Bluetooth transmitter and optical telegraph: what they have in common

1. Step 1. Bluetooth transmitter — is part of — Continuous glucose monitoring. It sends data over Bluetooth.
2. Step 2. Continuous glucose monitoring — is used in — Insulin pump. A closed-loop system.
3. Step 3. Insulin pump — has part — Servomotor. A stepper motor moves the plunger.
4. Step 4. Servomotor — uses — Electromagnetism. A servo is an electric motor with feedback.
5. Step 5. Electromagnetism — is used in — Electrical telegraph. A telegraph receiver is an electromagnet that attracts an armature.
6. Step 6. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

Open Evothings