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TitleBab 1-5 Indra
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Penggunaan remote control dalam kehidupan sehari-hari sudah sering kita

jumpai seperti pada TV, DVD, AC, mobil dan lain sebagainya. Dengan

ditemukannya teknologi remote control, maka suatu perangkat dapat dikendalikan

dari jarak jauh tanpa harus bersusah payah untuk mengendalikannya dari jarak

dekat. Secara garis besar ada dua macam tipe remote control. Tipe RF

(menggunakan frekuensi radio). Tipe infrared (menggunakan LED inframerah).

Walaupun setiap tipe berbeda tetapi tetap terdiri dari perangkat pengirim

(pemancar) dan penerima. Pada pembahasan kali ini dikhususkan pada remote

control jenis gelombang RF (Radio Frequency). Cara kerja gelombang RF adalah

membawa sinyal-sinyal berupa pulsa yang nantinya akan dipisahkan kembali oleh

rangkaian penerima agar dapat dijadikan nilai masukan pada mikrokontroler. Aru,

Okereke Eze , Ihekweaba Gozie, dan Opara F.K. (2013:57) menyatakan :

“A radio-frequency remote control, or RF remote, uses radio

waves to transmit a signal to an electronic device. RF remotes

are very common; they're used in devices such as garage door

openers, remote control toys and remote car-entry key, remote

wall sockets, etc. An RF remote encodes commands in binary

form. The commands are sent via the radio waves to devices on

the receiving end -- say, a DVD player -- that decode the

commands and send them to the right place (volume up/down,

etc.). A useful feature of RF remotes that sets them apart from

infrared (IR) remotes is they can transmit signals up to 100

feet (30.5 meters) and can travel through walls and furniture.

IR remotes, however, can only go 30 feet (9 meters) and need

line of sight. Instead of sending out light signals, an RF

remote transmits radio waves that correspond to the binary

command for the button you're pushing. A radio receiver on

the controlled device receives the signal and decodes it. The

problem with RF remotes is the sheer number of radio signals

flying through the air at any given time. Cell phones, walkie-

talkies, WiFi setups and cordless phones are all transmitting

radio signals at varying frequencies. RF remotes address the

interference issue by transmitting at specific radio frequencies

and by embedding digital address codes in the radio signal.

This lets the radio receiver on the intended device know when

to respond to the signal and when to ignore it.” (Aru, 2013)

Dengan kata lain, RF remote control menggunakan gelombang radio untuk

menyampaikan sinyal ke alat elektronik. Pengunaan gelombang radio

membedakan remote ini dari remote inframerah, RF remote mampu

menyampaikan sinyal sampai jarak maksimal 100 kaki atau 30.5 meter dan bisa

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