Fingerprint Sensor AS608 - A Beginner's Guide
One touch can replace keys. This project uses an optical fingerprint sensor to enroll users and then grant access with a quick scan.
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Battery Fuel Gauge — I2C 3.7V Li (DFRobot)
The DFRobot Battery Fuel Gauge (I2C) provides precise, real-time battery state-of-charge readings over I2C. Unlike simple voltage-based indicators, a fuel gauge tracks coulombs in and out for accurate percentage readings — even under varying load conditions. Essential for projects that need to know exactly when to enter low-power mode.
Technical specifications
| Interface | I2C |
|---|---|
| Battery type | 3.7V Li-Ion / LiPo (single cell) |
| Measurement | State of charge (%), voltage, current |
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Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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