Pulse oximeter and internal combustion engine: what they have in common

1. Step 1. Pulse oximeter — is part of — Smartwatch. A heart-rate and SpO₂ sensor.
2. Step 2. Smartwatch — has part — System on a chip (SoC). Inside is a system on a chip.
3. Step 3. System on a chip (SoC) — has part — Microprocessor. Inside the SoC are processor cores.
4. Step 4. Microprocessor — is part of — Engine control unit. A microprocessor.
5. Step 5. Engine control unit — is part of — Internal combustion engine. An engine control unit.

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