Name: 125KHz RFID Reader Module (5V) - Standalone Access Control
Brand: Sun Cheong Computer Company Limited
SKU: 21PS002591
Price: 157.0 TWD
Availability: InStock

Short Product Description

Build your own secure access control system in minutes without complex coding. The YS-RFID2 is a standalone 125KHz RFID reader module that stores up to 40 cards internally. With a direct "High-Level" signal output, it can trigger relays and electronic locks instantly. Perfect for DIY smart home projects, cabinet locks, and STEM electronics learning. No Arduino or PC connection required for operation.

Key Features

True Standalone Operation: Internal memory stores up to 40 distinct ID cards (TK4100/EM4200 compatible) without external software.
One-Button Configuration: Register new cards or factory reset the device using the single on-board "KEY" button.
Direct Relay Drive: The output port provides a High-Level signal capable of driving a relay module directly to control high-voltage appliances.
Visual Feedback: On-board LED indicator flashes to confirm card registration, deletion, and successful reads.
Compact Form Factor: Measuring just 5cm x 2.9cm, it fits easily into small enclosures or behind panels.
Customizable Modes (Advanced): Advanced users can solder the RXD or TXD pads to GND to enable Self-Locking (Toggle) or 10-Second Delay modes.

Full Product Description

Simplify Your Security Projects with the YS-RFID2

Are you looking to add keycard security to your project but don't want to write hundreds of lines of code? The YS-RFID2 125KHz RFID Module is the ultimate "set-and-forget" solution for makers and technicians.

Unlike standard RFID readers that require a microcontroller (like an Arduino) to process data, this intelligent standalone module handles everything on-board. It features a built-in microcontroller (STC15) that memorizes card IDs, meaning it works independently once powered up.

How It Solves Your Problem

No Programming Needed: Features a simple "KEY" button on the board. Press it to register a card; long-press to wipe the memory. It’s that easy.
Direct Control: When a registered card is swiped, the OUT pin sends a High-Level (4.3V) signal. You can connect this directly to a Relay Module to unlock a door, turn on a light, or activate a motor.
Versatile Application: While it works great standalone, advanced users can modify the solder pads to change modes (Toggle Mode/Self-Lock or 10-Second Delay), making it adaptable for any scenario.

Professional Grade Reliability

Built with a TI LM258 chip and a strong anti-interference MCU, this module offers stable reading distances of up to 3cm (depending on card size). Whether you are retrofitting a garage door, building a secure storage box, or teaching students about RF technology, this module delivers consistent performance.

Technical Specifications

Model: YS-RFID2
Operating Voltage: DC 5V (Standard)
Operating Frequency: 125KHz
Supported Chips: TK4100, EM4200
Card Capacity: 40 Cards
Reading Distance: 1.5cm - 3cm (Standard Card)
Operating Current: < 30mA
Output Type: High Level (approx. 4.3V) when active; Low when inactive
Dimensions: 50mm x 29mm x 5mm
Interface: 3-Pin Header (VCC, GND, OUT)

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Q: Do I need a computer to program the cards?
A: No. This is a standalone module. You use the on-board "KEY" button to "teach" the module which cards to accept. No computer or coding is required.

Q: Can I connect this to an Arduino if I want to?
A: Yes. While it works independently, you can connect the OUT pin to an Arduino digital input pin to detect when a valid card is presented.

Q: How do I delete a lost card?
A: To ensure security, if a card is lost, you perform a "Clear All" operation by long-pressing the KEY button for seconds until the light confirms. You then re-register the remaining cards.

Target Users / Applications

DIY Hobbyists: Building smart cabinet locks or secret drawer openers.
STEM Educators: Teaching basic input/output and RF concepts without complex coding.
Technicians: Retrofitting legacy equipment with basic authentication.
Cosplayers: Creating props that activate lights/sound with a hidden tag.