NFC Fingerprint Relay Control Module – Car & E-Bike DIY

SARY SY-230D NFC Fingerprint Dual-Channel Relay Control Module

Upgrade your car door, electric bicycle, or custom DIY access project with the SARY SY-230D — a versatile two-channel relay control board that accepts three convenient authentication methods: smartphone NFC, fingerprint scan, and 13.56 MHz IC card. With 10 selectable relay operating modes, adjustable delay timing, and a wide DC 10V–120V input voltage range, this compact module is the perfect centerpiece for any smart access or vehicle modification build.

Key Features

• Triple Authentication: Unlock via NFC-enabled smartphone, registered fingerprint, or 13.56 MHz IC card — choose the method that suits the moment.
• Large Storage Capacity: Stores up to 300 fingerprints and 100 IC cards, making it ideal for shared vehicles, workshops, or multi-user installations.
• 10 Relay Control Modes: From simple momentary pulse to advanced admin/user role separation — select the mode that matches your application.
• Adjustable Timing: Relay delay and waiting times are fully programmable to fine-tune your access control behavior.
• Wide Voltage Compatibility: Operates on DC 10V to DC 120V, compatible with most automotive and electric bicycle electrical systems.
• Dual-Channel Output: Two independent relay outputs allow simultaneous or sequential control of multiple circuits (e.g., door lock + ignition). An optional third relay is available separately for advanced setups.
• 3V Signal Interface: Built-in 3V logic output for integration with additional control circuits or indicators.
• Visual Mode Indicator: Blue LED blink count clearly identifies the active relay mode (1–10 blinks = Mode 1–10) for easy configuration in the field.

Technical Specifications

Relay Mode Overview (Blue LED Blink Count)

• Mode 1 (1 blink): Successful authentication triggers Relay 1 (0.5 s pulse) then Relay 2 (0.5 s pulse) on the second scan. 3V interface activates/deactivates accordingly.
• Mode 2 (2 blinks): First scan latches Relay 1; second scan connects Relay 2 momentarily (releases when finger/card is removed); third scan unlatches Relay 1.
• Mode 3 (3 blinks): Admin card/fingerprint toggles Relay 1 (latch); user card/fingerprint pulses Relay 2 (0.5 s).
• Mode 4 (4 blinks): Admin card/fingerprint toggles Relay 1; user card pulses Relay 2 (0.5 s); user fingerprint pulses optional Relay 3 (0.5 s).
• Mode 5 (5 blinks): Admin toggles Relay 1 (and resets Relay 2 on off-scan); user card toggles Relay 2; user fingerprint pulses optional Relay 3 (0.5 s).
• Mode 6 (6 blinks): Any valid authentication simultaneously pulses both Relay 1 and 2 (0.5 s).
• Mode 7 (7 blinks): Any valid authentication simultaneously latches/unlatches both Relay 1 and 2.
• Mode 8 (8 blinks): Valid scan activates 3V output → 1 s wait → Relay 1 pulse (0.5 s); second scan (or failed fingerprint) pulses Relay 2 (0.5 s) + 3V off after 5 s.
• Mode 9 (9 blinks): Admin scan: 3V output → 1 s wait → Relay 1 pulse (Relay 3 on); user scan: Relay 2 pulse (0.5 s) + 3V off after 5 s (Relay 3 off).
• Mode 10 (10 blinks): Admin: Relay 1 pulse (0.5 s); user card: Relay 2 pulse (0.5 s) + 3V off after 5 s; user fingerprint: Relay 3 pulse (0.5 s).

Smartphone NFC Setup Notes

Android: Enable NFC in phone Settings, then create a blank virtual card in your device's Wallet or NFC app before scanning.

iPhone: Add a transit card or bank card to the Apple Wallet app. Transit cards must be topped up (recharged) before they can be sensed by the module.

Typical Applications

• Car door lock modification / keyless entry retrofit
• Electric bicycle (e-bike) ignition or lock control
• DIY smart gate, cabinet, or locker access systems
• Multi-user shared vehicle or workshop access control

Note: Relay 3 is not included in the standard package. It is only required for advanced multi-relay modes. For standard car door or e-bike modifications, Relay 3 is not needed.

For general guidance on electrical safety when working with automotive or low-voltage DC systems, refer to the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Programmable logic controller

Frequently Asked Questions

Q: Is this NFC relay module compatible with both Android and iPhone?

A: Yes. Android phones require NFC to be enabled and a blank virtual card created in the Wallet app. iPhones need a transit card or bank card added to the Apple Wallet app; transit cards must be recharged before use. Once configured, both platforms can trigger the relay via NFC.

Q: What vehicles or systems can I use this relay control board with?

A: The SARY SY-230D is designed for a wide range of 12V–120V DC applications including car door lock retrofits, electric bicycle access control, DIY smart locks, gates, and cabinets. Its broad input voltage range (DC 10V–DC 120V) makes it compatible with most automotive and e-bike electrical systems.

Q: How many users can be registered on the module?

A: The module supports up to 300 fingerprint profiles and up to 100 IC cards, allowing flexible multi-user access for shared vehicles, workshops, or family use.

Q: Is Relay 3 included in the package, and do I need it?

A: Relay 3 is not included and must be purchased separately. For the most common use cases — car door modification and electric bicycle access control — only Relay 1 and Relay 2 (both included) are required. Relay 3 is only needed for advanced multi-channel configurations (Modes 4, 5, 8, 9, and 10).

Q: Can I adjust the relay timing on this control board?

A: Yes. Both the relay delay time and the waiting time between authentication events are adjustable, giving you precise control over how long the relay stays engaged and how quickly it resets for your specific application.