\/span><\/div>
The R307 fingerprint sensor has four important pins<\/strong>, which need to be connected to the Arduino Uno<\/strong> as follows:<\/span><\/p> <\/span> After making the connections, follow these steps to test your R307 Fingerprint Sensor<\/strong> with Arduino Uno<\/strong> using the Adafruit Fingerprint Sensor Library<\/strong>.<\/span><\/p> <\/span> 👉 Open Arduino IDE<\/strong> 👉 Go to File<\/strong> > Examples<\/strong> ✅ Connect your Arduino Uno<\/strong> to your PC via USB 🔹 Go to Tools<\/strong> > Serial Monitor<\/strong> Expected Output in Serial Monitor<\/span><\/p>R307 Pin<\/span><\/strong><\/th> Wire Color<\/span><\/strong><\/th> Arduino Pin<\/span><\/strong><\/th> Function<\/span><\/strong><\/th><\/tr><\/thead> Pin 1<\/span><\/strong><\/td> 🔴 Red<\/strong><\/span><\/td> 5V<\/span><\/td> Power Supply (+5V)<\/span><\/td><\/tr> Pin 2<\/span><\/strong><\/td> ⚫ Black<\/strong><\/span><\/td> GND<\/span><\/td> Ground (-)<\/span><\/td><\/tr> Pin 3<\/span><\/strong><\/td> 🟡 Yellow<\/strong><\/span><\/td> D2<\/span><\/td> Serial TX (Data Transmission)<\/span><\/td><\/tr> Pin 4<\/span><\/strong><\/td> 🟢 Green<\/strong><\/span><\/td> D3<\/span><\/td> Serial RX (Data Reception)<\/span><\/td><\/tr><\/tbody><\/table>
<\/div>Testing & Output<\/span><\/strong><\/h3> <\/span>
1. Install the Adafruit Fingerprint Sensor Library<\/span><\/strong><\/h4> <\/span>
👉 Go to Sketch<\/strong> > Include Library<\/strong> > Manage Libraries<\/strong>
👉 Search for "Adafruit Fingerprint Sensor Library"<\/strong> and install it.<\/span><\/p><\/p> <\/span>
2. Load the Fingerprint Enrollment Code<\/span><\/strong><\/h4> <\/span>
👉 Scroll down and find Adafruit Fingerprint Sensor Library<\/strong>
👉 Select "enroll"<\/strong><\/span><\/p> <\/span>3. Upload the Code to Arduino<\/span><\/strong><\/h4> <\/span>
✅ Select the correct Board (Arduino Uno)<\/strong> and Port<\/strong> in Arduino IDE
✅ Click the Upload<\/strong> button<\/span><\/p> <\/span>4. Open the Serial Monitor<\/span><\/strong><\/h4> <\/span>
🔹 Set the Baud Rate to 9600<\/strong>
🔹 Follow the on-screen instructions to enroll a fingerprint
🔹 Once successfully enrolled, try scanning the same finger to verify<\/span><\/p><\/span><\/div>
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