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Last weekend one of my friend came to me and told me about an HOVERCRAFT event, and I thought I will give it a try as I had never in my life built a RC Hovercraft. So we thought we will learn something while building and we started with just a top-view diagram my junior made it on a drawing sheet. We got two extremely power full brush less DC motor. We did not buy the motor for the hovercraft. we bought two motors to build a twin engine aircraft and thought we can use it for this purpose also. The motors were too power full, hence we had to maintain the power to 50% and max 60%. We encountered several problems like the air cussion was not proper. we had to come up with the perfect design by trial and error. first we used flex banners for air cussion. unfortunately the flex was a bit heavy for the aircraft. later we faced another problem once the hovercraft started to hover, it started to rotate because of the rotational force. then the new problem was the rudder we made was small. we

A grid solving robot is an autonomous robot which is nothing but more brains to a line follower. the grid solver can be programmed to go to specific coordinates like in the videos below. Both the videos have different grids and different coordinates. The first video, has one inch black tape extension at the outer edges. where as in the second video, there are no extensions as in the first video. This makes a lot of difference. since I had only two sensors. If  you had more sensors, say 8-10 then it is easier for you to program it to get to the edges or corners. both the videos were taken at different institutions. I secured first place in both with this robot. and there is another event tomorrow. Anyway back to the topic, if you are planning to build one try to add more sensors. more the merrier. I am not going in detail about the construction of the robot. if you are interested to build one like mine, leave a comment and i will post the full procedure. I used an arduin

                     It is an intelligent robot which can follow a black line on white background. It is a simple yet interesting project. The robot has two Sensor which senses the black line and follows the black line. with Just few components, this marvellous line following robot will be ready to follow. The one I have built is based on arduino. you can build with just any microcontroller. I salvaged the parts from old robot and built this one. Check my Grid solver robot  that is based on the line follower. same hardware, but the program is changed. I used a sensor which gives High or low depending whether its on black or white path. it gives HIGH '1' when on white line or place. and gives LOW '0' when on black path. I uses 2x4V battery, that makes it 8 V. I connected only 4 V to the motor driver for few reasons.namely, 1. The motor is 6v 2. It is a 300 rpm motor and supplying 8 V will increase the rpm 3. Increase In rpm would result in the robot to overshoot