Sextant and joystick: what they have in common

1. Step 1. Sextant — works like — Star tracker. Navigating by the stars — as sailors did.
2. Step 2. Star tracker — has part — Image sensor. A camera.
3. Step 3. Image sensor — has part — Photodiode. A sensor pixel is a photodiode.
4. Step 4. Photodiode — is part of — Perceptron. Photocells read the image.
5. Step 5. Perceptron — has part — Potentiometer. Potentiometers set the weights.
6. Step 6. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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