vb.net barcode scanner tutorial PCB layout twelve in Android

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12.7 PCB layout twelve
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12.8 PCB parts placement
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When making the light-level adjustment, use a low level of light to activate the robot. When the robot is on the floor, if the light level is set too high it will stop every time it passes under a shadow.
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Putting it all together
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Once the circuit is adjusted, you are ready for the final assembly. Glue the AA battery pack to the back of the gearbox, making sure that no glue comes into contact with any of the gears. Glue the electronic circuit board to the front of the gearbox, again making sure that none of the glue touches any of the gears. Connect the power supply. At this point the gearbox will probably start turning. To load the mechanism inside the robot, bring all the parts into a dark room to deactivate the circuit. Load the assembly inside the sphere. Take the robot out into the light. The gearbox should become active. Place the robot on the floor. The robot should travel toward or in the direction of light. If the robot does the opposite, stop the robot, remove the gearbox and electronics, and reverse the wires leading to the motor.
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Locomotion
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I was pleasantly surprised when I began observing this robot. I originally thought it would become trapped easily. Not so. When the robot enters a corner and stops, the gearbox inside begins swinging all the way up and over, radically shifting its weight over top dead center and moving the robot out of the corner.
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Advancing the design
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When I originally designed this robot, I planned to use a steering mechanism to track a light source. However, the small steering mechanism didn t have enough weight to turn the robot in any direction quickly. In the long run, other factors (terrain, obstacles,
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Solar-ball robot
etc.) affect its direction. Hence I removed the steering. But this is still a good research area for advancing the overall design.
Adding higher behavior module
As the robot stands, when a certain level of light is reached it becomes active. We can add a higher behavior mode, feeding, by adding a few more components (two solar cells and steering diodes) and another comparator circuit. The second comparator circuit will deactivate the motor when the light illumination level becomes high enough, allowing the solar cells to charge the AA batteries, which will be changed to nickel-cadmium (NiCd) batteries. Figure 12.9 illustrates the behavior. When the light level is low, the robot is off, or we can say it is in a resting mode. As illumination increases, it reaches a point where the motor turns on and the robot enters its searching mode. When the light level increases significantly beyond this point (searching mode), the second comparator turns off power to the gearbox motor, allowing the two solar cells to charge the AA NiCd batteries, which triggers the feeding mode. If you plan to add this feeding behavior circuit, keep track of the current drain to the comparator circuits. It must not exceed the current supplied by the solar cells or obviously no charging to the NiCd batteries will occur.
Parts list for the solar-ball robot
(1) 51/2" transparent plastic globe (see text earlier in this chapter) (1) Gearbox (see text earlier in this chapter) (1) 6" length of 1/2" solid plastic rod (1) 3" length of 5/8"-OD, 1/2"-ID plastic tubing (1) 1" length of 1/2" half-round plastic rod
12.9 Layering higher behavior twelve
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Electronics
(1) 5V CMOS op-amp ALD 1702 or equivalent (1) 33K-ohm, 1/4-W resistor (1) CdS photoresistor (1) 4.7K-ohm potentiometer (PC mount) (2) 15K-ohm resistors (1) 0.0047- F capacitor (1) TiP 120 NPN Darlington (1) PCB A kit containing all the above components is $65.00. Shipping and handling via UPS Ground Service is $9.50. New York state residents add 8.25% sales tax. Parts are available from: Images SI, Inc. 39 Seneca Loop Staten Island, NY 10314 (718) 698-8305
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