I really like the fuel-efficient cars, as it saves fuel our cars is one of the real action to conserve oil, because oil is a limited energy resources contained in the earth. To create it requires a very long time. takes millions of years. If residents use their cars to save the earth, of course, this means millions of liters of oil can be saved in one day usage. Because every day millions of litter from petroleum use by residents of this earth, from all continents. Crude oil continues to be taken out of the earth, if crude oil intake is not balanced with earth's ability to provide oil, maybe we'll come to a point, where the oil will run out. I can not imagine if we have at the moment. so let us save energy.
Robot line follower is a robot that is designed to be able to walk following the color of the line. Of course this requires basic knowledge of programming. In a line follower robot, we need a color sensor that will be used to detect line colors. Usually to distinguish between black and white. This color sensor, we can use infra red sensors, or can also use the LDR. Once we have a color sensor to detect the line, then we need the brain to make the robot can walk along the line. We can make it with an analog circuit, or with an IC that we will later fill with the program. To charge IC from line follower control, we can use arduino or by using Asembler programming. To learn this program, we must know the basics of logic. If we have the desire and sincerity in learning, to make a line follower is not a difficult thing. To make it easier we have a description of line follower, I took this from youtube video about lne follower. May be useful. link video : https://www.youtub