Pengukuran ketinggian air jarak jauh berbasis dtmf-fm
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Setiap hari manusia selalu melakukan perubahan-perubahan untuk membantu .dalam meringankan tugas-tugas mereka, salah satunya dengan merancang alat penguk\'UI ketinggian air jarak jauh. Alat ini akan sangat berguna untuk menggantikan tugas manusia dalam mcma...\'1mu kctinggian air pada suatu tcmpat, karcna manusia mcmiliki bcrbagai macam kekwangan seperti lengah dalam memantau ketinggian air, kurangnya keakurasian pembacaan ketinggian air, dan lain sebagainya.Alat pengukur ketinggian air ini berbasiskan DTivfF-FM. Alat ini menggunakan ICDTMF MT8880C sebagai bagian encoder DTMF dan IC CM8870 digunakan untuk bagian decoder DTivfF. Untuk bagian transmisinya digunakan gelombang radio FM yang memiliki keandalan lebih baik dalaru ruengatasi·rnasalah ff
E Everyday humans always do changes to help them do their chores, one of the changes they did was designing a telemetric water level measurement. Tilis device will be very useful to replace human\'s job ini measuring water level in any place,This water level measurement is based on DTiv1F-FM theory . This device is using a DTivfF :MT8880C IC as a part of the encoder for the DTh1F and a CM8870 IC as the decoder for the DTiv1F. An FM radio waves is used for transmitting the signal because it has a better noise re.duction . Signal input will be transform to 4-bit binary code that appropriate with the input for the encoder. In the encoder, two frequency were combined to produce a tone. Then those tones will be transmit with an FM transmitter. The frequency of this FM transmitter is 96 1.1Hz. After transmitted, those tones will be receive by an FM receiver and will be transform to 4-bit binary code in the DTMF encoder. And those binary code will be presented on 7-se_gment.From the result of the examination , this DTMF-FM could transmit each dataand can be concluded that this system is a one way communication system. Whentested, this equipment could still have a good performance in 20 m away from the transmitter .