Hello everyone, I’m working on a fingerprint-based attendance system using an Arduino UNO and the R307 fingerprint sensor. I have connected all the wires correctly, written the code, and uploaded it without errors. However, the fingerprint sensor is not responding at all — no LED, no serial output,…

R307 Fingerprint Sensor Not Working with Arduino UNO – Need Help Troubleshooting

xfpd July 20, 2025, 8:39pm 7

Try 9600. If that works, increase baud.

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