Инфракрасный датчик движения (PIR Motion sensor) HC-SR501 (DSN-FIR800) используется для обнаружения в контролируемой зоне движения объектов, которые излучают инфракрасное излучение (тепло). Принцип работы датчика основан на пироэлектричестве.
Пироэлектричество — это свойство генерировать определенное электрическое поле при облучении материала инфракрасными (тепловыми) лучами. Над чувствительным элементом установлена линза Френеля, которая используется для увеличения радиуса обзора и усиления входящего инфракрасного сигнала.
Модули HC-SR501 представляет из себя модуль состоящий из ИК сенсора 500BP, линзы Френеля, и управляющей модулем микросхемы BISS0001. Режим работы модуля задается перемычкой (режим H или режим L).
Режимы работы
Режим работы модуля задается перемычкой. Есть два режима — режим H и режим L. На фото модуль установлен режим H.
- Режим H — в этом режиме при срабатывании датчика несколько раз подряд на его выходе (на OUT) остается высокий логический уровень. Красная перемычка.
- Режим L — в этом режиме на выходе при каждом срабатывании датчика появляется отдельный импульс. Жёлтая перемычка.
Примечание:
На данном экземпляре нету колодки для перемычки, а есть контакты на плате для запайки перемычки, причём вариант Н уже замкнут печатным проводником.
Для выбора режима L необходимо удалить заводскую перемычку (как указано на картинке).
Основные характеристики HC-SR501
- Цвет: белый зеленый
- Размеры: 3,2 см х 2,4 см х 1,8 см (примерно)
- Инфракрасный датчик контроля плате
- Чувствительности и времени задержки может быть отрегулировано
- Рабочее напряжение: DC 4.5V-20V
- Ток: <60 mA
- Выходное напряжение: высокий / низкий уровень сигнала: 3,3 В Выход TTL
- Дальность обнаружения: 3 — 7М (можно регулировать)
- Дальность обнаружения: <140 °
- Время задержки: 5-200S (может быть скорректирована, по умолчанию 5 с -3%)
- Блокада времени: 2,5 S (по умолчанию)
- Trigger: L: Non-повторяемые триггер H: Повторите Trigger (по умолчанию)
- Рабочая температура: -20 — 80 ° C
- Метод запуска: L неповторимый триггер / H повторяемые триггера
Контакты:
OUT (выходной сигнал) – контакт для обмена данными между датчиком и микроконтроллером;
VCC – напряжение питания (4,5 — 20в);
GND – общий контакт.
Инфракрасный датчик движения HC-SR501 не рекомендуется использовать в местах с резкими перепадами температур (резкий всплеск инфракрасного излучения) от нагрева он будет воспринимать как появление перемещающегося объекта, что может вызвать ложное срабатывание.
Модуль HC-SR501 часто применяется в охранных сигнализациях, а так же в умных домах для контроля освещения при появлении в помещении человека.
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hc-sr 501 datasheet
60 mA output
для повышения помехоустойчивости подключил выход датчика через оптрон 817-й.
Выход датчика на 1-й вывод оптрона (диод), со 2-го на землю через резистор 750 Ом. 4-й вывод на + питания (коллектор фототранзистора), Выход (эмитерный повторитель) 3-й вывод подключен к земле через резистор 1.5 кОм.
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