SeeedStudio Grove Fingerprint Sensor Manual page 11

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If there's a problem such as a bad print or image, you'll have to do it again.
Once you have the finger enrolled, it's a good idea to do a quick test to make sure it can be found
in the database.
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Open the demo code: fingerprint and upload it.
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When prompted, press a different/same finger to the sensor. If it is the same finger, you should
get a match with the ID # as show below.
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