (Brown, black, yellow).


Solder R11 resistor to the board in the designated spot. It's a 10 Kohm resistor. (Brown, black, orange).

Step 12 - Solder the D1

Solder the D1 diode to the board in the designated spot. Watch the polarity!

Step 13 - Solder the LM358

Solder the LM358 to the board in the designated spot IC2. Watch the position of the notch!

Step 14 - Solder the socket

Solder the socket to the board in the designated spot IC1. Watch the position of the notch!

Step 15 - Solder the 220pF capacitor

This capacitor is label with 220. Solder this capacitor to the board in the designated spot C3.

Step 16 - Solder the 0.1uF capacitors

These capacitors are label with 104. Solder these capacitor to the board in the designated spots C2, C6, C8 and C10.

Step 17 - Solder the 0.001uF capacitors

Solder the 0.001uF capacitors to the board in the designated spots C5, C7 and C9. These capacitors are label with 102.

Step 18 - Solder the transistors

Solder the transistors 2N3904 and 2N3906 to the board in the designated spots Q1 and Q2 respectively. Solder the Q1 (2N3904) firstand then Q2 (2N3906).

Step 19 - Solder the header

Solder the 3-pin male header to the circuit board such that it is pointing down from the underside of the board. This header isdesignated in the spot J1.

Step 20 - Solder the 3.3nF capacitor

Solder the 3.3nF capacitor to the board in the designated spot C4. This capacitor is label with 332.

Step 21 - Solder the electrolytic capacitor

Solder the 100uF electrolytic capacitor to the board in the designated spot C1. Watch the polarity!

Step 22 - Insert the pre-programmed microcontroller

Insert the microcontroller PIC12F683 into the IC1 socket such that notch in the chip lines up with the notch in the socket. Watch theposition of the notch!

Step 23 - Cut the leads

Using the shearcutter, cut the leads on the bottom side of the board.

Step 24 - Wind the wire magnetic

Wind 66 turns of wire magnetic on the plastic tube. Leave 5 cm leads.

Step 25 - Take the coil (antenna) out

Once done, take the coil out of the tube, very carefully.

Step 26 - Hold the antenna

Take a small pieces of transparent tape or masking tape and wrap them on the coil to hold it as shown in the pictures.

Step 27 - Remove the coat

Using the small piece of sandpaper, remove the coat in the end of the antenna leads.

Step 28 - Solder the 22 AWG wire to the antenna leads

Solder the 2 pieces of 22 AWG wire to the leads of the antenna.

Step 29 - Insert heat shrink tube

Insert the 2 pieces of heat shrink tube to the wires and cover the junction. Use the heat gun to shrink the tube.

Step 30 - Solder the antenna to the board

Solder the antenna to the board in the designated spot J2.

diy rfid reader part no. 2171057 - jameco electronics · diy rfid reader part no. 2171057 the diy...

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