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• Просмотр темы - Тревожная радиокнопка!!!
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Тревожная радиокнопка!!!

СообщениеДобавлено: Пн авг 27, 2007 3:27 pm
Ceroz
Добрый день!

Мне необходимо подавать на компьютер сигнал тревоги по радио-каналу. Физически это выглядит как замыкание 2-ого и 3-его пина на com-порте, т.е. при нажатии кнопки на радио брелке (передающее устройство (как ДУ автосигнализации)) приёмник должен замкнуть соответствующие пины com-порта. Основная проблема состоит в том, что требуется запитывать приёмник от com-порта, который даёт ток порядка ед. мкA.

Подскажите как это можно реализовать? Может у кого-то есть подобные решения?

Re: Тревожная радиокнопка!!!

СообщениеДобавлено: Чт июл 31, 2008 11:13 am
Ahsim
А поподробней не скажешь какое напряжение и сила тока в этом com порте

Re: Тревожная радиокнопка!!!

СообщениеДобавлено: Чт июл 31, 2008 10:58 pm
-sasha-
хм.обязательно ли запитывать с com порта ?? или можно с usb, с мулекса блока питания???
но выход есть.взять специальную микросхемку преобразователь dc/dc подать на неё 5 в-8мА и получить на выходе 5В 1А. микросхем множество так что подбирать нужно конкретно в зависимости от нужд...


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