ZW101 / ZW111 Integrated Fingerprint Sensor Module
= Low-Power Semiconductor Fingerprint Module for Arduino and Embedded Systems =
The ZW101 and ZW111 are lowpower, highperformance semiconductor fingerprint modules from Hi-Link (HLK) . They integrate a fingerprint sensor with a DSP processor into a compact design for biometric security applications.
UltraLow Power Consumption Sleep current as low as 8uA (ZW111) for battery-powered devices.
HighResolution 500DPI Sensor Captures clear fingerprint images with 88x112 pixels for reliable recognition.
Operating voltage is 3.3V DC - ensure a stable power supply .
Connect via serial UART (TTL) - use Arduino's SoftwareSerial or hardware serial pins .
Do not connect the module to 5V directly without level shifting unless specified .
= Technical Specifications =
| Parameter | ZW111 | ZW101 |
|---|
| Sensor Resolution | 88 x 112 pixels | Not specified |
| Storage Capacity | 40 fingerprints | 50 fingerprints |
| Module Size | 21 x 21 x 5mm | Not specified |
| Sleep Current | 8uA | 25uA typical |
| FRR | <3% | Not specified |
| FAR | <0.0001% | Not specified |
= Key Features =
Semiconductor Active Capacitive Sensing - Captures fingerprint ridges and valleys electronically, immune to light interference .
Integrated Finger Detection - No external touch detection chip needed (ZW111) .
Flexible Interface - UART serial communication for easy integration .
Low Power Modes Supports deep sleep for batterypowered projects .
Compact Modular Design Small form factor ideal for spaceconstrained applications like smart locks and doorbells .
== Applications ==
- Smart door locks and access control systems .
- Biometric attendance and security systems .
- Arduino and Raspberry Pi projects .
- Portable safes and personal authentication devices .
Affordable Biometrics - Priced under $3.00 per unit for volume orders .
High Integration - Combines sensor and processor on a single board, simplifying design .
√ Compatible with Arduino and Raspberry Pi via UART .
√ Available in single module or test kits with cables and serial adapters for easy testing .
√ Offers a competitive alternative to traditional optical fingerprint sensors .
= Troubleshooting =
Module not responding:
- Verify 3.3V power supply and stable current (>100mA) .
- Check UART connections (TX ↔ RX, RX ↔ TX) .
- Ensure common ground between module and microcontroller .
Enrollment fails with error code 0x26:
- This indicates poor fingerprint image quality .
- Clean the sensor surface with a soft cloth .
- Ensure finger is placed correctly and held steady for the scan .
Automatic registration timing issues:
- The module needs to be in "waiting" mode before a finger is placed, not before sending the command .
- Consult the module's protocol specification for the exact command flow .
This product description is based on specifications from the manufacturer (Hi-Link) and community documentation . Always verify pinout and voltage levels for your specific module version.
