Intelligent Path Finding Robot

Abstract:

The Path Finding Robot is an open loop control system. The reflecting type sensors fixed in the X and Y-axis, detects obstructions, in the path of the moving robot. When an obstruction is detected, the direction control steers the robot, in a different direction. The access control stops and start the movements. The speed of movements is also controlled, depending on the requirements.

The infrared rays reflected back by an object, in the path, is sensed by sensitive receptors. The amplified signals are then read by a powerful 8-bit microcontroller. An algorithm computes the safe direction, and steers the device, with stepper motor. Steppers are employed, for motion and direction drives. Programmed movements, as per the feedback is achieved. When an obstruction is detected in front, the robot looks left and then right, for an entry. If all the directions are blocked, it reverses with a beep, to indicate a dead block. The idea can be used to detect obstruction in underground tunnels, and determining the distance of the block from the entrance. Programmable timers, derive the timing signal for the steppers. The basic concept can be expanded for use in more complex robotic applications.

The human interface to the robot is through a wireless remote. Three push buttons are given on the remote, for forward, left and right movements. The wireless transmitter transmits ASK modulated signals over an fm carrier. The receiver section decodes this signal and gives commands to the microcontroller. An audiovisual indication of the movements and obstructions are provided, using piezo electric beeper and LEDs. Comprehensive block diagram of the system is enclosed

 

 Complete System:

 Bottom view:

 Front view:

 Wheel Alignment: