Rangkaian Saklar Lampu Otomatis Menggunakan Sensor Cahaya
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Rangkaian Saklar Lampu Otomatis Menggunakan Sensor Cahaya. Seringkali
kita malas mematikan lampu ketika pagi hari. Berikut solusi untuk
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Skema Rangkaian
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| Rangkaian Saklar Lampu Otomatis Menggunakan Sensor Cahaya |
This is a photocell circuit for detecting the light intensity. At full
light the resistance of the photocell will be few ten ohms and at
darkness it will rise to several hundred ohms. IC1 Op amp uA741 is wired
as a comparator here. At darkness the resistance of photocell increases
and so the voltage at the inverting input of the IC1 will be less than
the reference voltage at the non inverting input. The output of the IC1
goes to positive saturation and it switches ON the transistor to
activate the relay. By this way the lamp
connected through the relay contact glows. The diode D1 works as a freewheeling diode.
A light sensor (photodetector) that varies its resistance between its
two terminals based on the amount of photons (light) it receives. Used
for photographic light meters, automatic on-at-dusk street lights and
other light-sensitive applications, it is also called a "light dependent
resistor" (LDR) and "photoresistor."
The photocell's semiconductor material is typically cadmium sulfide
(CdS), but other elements are also used. Photocells and photodiodes are
used for similar applications; however, the photocell passes current
bi-directionally, whereas the photodiode is unidirectional.
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| Photocell |
Photocells come in a variety of packages such as this assortment from
PerkinElmer. As the photocell receives more photons, the resistance is
lowered between the two terminals.
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