jobsheet dioda semikonduktor sensor cahaya

SMK Negeri 1 Magelang/Teknik Elektronika /Teknik Audio Video/XEC/2015

JOBSHEET SENSOR CAHAYA (LDR)

I. TUJUAN PRAKTIKUMSiswa dapat memahami karakteristik sensor cahaya LDR (Light Dependent Resistor)

II. TEORI DASARLDR (Light Dependent Resistor) merupakan suatu resistor yang memiliki fungsi sebagai sensor cahaya dengan menerapkan cahaya sebagai nilai penentu hambatannya. LDR ini dapat bekerja jika nilai resistansinya (hambatan) mengalami perubahan dari cahaya yang diterima. Dengan perbandingan jika cahaya yang diterima LDR sedikit maka nilai resistansinya akan semakin besar, sedangkan jika cahaya yang diterima LDR semakin banyak maka nilai resistansi semakin sedikit. LDR biasanya digunakan untuk sensor lampu di jalan, lampu akan aktif pada saat malam hari.Simbol Dan Fisik Sensor Cahaya LDR (Light Dependent Resistor).

III.ALAT DAN BAHAN

1. LDR 5mm2. LED3. Resistor 150 Ω4. Transistor BJT NPN (sebagai

saklar otomatis)

5. Baterai 3-5 volt6. Multimeter7. Project board8. Jumper

IV. LANGKAH PERCOBAAN1. Buat rangkaian sensor cahaya pada project board.

2. Catat tegangan pada voltmeter untuk berbagai intensitas cahaya.

Modul Praktikum Rangkaian Sensor Cahaya LDR


3. Ulangi percobaan dengan mengganti V Sumbernya.



V. TABEL PENGAMATAN

V Sumber (Volt)

V rangkaian

(Volt)

I rangkaian(Ampere)

R LDR (Ohm)Kondisi

LEDTerangDibawah

mejaDitutup tangan

VI. Tugas

1. Analisa bagaimana pengaruh intensitas cahaya terhadap nilai tahanan LDR.

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....................................................................................................................................2. Analisa bagaimana pengaruh nilai tahanan LDR terhadap kondisi LED.

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....................................................................................................................................3. Analisa bagaimana hubungan antara V Sumber, nilai tahanan LDR, dan kondisi LED?

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VII.Kesimpulan..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................


jobsheet dioda semikonduktor sensor cahaya

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