Innovator's Hangout

Its a robot powered by arduino. It dose not use a Acclerometer or a Gyro.. All it has is a LDR and an LED fixed perpendicular to the ground. When the robot is powered up it has to be held perpendicular manually and a calibrate switch has to be pressed. This takes the value from the LDR and stores it as reference for further calculations, later on the output from the LDR tells the arduino whether its falling towards the front or back.. This value when taken seriously also tells whats angle the bot is making and this is related to the PWM of the wheels which rotate in the counter direction to compensate the fall.

This one is built using analog comparaters which compares the values of two adjacent LDRs and gives the output to a motor driver.. Its a fairly simple circuit with pretty good application.. The stability not very good as the source of the light is too close.. Will be adding a video of it performing outdoors when i find some time..

This was my academic mini project

With help from a friend i could improve the displays stability.. Now the RPM of the motor is pretty good.. Added a mechanical gravity switch so that the display turns on after it reaches a particular RPM. Added an IR switch too..

Finally i built up confidence to use a controller. This is my first project using a micro controller.. I had problems with the stability. So the RPM of the display was pretty less

As the below two posts.. This is again a simple thing using two op amps and motor drivers.. Do note that its the same circuit doing three different things..