Este circuito de 2003 utiliza dos tipos de sensores: por reed-switch y por infrarrojo. Si el sensor magnético (reed) se abre, no habrá activación inmediata de la sirena, pero sólo después de algún tiempo. Este tiempo es determinado por la segunda mitad del CI 556 (doble 555 - monoestable) a través del resistor y capacitor conectados a los pinos 12 y 13. Se pueden hacer cambios en el tiempo modificando los valores de estos componentes. Después de la ruptura del sensor, el 556 (primera mitad - astable) enviará un pulso positivo a la cuenta. La primera y la segunda salidas cuentan sólo el tiempo mientras que la tercera salida es que hará el accionamiento de la sirena. La cuarta salida (pin 7) del 4017 envía un nivel alto al perno 15 restableciendo la cuenta. Cuando el sensor magnético está cerrado, restablece el 4017 bloqueando la cuenta. El sensor infrarrojo, cuando detecta el objeto, dispara un bocadillo y este sensor está intercalado con otro sensor, el sensor nocturno. Al oscurecerse, el sensor IR accionará tanto el bocadillo y la sirena. El LDR debe colocarse para recibir sólo la luz ambiental. El trimpot de 1 M ohms determina la sensibilidad del sensor nocturno. La alimentación puede ser hecha por fuente o batería de 12 V. L1 parpadeará indicando que el astillado está oscilando. L2 quedará encendida cuando el sensor magnético esté cerrado, e indicará que el contador está restablecido. L3 encendido indica que la cuenta comenzó. L4 encendido indica que habrá el disparo de la sirena. Los cambios en los valores de los resistores y el capacitor electrolítico conectados en los pinos 1, 2 y 6 del 556 cambiarán la frecuencia del astable.

 


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18.837MBMemory Usage56.28msRequest Duration
Joomla! Version5.2.3
PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
Database
Server
mysql
Version
10.5.22-MariaDB
Collation
latin1_swedish_ci
Conn Collation
utf8mb4_general_ci
$_GET
[]
$_POST
[]
$_SESSION
array:1 [ "joomla" => "***redacted***" ]
$_COOKIE
[]
$_SERVER
array:51 [ "USER" => "apache" "HOME" => "/usr/share/httpd" "SCRIPT_NAME" => "/index.php" "RE...
session
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    35.16ms
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