Monday Kids RFID Reader Wireless Module UART 3Pin 125KHz Card Reading EM4100 8CM DC 5V for IC Card PCB Attenna Sensor Kits Arduino

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  • Brand Name: Monday Kids
  • Application: Computer
  • Model Number: RFID Reader/Writer Wireless Module
  • Condition: New
  • Operating Temperature: -20~70 Celsius
  • Type: Logic ICs
  • Dissipation Power: none
  • is_customized: Yes
  • Supply Voltage: DC 5V
  • Interface: Wiegand, UART
  • Support : 125KHz card reading
  • Current: 40mA
  • Voltage: DC 5V
  • Current: 40mA
  • Size: 47*26*5mm


7941E card reader module, integrated high performance card reading radio frequency circuit and antenna and users can select UART interface. Rich application support, it supports various cards card reading operation


1>. Voltage: DC 5V

2>. Current: 40mA

3>. Support 125KHz card reading

4>. Interface: UART

5>. Size: 47*26*5mm

6>. Operating Temperature: -20~70 Celsius

7>. EM4100 Card Reading Distance: >8cm

3.Connection Introduction:

1>.Power: DC 5V power supply, choose linearity power can gain better effects

2>.D1 D0:data output DATA1, DATA0

3>.FOR: NC

4. Interface Output Introduction:

1>.UART Interface Output

UART Interface Output

Data Head


Card Type

Card Type

BCC Check

Data End





XOR Check Except Data Head And Data End


2>.Card Type:

0x02 EM4100

0x01 MIFARE 1K

0x03 MIFARE 4K

0x10 HID Card

0x11 T5567

0x20 2nd Card

0x21 Monday KidsO14443B


0x30 15693 Label

0x50 CPU Card

0x51 Sector Information

0xFF Keyboard Data

For example: the data received by serial port tool is 02 0A 02 2E 00 B6 D7 B5 F2 03, then

The first byte 0x02 means data start
The second byte 0x0A means the whole data length is 10 bytes, which includes data start and data end

The third byte 0x02 means the card type is EM4100

The fourth to eighth byte (0x2E 0x00 0xB6 0xD7 0xB5) means the read card number, and the fourth byte 0x2E is hidden card number

The ninth byte 0xF2 means BCC check of second byte to eighth byte

The tenth byte 0x03 means data end


Keep away from interference source, and strong interference signal may affect card reading

Select linearity power can improve the card reading distance and effect; switch power may attenuate the distance but will not influence normal operation

The module can operate normally in the range of 3-5V, please do not use higher voltage

This module has high frequency signal, so it may cause some interference to the analog circuit. Uses should place the module a little far away from the buzzer; if the distance is too close, the sound of the buzzer will be low


1>.Attendance Fingerprint Read Write Module

2>.Entrance Guard Intercom Read Write Module


4>.Attendance fingerprint card reader module

5>.Entrance guard intercom card reader module

  • Unit Type: piece
  • Package Weight: 0.03kg (0.07lb.)
  • Package Size: 15cm x 12cm x 10cm (5.91in x 4.72in x 3.94in)

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