Perancangan Alat Pendeteksi Banjir Berbasis Mikrokontroler AT 89S51

Abstract

Rangkaian pendeteksi banjir terdiri dari sensor level air, rangkaian mikrokontroller, rangkaian driver relay, rangkaian relay lampu, rangkaian alaram. Sensor air bekeija berdasarkan daya hantar listrik air, dimana jika level air telah mencapai kontak sensor air akan mengalirkan arus dari sumber +5V pada basis transistor sebingga transistor on. Setiap Lampu indikator 220V dikendaikan oleb sebuab relay+ 12V dimana relay ini didrive oleb sebuah Opto-coupler 4N25. The flood detection circuit consists of a water level sensor, circuit microcontroller, relay driver circuit, light relay circuit, alarm circuit. The water sensor works based on the electrical conductivity of water, where if the water level is high reaching the water sensor contacts will flow current from the +5V source on the base transistor so that the transistor is on. Each 220V indicator light is controlled by a + 12V relay where this relay is driven by a 4N25 opto-coupler.