i need toknow the principleof how an automatic cloak room light works

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thanks for the project principle provided

A cloakroom, or sometimes coatroom, is a room for people to hang their cloaks or other outerwear when they enter a building. Cloakrooms are typically found inside large buildings, such as gymnasiums, schools, churches or meeting halls.

In the UK, a cloakroom may also refer to a lavatory. The word is often thought to be derived from the French cloaque (sewer);[citation needed] however, it comes from the French cloque meaning "traveling cloak