CCD sensor and fitness tracker: what they have in common

1. Step 1. CCD sensor — uses — Photovoltaic effect. Light generates charge in the cells.
2. Step 2. Photovoltaic effect — is used in — Photodiode. Light generates a current in the junction.
3. Step 3. Photodiode — is part of — Pulse oximeter. A photodiode.
4. Step 4. Pulse oximeter — is part of — Fitness tracker. An optical heart-rate sensor.

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