| Summary: | In Indonesia, it still many uses of open-close dam door by manual by operators. Their job is to open the dam door when water leveled up or already in �ready� status. But, the thing is, this kind of is less-efficient and often cause accidents or usually called human-error. It caused the water overflew and then become cause of flood.
This final task aim for build a prototype which function is to control the open-close water-dam door automatically to prevent cause of flood caused by human error. Beside that, this prototype is also providing information about the water-level inside the water-dam in real in standard centimeter on a LCD 16 x 2. This prototype of automatic water-dam door which basis is arduino, is special instrument that use as simulation of the automatic water-dam door. This instrument works detecting height of water-level using ultrasonic censor SRF04. There are also LED indicators that will turn-on on various level of water detected by censor. If SRF04 detecting �alert� status, then the buzzer will on and the DC motor will work to make the water-dam door up. Also when SRF04 detecting water level into normal, the DC motor will work to down the water-dam door.
Based on the experiments, it can be concluded that this prototype instrument automatic water-dam arduino based can work well according to planned work-principal. There is an average percentage error of water level calculation of 1,16 %
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