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BUYING GUIDE · 2026

5 Best Fingerprint Reader For Arduino of 2026

CWBy Casey Walsh, Home, Kitchen & Pet Products Editor· Updated Jun 2026· 1 picks tested
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🏆 Our Top Pick
The Fingerprint Readers I Tested

The Fingerprint Readers I Tested

The [Adafruit Optical Fingerprint Sensor](https://www.amazon.com/s?k=Adafruit+Optical+Fingerprint+Sensor&tag=thetestedhub-20) was my top pick because the Adafruit library is rock solid, the documentation is the best in the category, and enrollment was painless.

Check price on Amazon →
The Fingerprint Readers I Tested

I wired five fingerprint reader modules to my Arduino Uno and ESP32 to find which ones enroll fast, match reliably, and have good library support.

How we picked

We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.

Top picks compared

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The Fingerprint Readers I TestedCheck price

Our picks up close

The Fingerprint Readers I Tested

The Fingerprint Readers I Tested

The [Adafruit Optical Fingerprint Sensor](https://www.amazon.com/s?k=Adafruit+Optical+Fingerprint+Sensor&tag=thetestedhub-20) was my top pick because the Adafruit library is rock solid, the documentation is the best in the category, and enrollment was painless.

Check price on Amazon →Read our full review →

Quick answers

Do fingerprint sensors work on 3.3V boards like ESP32?

Most modern modules run on 3.3V to 5V and the data lines are TTL serial so they work fine on ESP32. The R503 and R307 are my go-to picks for ESP32 builds.

How many fingerprints can these store?

Most modules store between 100 and 1000 templates onboard. For home automation projects 100 is plenty, but for office access control look at the R503 or R557 with larger storage.

CW
Casey WalshHome, Kitchen & Pet Products Editor

Casey is the Home, Kitchen and Pet Products Editor at The Tested Hub, covering everything from dog and cat food to vacuums, outdoor power tools, and home organization. With years of real-world product testing experience and a house full of pets, Casey evaluates pet food on nutritional merit against AAFCO guidelines and puts home gear through real-world use in a busy shared household. Expect honest, lived-in reviews built on rigorous testing rather than spec sheets.

10+ years of real-world consumer product testingEvaluates pet food against AAFCO nutritional guidelinesReal-world testing across home, kitchen, and outdoor categoriesMulti-pet household reviewer for pet food and accessories

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