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Many thing in our daily need that can be easily by implement a simple applied technology. So our life become easy and comfort. We can make anything work automatic, or work without our intervention so if we forget to run it, or to turn off it, they will be done by their shelf.

 

By a simple applied technology, such as electronics, we can solve many simple problem as mentioned above. With the small dimension of electronic component and small power too, we can realize our need, such as automatic lamp, remote controller, water tank level controller.

 

Beside all that mention above, we can make many device that valuable to our need, such as decorative lamp, amplifier, detector etc. The simple applied electronic circuits are divided in to two groups, analog and digital circuitry. 

 

Analog electronic circuits are those in which signals may vary continuously with time to correspond to the information being represented. Electronic equipment like voltage amplifiers, power amplifiers, tuning circuits, radios, and televisions are largely analog (with the exception of their control sections, which may be digital, especially in modern units).

 

In digital electronic circuits, electric signals take on discrete values, which are not dependent upon time, to represent logical and numeric values. These values represent the information that is being processed. The transistor is one of the primary components used in discrete circuits, and combinations of these can be used to create logic gates. These logic gates may then be used in combination to create a desired output from an input. In this page you can find one of the circuit.

 

 

Line Detector  Using Opto coupler

 

 

 

 

 

Opto coupler (Gambar 1) dapat digunakan sebagai sensor garis hitam, yaitu dengan cara memecah opto coupler tersebut menjadi dua bagian yaitu pemancar (Led Inframerah) dan penerima (photo diode) seperti Gambar 2 .

 

 

 

 

Gambar 1. Opto Coupler.

 

 

 

 

 

Gambar 2. Komponen dalam Opto Coupler.

 

 

Kedua komponen tersebut dirangkai seperti pada Gambar 3, dengan tambahan sedikit komponen pendukung.

 

 

 

Gambar 3. Rangkaian Detector Garis.

 

Prinsip kerja dari rangkaian ini adalah ketika cahaya infra merah dipancarkan oleh IRLED, maka akan dipantulkan oleh media menuju ke photo diode, jika warna media adalah terang (putih), maka pantulan infra merahnya akan kuat sehingga transistor C9013 akan ON, sehingga Vout adalah mendekati nol, ketika warna media adalah gelap maka pantulan infra merahnya adalah lemah sehingga Vout akan tinggi. Seperti diperlihatkan dalam Gambar 4, 5 dan 6.

 

 

 

Gambar 3. Rangkaian Detector Garis tanpa adanya pantulan.

 

 

 

Gambar 3. Rangkaian Detector Garis dengan media pantul terang.

 

 

 

Gambar 3. Rangkaian Detector Garis dengan media pantul gelap.

 

 

 

 

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