Abstract
A stair-climbing robot is equipped with a grasping arm for capturing objects to provide service for the elders. A board based on a digital signal processor (DSP) plays the role of control center to manage all actions of two brushless DC motors for locomotion, two worm gears for torque magnification, and two DC motors for arms’ pitching in the main body. The robot is steered by fuzzy logic control (FLC) which integrates the outputs of DC bus current sensor and an inclinometer. There is a CMOS camera for vision used in the robot, and the grasping arm is controlled via the video camera for capturing objects. Simple algorithms of image processing are implemented in the field programmable gate array (FPGA) board that generates the <svg style="vertical-align:-0.0pt;width:13.5875px;" id="M1" height="11.175" version="1.1" viewBox="0 0 13.5875 11.175" width="13.5875" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(.017,-0,0,-.017,.062,11.113)"><path id="x1D44B" d="M775 650l-6 -28q-60 -6 -81.5 -16t-61.5 -54l-175 -191l125 -243q30 -58 48.5 -71t82.5 -19l-5 -28h-275l7 28l35 4q31 4 37 12t-6 34l-108 216q-140 -165 -177 -219q-16 -22 -10.5 -30.5t41.5 -13.5l22 -3l-7 -28h-244l8 28q52 4 75 15.5t67 52.5q48 46 206 231
l-110 215q-26 51 -44 63t-72 17l6 28h250l-6 -28l-27 -4q-30 -5 -35 -10t3 -27q17 -43 95 -190q70 78 154 185q15 21 10 29.5t-33 12.5l-30 4l5 28h236z" /></g> </svg>-axis and <svg style="vertical-align:-0.0pt;width:11.6625px;" id="M2" height="11.175" version="1.1" viewBox="0 0 11.6625 11.175" width="11.6625" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(.017,-0,0,-.017,.062,11.113)"><path id="x1D44C" d="M667 650l-9 -28q-53 -5 -76 -17t-64 -59q-51 -61 -175 -225q-21 -29 -27 -55l-27 -136q-13 -65 -0.5 -80t83.5 -22l-7 -28h-280l8 28q64 4 81 19t30 83l25 128q6 35 -7 65l-98 231q-17 41 -32.5 52t-68.5 16l8 28h252l-6 -28l-40 -4q-27 -3 -33 -12.5t2 -31.5
q8 -26 43 -107.5t61 -134.5q114 145 174 240q14 24 8 33t-37 13l-34 4l8 28h238z" /></g> </svg>-axis commands of the grasping arm to capture/load objects. Three walking experiments of the stair-climbing robot to move up and down stairs are shown in the taped pictures from videos. The object tracking and capturing by the grasping arm and camera verifies the proposed design.
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