JT308 125KHz USB RFID Card Reader Module – Proximity Sensor
JT308 125KHz USB Proximity Sensor Smart RFID ID Card Reader Module – Reads EM4100 Tags
The JT308 is a USB plug-and-play RFID reader module designed for 125KHz proximity cards and key fobs. It reads standard EM4100 compatible tags and outputs the ID as keystrokes, making it ideal for access control, attendance logging, and DIY security projects. No drivers are needed; simply connect it to a computer or microcontroller USB host port and it works immediately.
Key Specifications
| Specification | Value |
|---|---|
| Operating Frequency | 125KHz |
| Interface | USB (HID Keyboard Emulation) |
| Read Range | Up to 5 cm (depending on tag) |
| Supported Tag Types | EM4100, EM4200, compatible 125KHz tags |
| Operating Voltage | 5V DC (via USB) |
| Output Format | 10-digit decimal or 8-digit hex (configurable) |
What You Can Build With This
- RFID door lock system using Arduino or Raspberry Pi
- Employee attendance tracker with Python and a database
- Inventory management by tagging items with EM4100 stickers
- DIY access control for lab equipment or tool cabinets
Compatibility
This reader works with any USB host, including Windows, Linux, Mac, Raspberry Pi, and Android devices with OTG support. For microcontroller projects, use a USB host shield (e.g., for Arduino Uno) or a board with native USB host like Arduino Due or Raspberry Pi Pico. It operates at 5V and draws power directly from the USB bus.
Wiring Notes
The module has a standard USB-A connector; just plug it into a free USB port. If integrating into an embedded project without USB host, you'll need a USB host controller module. Avoid connecting it directly to UART pins; it communicates as an HID keyboard.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Raspberry Pi?
Yes, plug it into any Raspberry Pi USB port; it will act as a keyboard and send the tag ID as keystrokes into your script or terminal.
Can it read 13.56 MHz NFC tags?
No, this reader only works with 125KHz EM4100 protocol tags. For NFC, you would need a 13.56MHz module such as PN532.
Does it need an external power supply?
No, it draws power from the USB port (5V, around 30mA) and requires no additional power source.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items