The demand for electricity is increasing all over the world. In Bangladesh, there are many rural areas where the grid connection has not reached yet. In this paper, a performance evaluation was done with a solar-wind hybrid renewable energy system with diesel backup for a school located in a remote area, Baje Fulchari village in Gaibandha district, Bangladesh. For the proposed site, the load demand was considered 10.468 kWh/day for a normal working day (taken from a field survey) having peak demand of 3.3 kW. HOMER software was used for the simulation. The solar radiation and wind speed data were collected from NASA Surface meteorology and Solar Energy database. The NPC for the most economical system configuration is found USD 6,191 with a COE of 0.125 $/ kWh. Compared to the conventional power plants the proposed system can reduce the COE and GHG emission of about 29.85% and 69% respectively. The system evaluated in this work might be implemented in a school or any other location of similar load profile anywhere in the world having the same geographical and meteorological conditions.

This paper presents an automatic side stand retractor to ensure the safety of the motorcycle. Many motorcycle accidents take place due to the wrong position of side stand. The automatic side stands retractor prevents the starting of the motorcycle for ensuring safety. The proposed system uses an embedded controller, reed switch sensor, permanent magnet, buzzer and relay. The embedded controller detects the position of side stand using a reed sensor and a permanent magnet attached to it. Then embedded controller breaks the ignition circuit of the motorcycle using a relay in case of the wrong position of the side stand. A buzzer makes a sound to notify the rider to retract the side stand. This system is tested in motorcycle and the obtained result shows the effectiveness of the system for the safety of the motorcycle. The device not only ensure the safety of the driver but also ensure the mobility of the whole system of the motorcycle.