Hello:wink: just try to hold you finger 
Here is a vidéo https://youtu.be/7WnKXj6tPgg?si=uk7szGCMmNG3V0vY
and this one to recalibrate the sensors
https://youtu.be/NAFdNrXpPRg?si=sCJMMMxJs0FQ9xe0
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