vb.net barcode scanner tutorial Robotic arm kit fifteen in Android

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15.2 Robotic arm kit fifteen
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15.3 Preassembled gearbox
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15.4 Test circuit schematic
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one transistor (per motor) should be turned on at a time. If two transistors to the same motor are accidentally turned on at the same time, it will be the equivalent of creating a short circuit. Each DC motor in the robotic arm is controlled by two transistors on the interface in a similar manner.
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PC interface construction
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The PC interface schematic is shown in Fig. 15.5. If you purchase the PC interface kit, the printed circuit board (PCB) parts placement is shown in Fig. 15.6. Begin construction by first identifying the component mounting side of the PCB. The component side has the white line drawings of the resistors, transistors, diodes, integrated circuits (IC), and DB25 connector. All components are mounted on the component side. In general, after soldering a component to the board, clip away any excess wire from the underside of the PCB. It s a good idea to follow the sequence for mounting the components. Begin by mounting the
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15.5 PC interface schematic fifteen
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15.6 Parts placement diagram for PC interface
100K-ohm resistors (color bands brown, black, yellow, gold, or silver) labeled R1 through R10. Next mount the fives diodes D1 to D5, making sure the black band on the diode faces toward the DB25 connector, as shown on the white line component drawing. Next mount 15K-ohm resistors (color bands brown, green, orange, gold, or silver) R11 and R13. Mount the red light-emitting diode (LED) in the R12 position on the board. The positive lead of the LED is mounted in the label R12 hole. Next mount the 14- and 20-pin sockets in the U1 and U2 positions. Mount and solder the DB25 right angle connector. Do not force the DB25 pins through the board; it is a precision fit. If necessary, gently rock the connector in, making sure not to bend any pins. Mount the slide switch and the 7805 voltage regulator. Cut and solder four wires above the switch. Take care to keep the wire orientation as shown. Mount and solder the TIP 120 and TIP 125 transistors. Finish the project by mounting the eightposition header and 3" connection cable. The header is mounted so the longer leads face upward. Insert the two ICs, the 74LS373 and 74LS164, into their respective IC sockets. Be sure to orient the chip indentation on the top side of the chip with the indentation on the white line drawing. You may notice that there are places for additional components. This is for an additional AC adapter. Figure 15.7 shows the top side of the finished interface.
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15.7 Assembled PC interface (top)
How the interface works
The robotic arm contains five DC motors. We need 10 input/output (I/O) lines to control each motor and direction. The parallel (printer) port on the IBM PC and compatibles has only eight I/O lines. To increase the number of I/O lines, the robotic arm interface incorporates a serial in, parallel out (SIPO) integrated circuit, the 74LS164. By using just two lines off the parallel port, lines D0 and D1, to send serial information to the chip, we can add eight I/O lines. Although eight I/O lines are available off the 74LS164, the interface requires just five of those I/O lines. When serial information is transmitted into the 74LS164 chip, the parallel output of the chip shifts in response. If the outputs of the 74LS164 were directly connected to the transistors, the arm functions would switch on and off as the serial information clocked in. Obviously that would not be a suitable situation. To prevent this from happening, a second chip is added to the interface, the 74LS373 octal latch. The 74LS373 octal latch has eight input lines and eight output lines. Binary information placed on the input lines is transmitted (made transparent) to the output lines when the chip is enabled. When the chip is not enabled, the information on the output lines is latched. When latched, the binary information on the input lines has no effect on the status of the output lines. When all serial information has been transmitted into the chip, the 74LS373 octal latch is enabled, via parallel port pin D2. This allows the parallel information from the 74LS164 to be transmitted to the output lines of the 74LS373. The output lines from the 74LS373 switch the TIP 120 transistors on and off, thereby controlling the robotic arm functions. The process is repeated for each new com fifteen
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