Object Motion Direction Identification Circuit

Published:2011/5/9 2:42:00 Author:Sharon | Keyword: Object Motion, Direction Identification | From:SeekIC

Place two objects of similar resistance and performance on the same side of the object motion path, with an appropriate distance from each other. The relative position of the other side is installed two light sources respectively, so that objects between the light source and photosensitive resistancemove move in direct line. The circuit in the figure can judge the direction of the moving objects. The circuit is formed by two parts: bridge and the polarity discrimination. Rs1, Rs2, R1, R2 and Rw form the bridge, E0 provides power supply and A, B-side output. Before measuring, make Rs1 and Rs2 in the same shade or light, adjust Rw, so that the bridge is balanced. UAB = 0V. When measuring, when the object move from the bottom to up, Rs2 is the first to be shaded, resistance increases, Rs1 is in light, resistance is less, and bridge is unbalanced. UA> UB, UAB> 0V, the VT1, VT2 is ended, VT3, VT4 get through, relay J1maintains the off state, and J2 pulls. When the object continues to move upward to the Rl position, the opposite, J1 pulls, J2 opens. If the object conducts the top-down movement, contrary to the above, J1 is prior J2 to pull. Thus, J1 and J2's pull sequences can determine direction of objects movement, and provide the corresponding switching control signal output.



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