By looking at the potential of this rainwater, Indonesia is part of an area with high rainfall intensity. In several regions in Indonesia, a natural phenomenon often appears, namely when the rainy season arrives, a large amount of water occurs, based on annual data from the BMKG (Meteorology, Climatology and Geophysics Agency). In this work, the potential of power generated from rainfall is overlook based on the precipitation of rainfall, total days of rainfall and typical house design. It is found that the potential of electric power that can be generated from rainfall at least 1000 watts per month of January, February, March, April, November, and December.
Pasirmulya Village Bandung has a wastewater treatment plant that can be developed to serve as an alternative fuel for the biogas digester. Biogas has a great attracted by researchers in developing a renewable energy source to be used for residential. This process is designed to produce alternative energy to reduce the impact of fossil fuel uses. The design of biogas system is to utilize the use of wastewater treatment in current condition. Critical path methodis used to identify the critical activities in this project. The Biogas works using 16 components with critical paths or activities that must be done first. The project shows the critical path method preparation for bill of material – material purchases – Cutting 0.75-inch PVC pipe – piece of pipe assembly – plant the pipe at the land – pipe assembly with elbow PVC – cover and pipe assembly – stove assembly – biogas stove testing - quality check – project reporting and documentation with 8 hours total time activity in one day. This community service project was implemented and found the potential of using biogas system for residential purposes.
Garbage is basically a material that is wasted or disposed of from a source resulting from human activities or natural processes that have no economic value, and can even have a negative value if it is not handled properly. Of the various kinds of waste that exist, one type of waste that can still be reused is plastic bottle waste. This study discusses the design and manufacture of a portable plastic bottle waste bank that provides sales value automatically through measuring the weight of plastic bottles using Arduino software. This plastic bottle waste bank tool is designed with the feature of automatic sales value acquisition through the acquisition of scale calibration data and determination of bottle categories measured using an IR sensor. The plastic bottle waste bank system is set using the Arduino Uno program to obtain the calibration factor from the load cell sensor. The test results show that the calibration factor with a value of 701 shows the smallest error percentage value and the average weight of the measuring stone is close to the actual value with the average data collection variable i in one experiment of 5. Testing on this waste bank tool is quite good because the tool able to provide categories and selling prices of plastic bottles based on a given programming function. However, this tool still lacks in the accuracy of calibration on the scales.
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