{"product_id":"gt-521f32-finger-print-sensor-module-optical-uart-compoden","title":"GT-521F32 Finger Print Sensor Module – Optical UART | Compoden","description":"\u003ch1\u003eGT-521F32 Finger Print Sensor Module\u003c\/h1\u003e\n\u003cp\u003eThe GT-521F32 is an optical fingerprint sensor module with a built-in fingerprint algorithm and flash storage for up to 200 fingerprints. It connects via UART to microcontrollers like Arduino or ESP32, making it straightforward to add biometric authentication to access control, attendance, and security projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003eOptical (192 x 192 pixels)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFingerprint Capacity\u003c\/td\u003e\n\u003ctd\u003e200 templates\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eUART (3.3V TTL, 5V tolerant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V – 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFalse Acceptance Rate\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.001%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e56 × 21 × 21.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-servo-door-lock\"\u003eBiometric door lock with Arduino and a solenoid\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eEmployee attendance system logging to an SD card\u003c\/li\u003e\n  \u003cli\u003eTwo-factor authentication for a Raspberry Pi kiosk\u003c\/li\u003e\n  \u003cli\u003eSecure safe or drawer lock with an ESP32 and Blynk app\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe module works with any microcontroller that has a UART interface running at 3.3V or 5V logic levels. Tested with Arduino Uno, Mega, Nano, ESP8266, ESP32, and Raspberry Pi (using a level shifter if necessary). The standard baud rate is 9600 bps.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 3.3V or 5V, GND to ground, TX on the sensor to RX on the microcontroller, and RX on the sensor to TX on the microcontroller. The sensor draws about 65 mA during scanning, so avoid powering it from a 3.3V regulator that cannot supply at least 150 mA.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery 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.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes. Use the SoftwareSerial library to connect the sensor’s TX to pin 2 and RX to pin 3. The GT-521F32 operates at 3.3V logic but is 5V tolerant, so direct connection works.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow many fingerprints can the module store?\u003c\/summary\u003e\u003cp\u003eThe onboard flash stores up to 200 fingerprint templates. Each template is about 512 bytes, and the sensor’s algorithm handles enrollment and matching locally.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes it work with Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eYes. Connect UART pins directly, but use a voltage divider or level shifter on the TX from the Pi (3.3V) to the sensor (5V tolerant). Enable serial port in raspi-config and use Python libraries like PyFingerprint.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery 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.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445107450221,"sku":"CDN-0369","price":2380.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/download_9f287249-c423-47bd-be61-d49a7ddc3953.jpg?v=1781591826","url":"https:\/\/compoden.com\/products\/gt-521f32-finger-print-sensor-module-optical-uart-compoden","provider":"Compoden","version":"1.0","type":"link"}