A simple frost sensor. Scheme, description

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A simple frost sensor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Home, household, hobby

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The proposed temperature sensor can be useful to owners of garden houses.

Simple frost sensor

Two contacts placed inside a flexible plastic container will definitely close if the water in the metal jacket freezes. The sensor will thus give a signal that the temperature has dropped below zero, for example, in a cellar where vegetables are stored.

Author: V.Makarov

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American scientists have found that nickel, which is contained in personal electronic mobile devices such as laptops, tablets and mobile phones, can be the cause of an allergic rash on the human body, especially a child, according to the medical weekly journal Pediatrics.

The report of scientists cites the case of an 11-year-old boy who developed inexplicable, and at first glance, causeless, itching and rash. It was later revealed it was an allergic reaction to the nickel contained in his iPad. As explained by the child's doctor, a dermatologist from the hospital Rady Childrens Hospital, Sharon Jacob (Sharon Jacob), such an allergic reaction is not life-threatening patients, but can cause pain and discomfort.

Nickel is one of the most allergenic metals, while it is almost indispensable in the manufacture of personal gadgets. An allergic reaction can be avoided by storing them in special cases. However, nickel is found not only in electronic devices and technology, but can also be found in jewelry, glasses, lighters.

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