A look at all the circuitry at the moment.
The finger clip has been improved, using the clothespeg to keep it secured and a tube of black tape to filter out the natural light.
Inside the finger clip, showing the IR LED and phototransistor.
The clip also uses a small screw with a nut to adjust the pressure needed for each person, so it isn't to tight.
The LCD screen works to display the time
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