How does a smartphone know if it’s upside down? [accelerometer]

The Engineer Guy has very informative videos, like the one above. Accelerometers are used to show direction and using them the smartphone knows where is up or down.

When they first started to work on accelerometers, the engineers used a recipient in which they would insert a spring and a weight on one of its ends. Use three such devices oriented in the three directions and you have yourself an accelerometer. Interesting how they could fit such a device in a smartphone.

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